Doxycycline Therapy Research Articles

Effect of Doxycycline in Decreasing the Severity of Clostridioides difficile Infection in Mice.

Background: Doxycycline possesses antibacterial activity against Clostridioides difficile and anti-inflammatory effects. Materials and Methods: The influence of doxycycline on the development of CDI was studied in an established animal model of CDI using C57BL/6 mice. Results: Mice intraperitoneally administered doxycycline had higher cecum weight (1.3 ± 0.1 vs. 0.5 ± 0.1 g; p < 0.001) and less body weight reduction (0.7 ± 0.5 g vs. −17.4 ± 0.2 g; p < 0.001) than untreated mice infected with C. difficile. Oral doxycycline, metronidazole, or vancomycin therapy resulted in less body weight reduction in mice with CDI than in untreated mice (1.1 ± 0.1 g, 1.3 ± 0.2 g, 1.2 ± 0.1 g, vs. 2.9 ± 0.3 g; p < 0.001). Doxycycline therapy led to lower expression levels of inflammatory cytokines, such as macrophage inflammatory protein-2 (0.4 ± 0.1 vs. 2.9 ± 1.3, p = 0.02), and higher levels of zonula occludens-1 (1.2 ± 0.1 vs. 0.8 ± 0.1, p = 0.02) in colonic tissues than in untreated mice. Conclusions: Concurrent intraperitoneal administration of doxycycline and oral C. difficile challenge does not aggravate the disease severity of CDI, and oral doxycycline may be a potential therapeutic option for CDI.

Challenges of repurposing tetracyclines for the treatment of Alzheimer's and Parkinson's disease.

The novel antibiotic-exploiting strategy in the treatment of Alzheimer's (AD) and Parkinson's (PD) disease has emerged as a potential breakthrough in the field. The research in animal AD/PD models provided evidence on the antiamyloidogenic, anti-inflammatory, antioxidant and antiapoptotic activity of tetracyclines, associated with cognitive improvement. The neuroprotective effects of minocycline and doxycycline in animals initiated investigation of their clinical efficacy in AD and PD patients which led to inconclusive results and additionally to insufficient safety data on a long-standing doxycycline and minocycline therapy in these patient populations. The safety issues should be considered in two levels; in AD/PD patients (particularly antibiotic-induced alteration of gut microbiota and its consequences), and as a world-wide threat of development of bacterial resistance to these antibiotics posed by a fact that AD and PD are widespread incurable diseases which require daily administered long-lasting antibiotic therapy. Recently proposed subantimicrobial doxycycline doses should be thoroughly explored for their effectiveness and long-term safety especially in AD/PD populations. Keeping in mind the antibacterial activity-related far-reaching undesirable effects both for the patients and globally, further work on repurposing these drugs for a long-standing therapy of AD/PD should consider the chemically modified tetracycline compounds tailored to lack antimicrobial but retain (or introduce) other activities effective against the AD/PD pathology. This strategy might reduce the risk of long-term therapy-related adverse effects (particularly gut-related ones) and development of bacterial resistance toward the tetracycline antibiotic agents but the therapeutic potential and desirable safety profile of such compounds in AD/PD patients need to be confirmed.

Pityriasis lichenoides et varioliformis acuta - dilemmas in diagnosis and choice of therapy: A case report

Introduction. Pityriasis lichenoides et varioliformis acuta is a rare inflammatory skin disease of unknown etiology and its diagnosis is sometimes established by eliminating diseases that are considered in the differential diagnosis. Given the lack of randomized clinical trials, recommendations for therapy remain based on case reports and case series. Case Report. We present a 63-year-old female patient with generalized skin lesions including, papules, papulonecrotic lesions, and atrophic scars accompanied by a subjective feeling of itching that occurred 2 months before admission. The histopathological findings showed a mixed perivascular inflammatory cellular infiltrate and capillary blood vessels with thickened walls in the superficial part of the dermis as signs of vasculitis. The infiltrate was dominated by lymphocytes, neutrophils were admixed, but there were no signs of cellular atypia, which supported the clinical diagnosis of pityriasis lichenoides et varioliformis acuta. Therapy with systemic corticosteroids and doxycycline was applied, which led to the resolution of lesions. Conclusion. The authors would like to bring to the readers? attention a rare skin disease, pityriasis lichenoides et varioliformis acuta, point to papulonecrotic tuberculids in differential diagnosis due to similar clinical presentation, remind them of the dilemmas that may arise in case of the described lymphocytic vasculitis based on the findings of histopathological analysis, and highlight the effectiveness of doxycycline and prednisone in the therapy.

