Patients In Jamaica Research Articles

Graham Serjeant, Sickle Cell, Jamaica and Beyond: A Life, Ian Randle Publishers (Kingston and Miami), 2021

Graham Serjeant, Sickle Cell, Jamaica and Beyond: A Life, Ian Randle Publishers (Kingston and Miami), 2021

Selective cytotoxic and anti-metastatic activity in DU-145 prostate cancer cells induced by Annona muricata L. bark extract and phytochemical, annonacin

BackgroundAnnona muricata L. was identified as a popular medicinal plant in treatment regimens among cancer patients in Jamaica by a previously conducted structured questionnaire. Ethnomedically used plant parts, were examined in this study against human prostate cancer cells for the first time and mechanisms of action elucidated for the most potent of them, along with the active phytochemical, annonacin.MethodsNine extracts of varying polarity from the leaves and bark of A. muricata were assessed initially for cytotoxicity using the MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) assay on PC-3 prostate cancer cells and the ethyl acetate bark (EAB) extract was identified as the most potent. EAB extract was then standardized for annonacin content using High-performance Liquid Chromatography - Mass Spectrometry (HPLC-MS) and shown to be effective against a second prostate cancer cell line (DU-145) also. The mode of cell death in DU-145 cells were assessed via several apoptotic assays including induction of increased reactive oxygen species (ROS) production, reduction of mitochondrial membrane potential, activation of caspases and annexin V externalization combined with morphological observations using confocal microscopy. In addition, the potential to prevent metastasis was examined via inhibition of cell migration, vascular endothelial growth factor (VEGF) and angiogenesis using the chorioallantoic membrane assay (CAM).ResultsAnnonacin and EAB extract displayed selective and potent cytotoxicity against the DU-145 prostate carcinoma cells with IC50 values of 0.1 ± 0.07 μM and 55.501 ± 0.55 μg/mL respectively, without impacting RWPE-1 normal prostate cells, in stark contrast to chemotherapeutic docetaxel which lacked such selectivity. Docetaxel’s impact on the cancerous DU-145 was improved by 50% when used in combination with EAB extract. Insignificant levels of intracellular ROS content, depolarization of mitochondrial membrane, Caspase 3/7 activation, annexin V content, along with stained morphological evaluations, pointed to a non-apoptotic mode of cell death. The extract at 50 μg/mL deterred cell migration in the wound-healing assay, while inhibition of angiogenesis was displayed in the CAM and VEGF inhibition assays for both EAB (100 μg /mL) and annonacin (0.5 μM).ConclusionsTaken together, the standardized EAB extract and annonacin appear to induce selective and potent cell death via a necrotic pathway in DU-145 cells, while also preventing cell migration and angiogenesis, which warrant further examinations for mechanistic insights and validity in-vivo.

Elevated blood pressure and illness beliefs: a cross-sectional study of emergency department patients in Jamaica

BackgroundElevated blood pressure (BP) is common among emergency department (ED) patients. While some data exist on the association between ED BP and hypertension (HTN) in the USA, little is known about this relationship in Afro-Caribbean nations. The aim of the study was to evaluate the relationship between elevated systolic BP in the ED and a previous diagnosis of HTN, accounting for potential factors that could contribute to poor HTN control among those with a previous diagnosis: socioeconomic status, health-seeking behavior, underlying HTN illness beliefs, medication adherence, and perceived adherence self-efficacy.MethodsThis was a cross-sectional survey over 6 weeks, from November 19 through December 30, 2014. Those surveyed were non-critically ill or injured adult ED patients (≥ 18 years) presenting to an Afro-Caribbean hospital. Descriptive statistics were derived for study patients as a whole, by HTN history and by presenting BP subgroup (with systolic BP ≥ 140 mmHg considered elevated). Data between groups were compared using chi-square and t tests, where appropriate.ResultsA total of 307 patients were included: 145 (47.2%) had a prior history of HTN, 126 (41.4%) had elevated BP, and 89 (61.4%) of those presenting with elevated blood pressure had a previous diagnosis of HTN. Those with less formal education were significantly more likely to present with elevated BP (52.1 vs. 28.8% for those with some high school and 19.2% for those with a college education; p = 0.001). Among those with a history of HTN, only 56 (30.9%) had a normal presenting BP. Those with a history of HTN and normal ED presenting BP were no different from patients with elevated BP when comparing the in duration of HTN, medication compliance, location of usual follow-up care, and HTN-specific illness beliefs.ConclusionsIn this single-center study, two out of every five Jamaican ED patients had elevated presenting BP, the majority of whom had a previous diagnosis of HTN. Among those with a history of HTN, 60% had an elevated presenting BP. The ED can be an important location to identify patients with chronic disease in need of greater disease-specific education. Further studies should evaluate if brief interventions provided by ED medical staff improve HTN control in this patient population.