The ‘other’ epidemic: canine ehrlichiosis in Australia

Canine monocytic ehrlichiosis (Ehrlichia canis infection) is a serious tick-transmitted disease of dogs that was considered exotic to Australia until recently. The disease was first reported across northern and central Australia in 2020, with significant canine morbidity and mortalities observed at indigenous communities where dog numbers are high, ticks are superabundant, and tick prevention is scant. The date and location of the incursion are unknown, yet comparative genomic analysis suggest the Australian E. canis may have originated from Asia or the Middle East. Veterinarians nationwide are on alert for this notifiable disease since cases have been reported in southern locations as a consequence of moving infected dogs from endemic areas. Acute infections in dogs respond favourably to doxycycline therapy, however chronic disease results in bone marrow failure and death. Tick prophylaxis is key to preventing canine ehrlichiosis and is best achieved using products that repel and kill ticks before they attach. Although reports exist of E. canis as a zoonosis, there is no evidence that the strain involved in the current Australian outbreak poses risk to humans.

Urticarial Bullous Pemphigoid: A New Case Report

Background: Bullous pemphigoid (BP) is the most common autoimmune bullous disease and it primarily affects the elderly population. It typically presents with tense bullae and severe pruritus. Non-bullous pemphigoid is a subtype of BP characterized by lacking the typical bullae formation with different presentations including erythematous, eczematous, urticarial, polycyclic, targetoid, nodular, lichenoid, vesicular and erythrodermic. Aim: to document a new case presentation of urticarial BP who was treated for several years as chronic urticarial and chronic eczema. Case Report: A 56-year-old male patient presented with a history of recurrent severely pruritic urticarial wheals for 4 years duration involving the lower abdomen, lower back, upper and lower extremities associated with excoriations, keratosis, and post-inflammatory hyperpigmentations on resolved sites, diagnosed as urticarial BP on histopathology & direct immunofluorescence study (DIF) and was improved on systemic doxycycline therapy. Conclusion: BP can be presented with atypical manifestation. Urticarial BP is a rare variant of non-bullous pemphigoid that should be taken into consideration in the differential diagnosis of an atypical urticarial wheal not responding to conventional therapy.

Emergence of “urban scrub typhus” during Monsoon season in an urban pocket and biodiversity hotspot of New Delhi, India

Introduction: Scrub typhus is an endemic disease transmitted within the “epidemiological tetrad” of rains, rodents, chigger mites, and scrub vegetation prevalent in “Tsutsugamushi Asia-Pacific triangle,” predisposing one billion population at risk and annual incidence of one million. Scrub typhus is difficult to differentiate clinically from coendemic vector-borne acute undifferentiated febrile illness (AUFI). Untreated scrub typhus may cause disseminated vasculitis, serositis, and hemophagocytic syndrome. Outbreaks of scrub typhus have been reported from Thailand, China, Korea, and rural India. Transmission of scrub typhus in urban areas is relatively rare. Three consequent outbreaks in a urban pocket in New Delhi, India, highlight emergence of urban scrub typhus. Materials and Methods: A cross-sectional, clinicoepidemiological, ambispective outcome surveillance study was conducted among all clinicodemographically homogenous patients presenting with AUFI during 2016–2018. Clinically suspected or intuitively investigated scrub typhus was screened by IgM/IgG immunochromatography and confirmed through IgM enzyme-linked immunosorbent assay and real-time polymerase chain reaction. Spatial, temporal, and vector surveillance through epidemiological mapping, line listing, and mite surveillance was done. Results: Scrub typhus outbreaks affected 161 patients during 2016–2018. Mean age was 31.77 ± 17 years. Most common clinical presentation was fever with headache. Eschar was present in 46.88% patients commonly on abdomen, chest, perineum, and extremities. Coinfections and comorbidities were seen in 3.75% and 14.37% patients, respectively. Seventy percent and 14.8% patients were managed in acute care and intensive care. Mean hospital stay was 8.96 ± 3.86 days. Doxycycline and doxycycline-azithromycin combination were given in 92.5% and 7.5% patients, respectively. All-cause mortality was 6.25%. 126/160 (78.75%) patients were geospatially distributed from urban landscape depicted in epidemiological maps. Temporal-seasonal distribution revealed bell-shaped curve from May to November. Mite carriage was seen in 16% rodents. Conclusion: Urban scrub typhus is emerging in microhabitats fulfilling the epidemiological tetrad and chigger mites undergoing transovarian transmission. Geospatial and temporal mapping are required in urban neighborhoods for risk stratification, outbreak management, vector control, and community education. A high index of suspicion in AUFI and early initiation of doxycycline therapy are required.

Acute cerebellar ataxia: a rare presentation of scrub typhus in pediatric age group

Scrub typhus is known to cause local and systemic vasculitic response in almost all the systems of the body. Scrub typhus very rarely presents itself with CNS manifestations. In central nervous system it most commonly causes meningitis and encephalitis although several other atypical presentations have been documented. Cerebellar ataxia, which is the lack of coordination, has a number of causes none of which are as uncommon or unheard of as Scrub Typhus. We report a case of a 15 years old child presenting with fever and isolated acute cerebellitis. Scrub Typhus was diagnosed by serum IgM ELISA. Patient showed rapid response to doxycycline therapy.

Clinical Effect of Doxycycline Combined with Compound Sulfamethoxazole and Rifampicin in the Treatment of Brucellosis Spondylitis

ObjectiveThe purpose of this study was to determine the clinical value of triple antibiotic therapy consisting of doxycycline, compound sulfamethoxazole and rifampicin in the treatment of brucellosis spondylitis.MethodsA retrospective analysis was performed on 100 patients with brucellosis spondylitis admitted to the First Affiliated Hospital of Hebei North University from March 2016 to June 2019. Patients were divided into the following two groups: the control group (n = 50) treated with dual antibiotic therapy (rifampicin + compound sulfamethoxazole), and the observation group (n = 50) treated with triple antibiotic therapy (rifampicin + doxycycline + compound sulfamethoxazole). The treatment effect, low back pain relief, levels of erythrocyte sedimentation rate (ESR), procalcitonin (PCT) and C-reactive protein (CRP), as well as the adverse reactions were compared between the two groups.ResultsThe response rate of the observation group was significantly higher than that of the control group (P < 0.05). Before treatment, there was no significant difference in the low back pain assessed by the visual analogue scale (VAS), or levels of ESR, PCT and CRP between the two groups (P > 0.05). But after treatment, the VAS score and the levels of ESR, PCT and CRP in observation group were lower than those in the control group (P < 0.05). No significant difference was found in the incidence of adverse reactions (P > 0.05).ConclusionThe triple antibiotic therapy of doxycycline, compound sulfamethoxazole and rifampicin is effective in the treatment of brucellosis spondylitis. It can significantly alleviate patients’ back pain and inflammation with a high safety profile, which is worthy of clinical application.

The effect of doxycycline on abdominal aortic aneurysm growth: a meta-analysis

Abstract Introduction There have been many studies on the benefits of chronic doxycycline therapy on slowing down the rate of abdominal aortic aneurysm (AAA) expansion by decreasing matrix metalloproteinase (MMPs) levels in AAA, known contributors to AAA growth. However, there have been few studies performed on the clinical effect of doxycycline on reducing the rate of AAA expansion. Purpose The objective of this meta-analysis was to evaluate the effect of doxycycline on the expansion of AAA. Methods We performed a comprehensive literature search using PubMed, Embase, and Cochrane Libraries from inception to October 2020 for all studies evaluating the effect of chronic doxycycline therapy on AAA growth. The primary outcome was the effect doxycycline therapy on AAA growth rate compared to the placebo. The mean difference and 95% confidence intervals (CI) were obtained by the Inverse Variance method within a random effect model. Results A total of three randomized control trials (485 total patients) were included in the final analysis. The analysis showed that there was no significant benefit of chronic doxycycline therapy in reducing AAA dilation rate compared to placebo [Mean difference of 0.03; 95% CI −0.05 to 0.11, P=0.43, I2=90%]. Conclusion This is the first meta-analysis evaluating the effects of chronic doxycycline therapy on the growth rate of AAAs. The current data suggests that there is no significant decrease in rate of expansion of AAA diameter in patients treated with chronic doxycycline vs. placebo. Funding Acknowledgement Type of funding sources: None.

Lyme Carditis With Complete Heart Block Successfully Treated With Oral Doxycycline.

Lyme disease is a vector-borne infection that can affect multiple different organ systems. Lyme carditis represents one of these sequelae and is defined by acute onset of high-grade atrioventricular block in the presence of laboratory-confirmed infection. Current guidelines recommend patients with Lyme carditis be admitted for close cardiac monitoring and intravenous antibiotics therapy. Our case illustrates an active duty male who was initially diagnosed with Lyme disease after initially reporting symptoms including headache, fever, eye pain, and rash, with subsequent development of exercise intolerance 6 weeks later. An electrocardiogram (ECG) obtained at that time was misinterpreted as first-degree heart block, and he was initiated on oral doxycycline therapy and referred to cardiology. On follow-up to cardiology clinic, the prior ECG was reviewed and interpreted as complete heart block. A repeat ECG showed resolution of the heart block, and exercise stress testing showed chronotropic competence. This case illustrates the resolution of complete heart block in Lyme carditis with oral doxycycline, suggesting this antibiotic as a possible alternative treatment agent.

Disease Modifying Treatment of Osteoarthritis with Triple Combination Anti-Microbial Therapy

Background: The study author, while still a medical student, observed microscopic evidence of chronic inflammation in joint tissue of patients suffering with osteoarthritis and hypothesized that osteoarthritis was caused by an infectious process. After graduating from medical school and entering into private practice, the study author had several patients who informed him that when they were on tetracycline therapy, for reasons other than arthritis, their arthritis symptoms diminished to some extent. After reporting improvement of arthritic symptoms with tetracycline, one of these patients subsequently received metronidazole and while taking both tetracycline and metronidazole reported that his arthritic symptoms improved to an even greater extent, as his joint pain further diminished but did not resolve. Subsequent treatment of osteoarthritis in other patients included the combination of tetracycline, metronidazole, other antibiotics and some natural products but only when L-lysine was added to the tetracycline and metronidazole combination therapy did the author observe yet further improvement in arthritic pain. Since L-lysine was reported to inhibit the growth of herpes simplex virus, the author and another colleague concluded that acyclovir might be a beneficial addition to the tetracycline, metronidazole, L-lysine combination. This four-component combination treatment resulted in total resolution or a marked diminution of osteoarthritis joint pain, joint tenderness and joint stiffness in most patients treated. It was further determined that L-lysine could be eliminated; that acyclovir could be replaced with valicyclovir; and that tetracycline could be replaced with minocycline or doxycycline.&#x0D; Preliminary studies of patients diagnosed with osteoarthritis and treated with tetracycline alone or the combination of tetracycline and metronidazole demonstrated improvement in their osteoarthritic symptoms. However the triple combination of doxycycline (broad spectrum antibiotic), metronidazole (antiprotozoal and antibacterial imidazole) and acyclovir (antiviral purine nucleoside) administered orally twice daily for eight weeks showed marked success in a group of patients suffering with osteoarthritis by substantially eliminating their joint pain, joint tenderness and joint stiffness while overcoming their fatigue and increasing their energy level. The data in this report substantiate that this triple combination is a disease modifying therapy that eliminates or markedly diminishes the symptomatology of osteoarthritis and further supports the hypothesis that osteoarthritis is an infectious disease. Objective: To evaluate the effect of the triple combination therapy of doxycycline, metronidazole, and acyclovir on the joint pain, joint stiffness and functionality in patients suffering with osteoarthritis. Design: Non-blinded study of treatment of patients suffering with osteoarthritis Setting: Primary care internal medicine practice in Alameda County, California. Sample: Six adult individuals suffering with osteoarthritis. Patients: Six patients, ages 53 through 82 years. Patient 1 was treated for 28 days and Patients 2 through 6 were treated for 56 days. Method: After obtaining informed consent, six patients suffering with osteoarthritis were prescribed a 56 day course of treatment with the triple combination of doxycycline, metronidazole, and acyclovir for treatment of their osteoarthritis. Utilizing the WOMAC index for assessment of the effectiveness of treatment of osteoarthritis, pre-treatment pain, stiffness and functional limitation, were compared to post-treatment pain, stiffness and functional limitations. Results: Three patients demonstrated total resolution of pain and stiffness and greater than 95% improvement in functional limitations. One of the remaining three patients demonstrated a 70% improvement in pain, total resolution of stiffness, and an 85% improvement in functional limitations; another one of the three remaining patients demonstrated an 86% improvement in pain, total resolution of stiffness, and a 79% improvement in functional limitations; while the last of the three remaining patients demonstrated at least an 85% improvement in pain, 67% improvement in stiffness, and a 63% improvement in functional limitations.&#x0D; Limitations: No randomization. No placebo. No control group. Small sample size. Conclusion: The results of treatment of these patients suffering the osteoarthritis support the hypothesis that osteoarthritis is an infectious disease. These results further suggest that osteoarthritis is, at a minimum, modifiable with the triple combination therapy of doxycycline, metronidazole, and acyclovir and is even curative of with this breakthrough treatment in many cases. The medical treatment reported in this article represents the first truly Disease Modifying medication therapy developed for osteoarthritis. &#x0D; Keywords: WOMAC index

Prurigo pigmentosa: a case with rapid response to doxycycline and the likely pathogenetic role of neutrophils

Prurigo pigmentosa is a rare pruritic dermatosis, characterized by the development of early papulo-pustules that subsequently evolves into reticulate pigmentation. It is commonly misdiagnosed or undiagnosed, as it presents as a dynamic process, with clinical and histologic presentations that vary according to the stages of development at different time points. To date, the underlying etiology is still unknown. It has been widely reported to be nonresponsive to antihistamine or topical corticosteroid therapy. We describe a patient with prurigo pigmentosa who demonstrated significant response to oral doxycycline therapy, with no subsequent recurrence. The rapid and marked response to treatment with antibiotics, especially tetracyclines, being antineutrophilic, suggests the important role of neutrophils in the underlying inflammatory process.

Use of Doxycycline in a Renal Impaired Patient with Enteroccocal Sepsis

Aim: This report highlights the use of doxycycline therapy other than the more standard regimen that includes an aminoglycoside in the management of enterococcal infection in patients with renal impairment without causing further damages to the kidney due to aminoglycoside therapy.&#x0D; Presentation of Case: A case of enteroccocal septicemia in a 29-year-old woman who was admitted on account of acute kidney injury secondary to pregnancy induced hypertension in the setting of pre-eclampsia. She was referred from another centre where she had emergency caesarean section done on account of severe pre-eclampsia at 36 weeks gestational age. Blood culture yielded Enterococcus species. When other antibiotic regimen failed, she was started on doxycycline. Patient had good clinical response and was discharged 7 days after commencement of doxycycline.&#x0D; Discussion: Enteroccoci have emerged as important agent of human disease largely because of their resistance to antimicrobial agents. They are important nosocomial pathogens capable of causing serious and potentially life-threatening infections, including sepsis. The incidence of enteroccocal infections, mainly hospital-acquired, has increased over the past 2 decades and isolates with novel mechanism of resistance to antimicrobial agents are more and more frequent. Furthermore, they have great capacity for transmitting these resistances to other species and even to other genera.&#x0D; Conclusion: Doxycycline is a safe and effective alternative antibiotic for the treatment of enterococcal sepsis in patients with impaired renal status.

A comparative study on ivermectin- doxycycline and favipiravir therapy in COVID19 patients

Objectives: We investigated the outcomes of Ivermectin-Doxycycline vs. Favipiravir therapy in mild to moderate COVID19 patients.Methods: Patients were divided randomly into two groups: Ivermectin 200µgm/kg single dose + Doxycycline 100mg BID for ten days in group A, and Favipiravir 1800mg for the first day, then 800mg BID for six days in group B (Control group). RT-PCR for SARS-CoV-2 infection was repeated in all symptomatic patients on the second day onward without symptoms. Repeat PCR was done every two days onward if the result found positive. Time to the negative PCR and symptomatic recovery was measured for each group. Results: All subjects in Group A reached a negative PCR, at a mean of 8.93 days, and reached symptomatic recovery, at a mean of 5.93 days, with 55.10% symptom-free by the fifth day. In group B, 96.36% reached a negative PCR at a mean of 9.33 days and were symptoms-free at 6.99 days. In group a 31.67% of patients expressed symptoms caused by medication, this was 46.43% in group B. Conclusion: The combination therapy of Ivermectin-Doxycycline showed a trend towards superiority to the combination of Favipiravir for mild to moderate COVID19 disease.

Small joint polyarthritis – An unusual presentation of scrub typhus in a child

Scrub typhus is a common Rickettsial infection which is endemic in tropical regions. It is characterised by fever, eschar, thrombocytopenia, lymphadenopathy and organomegaly. Scrub typhus has significant morbidity and mortality owing to its multisystemic involvement. Non-inflammatory polyarthritis of small joints is an uncommon presentation in paediatric scrub typhus. We discuss a five-year-old boy who presented with fever, small joint polyarthritis, hepatosplenomegaly and pathognomonic eschar with positive scrub IgM ELISA. Arthritis resolved completely with doxycycline therapy without any deformity.

Doxycycline Therapy for Abdominal Aortic Aneurysm: Inhibitory Effect on Matrix Metalloproteinases.

Abdominal aortic aneurysm (AAA) is a life-threatening condition associated with smoking, aging, atherosclerosis, and destruction of the connective tissue in the abdominal aortic wall. Disturbances in the synthesis and degradation of matrix metalloproteinase (MMP) have been known to contribute to the development of AAAs. The only available treatment of AAA is surgical repair. Doxycycline, a tetracycline analog, is thought to have an inhibitory effect on MMPs. Knowing the effect of doxycycline, there may be some favorable effects of the drug to reduce the growth of small AAAs and avoid the need for invasive treatment. This article aims to determine the relationship between doxycycline and the MMPs to prevent the growth of small AAAs. We conducted our review using online resources such as PubMed, Google Scholar, The Journal of Vascular Surgery, and ResearchGate. The result of our study supports the effect of doxycycline in preventing the growth of small AAAs. We conclude that therapeutic treatment with doxycycline in patients with small AAAs can prevent the growth of aneurysms, life-threatening aneurysm rupture, and reduce the need for expensive, invasive treatment.

Splenic Abscess

Background: Scrub typhus is endemic in the various parts of the world and especially in the Indian subcontinent. Splenic infarcts and abscess are largely unknown in scrub typhus. These can be a source of persistent abdominal pain in the left hypochondriac region. Clinical Description: A 9-year-old child presented with a 7-day history of fever, loose stools, respiratory distress, and abdominal pain. On examination, she was febrile, had tachypnea, tachycardia, pallor, and facial puffiness. Systemic examination showed pleural effusion and hepatomegaly. Acute febrile illness with third spacing led to differentials of tropical infections (dengue, scrub typhus, enteric fever, and malaria). Management: Dengue, enteric fever, and malaria were ruled out on investigations. Scrub IgM enzyme-linked immunosorbent assay was positive. Ultrasound of the abdomen showed multiple splenic anechoic lesions suggestive of abscesses. Contrast-enhanced computed tomography (CT) confirmed the findings. Ultrasonography-guided aspiration of the lesion revealed blood-stained pus. The gram stain was negative, and culture was sterile. The final diagnosis was scrub typhus with splenic abscess. Her symptoms resolved with doxycycline therapy. Conclusion: Involvement of the spleen resulting in infarct and abscess is a rare complication in scrub typhus and can lead to persisting abdominal symptoms. Splenic infarction is not a well-known complication in patients of scrub typhus; hence, it may lead to under diagnosis of the condition. An abdominal ultrasound or if required, CT scan of the abdomen might be needed in cases with persistent abdominal symptoms to rule out this rare complication.

Sequential doxycycline and colchicine combination therapy in Covid-19: The salutary effects

Coronavirus virus disease 2019 (COVID-19) is a viral infectious disease caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), actually considered as a global pandemic. The entry-point for SARS-CoV-2 is angiotensin converting enzyme 2 (ACE2) and dipeptidyl peptidase 4 (DPP4), which are highly expressed in the lung. Among other complications, COVID-19leads to fatal pneumonia, acute lung injury (ALI) and acute respiratory distress syndrome (ARDS) due to development of cytokine storm (CS). The pathogenesis of SARS-CoV-2 infection depends on the viral load and human innate/adaptive immune response that are required for viral elimination in the first phase of COVID-19. However, an exaggerated immune response in the second phase of COVID-19 results in immune overreaction and CS-induced ALI and ARDS. Thus, in view of these considerations, we report here a series of five patients with COVID-19 pneumonia who developed ALI. In addition to the supportive therapy, the patients received doxycycline in the first week and doxycycline plus colchicine in the second week. Following sequential therapy with doxycycline and/or colchicine in patients with COVID-19 pneumonia, the patients had reduction of disease severity and symptoms with better clinical and radiological outcomes. However, it is tough to confirm the link between this therapeutic combination and recovery from COVID-19 pneumonia, as it is a small case-series report. Nevertheless, this study gives a rational for large-scale prospective studies to evaluate the dual sequential effect of doxycycline and colchicine on the COVID-19 severity. This case-series illustrated that use of colchicine: doxycycline combination is linked with marked improvements in the clinical, laboratory and radiological outcomes in patients with COVID-19 pneumonia. However, we cannot sketch any definitive conclusion from our observation, despite we hypothesize that this combination therapeutic regimen may attenuate and treat COVID-19. Further, namely prospective, randomized, and controlled clinical studies are recommended in this regard.

Clinical and Microbiological Evaluation of Local Doxycycline and Antimicrobial Photodynamic Therapy during Supportive Periodontal Therapy: A Randomized Clinical Trial.

The aim of this study was to evaluate the clinical and microbiological effects of subgingival instrumentation (SI) alone or combined with either local drug delivery (LDD) or photodynamic therapy (PDT) in persistent/recurrent pockets in patients enrolled in supportive periodontal therapy (SPT). A total of 105 patients enrolled in SPT were randomly treated as follows: group A (n = 35): SI +PDT and 7 days later 2nd PDT; group B (n = 35): SI+LDD; group C (n = 35): SI (control). Prior intervention, at 3 and 6 months after therapy, probing pocket depths, clinical attachment level, number of treated sites with bleeding on probing (n BOP), full mouth plaque and bleeding scores (gingival bleeding index, %BOP) were recorded. At the same time points, 8 periodontopathogens were quantitatively determined. All three treatments resulted in statistically significant improvements (p < 0.05) of all clinical parameters without statistically significant intergroup differences (p > 0.05). Several bacterial species were reduced in both test groups, with statistically significantly higher reductions for LDD compared to PDT and the control group. In conclusion, the present data indicate that: (a) In periodontal patients enrolled in SPT, treatment of persistent/recurrent pockets with SI alone or combined with either PDT or LDD may lead to comparable clinical improvements and (b) the adjunctive use of LDD appears to provide better microbiological improvements for some periodontal pathogens than SI alone or combined with PDT.

Combination effect of laser diode for photodynamic therapy with doxycycline on a wistar rat model of periodontitis

BackgroundPeriodontitis is a chronic inflammatory disease characterized by progressive damage on the structure of tooth-supporting tissues. The aim of the study is determining the combination photodynamic effect of diode laser 405 nm treatments and the administration of doxycycline 0.1% within 1, 3, 5, and 7 days on a Wistar rat model of periodontitis.MethodsSamples were induced with Porphyromonas gingivalis ATCC33277 to allow periodontitis development and were treated with combination of doxycycline and laser diode, then statistical analysis was carried out (One-Way ANOVA test and the post-hoc Duncan test; Kruskal–Wallis test and Mann–Whitney follow-up test for non-parametric data). Samples were divided into five groups, laser exposure used was 405-nm diode laser with energy density of 8 J/cm2. The expression level of histomorphometric was calculated by measuring the number of macrophages, lymphocytes, fibroblasts and the distance between the CEJ-AV.ResultsThe results showed that the combination treatment of doxycycline and laser exposure yielded immunomodulatory effects. The expression level of fibroblast and the distance between CEJ-AV bone showed that the combination of doxycycline and laser therapy exerted healing effect in rat models of periodontitis on day 5 and 7.ConclusionThe combination of doxycycline 0.1% and diode laser therapy provides a healing effect in rats models of periodontitis.