Glycemic Index in the Development of Functional Beverage

Background: Due to the prevalence of diabetes in Jamaica, an understanding of the glycemic index (GI) and glycemic load (GL) values of beverages and food can aid dieticians in guiding consumers to choose sensibly. It is reported that consumption of low GI and GL foods may reduce the risk of type 2 diabetes, coronary heart disease and obesity. However, low GI snacks/food available to diabetic patients in Jamaica are very limited. This study was conducted to develop a low GI and GL vegetable drink that could be commercialized. Methods: Ten (10) healthy Jamaican subjects (5 males and 5 females) with mean age 30 ± 2 years and mean BMI 25 ± 1 kg/m2 were recruited to the study. Using a non-blind, crossover design trial, the subjects consumed equicarbohydrate amounts (25 g of total available carbohydrate) of the vegetable (beetroot – Beta vulgaris, cucumber – Cucumis sativus and carrot – Daucus carota) drink and twice glucose as reference food (25 g of total carbohydrate). Blood glucose was determined after overnight fasting (0 hours) and at 15, 30, 45, 60, 90 and 120 minutes after the consumption of each test food. The glycemic index (GI) value was calculated geometrically by expressing the incremental area under the blood glucose curve (IAUC) as a percentage of each subject's average IAUC for the standard food. Results: The GI and GL values of the vegetable drink were found to be 34 ± 10 and 4.4, respectively. As per the Food and Agriculture Organization, GI cut-off values are as follows: low 70 and for GL, low ≤ 10, medium 10 to 20 or high ≥ 20. Hence the vegetable drink could be classified under low glycemic food/ nutrient. Conclusion: Identification of beverages and other foods with low glycemic responses may have practical applications in controlling blood glucose levels. This study provides scientific evidence of the blood glucose response of the formulated vegetable drink. The complex carbohydrates in beetroot, carrot and cucumber may be responsible for the low postprandial glycemic response. This will lead to a low demand for insulin secretion from the pancreatic β cells, which are often impaired in type 2 diabetic individuals.

Reliance on medicinal plant therapy among cancer patients in Jamaica.

Patients' perspective of their treatment regime plays a vital role in its success. Recognizing the high prevalence of medicinal plant usage among Jamaicans at large, we investigated the engagement of such remedies by cancer patients, with the aim of uncovering self-medicating habits, perceptions and details of utilized plants. A structured, interviewer-based questionnaire was administered to 100 patients attending the oncology and urology clinics at the University Hospital of the West Indies in Kingston, Jamaica. A method of convenience sampling was employed and the data were analyzed using summary statistics and statistical significance tests. A large proportion (n=80, 80%) of interviewed patients, engaged medicinal plants in their treatment regimes. Such habits were independent of person's education, economic status and were higher among the 55-74 age groups (p<0.05) compared with younger patients. The use of herbs was hinged on the patient's strong sense of tradition and positive perspective of herbal efficacy (88%), fueled by anecdotal accountsfrom fellow patients. Majority of such users (74.7%) were under concomitant treatment with a prescription medicine, and worryingly, only 15% of patients made their oncologists aware. Annona muricata L. and Petiveria alliacea L. were the most commonly used plants for treating breast and prostate cancers, respectively. A large proportion of Jamaican cancer patients use medicinal plants in self-medicating practices and their perceptions and habits need to be considered by physicians, in the design of safe and effective care regimes.

A high frequency of PALB2 mutations in Jamaican patients with breast cancer

Jamaica is an island nation with one of the highest breast cancer incidence rates in the Caribbean (40/100,000 per year). The contribution of cancer susceptibility gene mutations to the burden of breast cancer in Jamaica has not yet been explored. We sought to determine the prevalence of germline mutations in BRCA1, BRCA2, and PALB2 in 179 unselected Jamaican women with breast cancer. We sequenced the entire coding regions of BRCA1, BRCA2, and PALB2 for all the study subjects. Overall, 8 of 179 patients (4.5%) had a mutation in one of the three genes: one in BRCA1, two in BRCA2, and five in PALB2. These data suggest that in addition to BRCA1 and BRCA2, PALB2 should be included in genetic testing for breast cancer patients in Jamaica.

HIV-1 drug resistance in treatment-naive chronically infected patients in Jamaica.

HIV-1 drug resistance in treatment-naive patients has a significant impact on the individual patient as well as implications for the wider population. These effects are amplified in the context of resource-limited settings, which are rapidly expanding access to antiretroviral therapy. This cross-sectional survey at a single treatment site in Kingston, Jamaica was designed to identify the prevalence of HIV-1 drug-resistant mutations in chronically infected, treatment-naive patients. Mutations were identified using the Stanford HIV database algorithm and the World Health Organization (WHO) HIV Drug Resistance (HIVDR) surveillance mutations. The inclusion of 103 cases in the study resulted in 79 (76.6%) amplifiable samples. Genotype analysis revealed that 12.6% (95% CI 5.3, 19.9) were identified as having clinically significant mutations, while 10.1% (95% CI 3.5, 16.7) had WHO HIVDR surveillance mutations. According to the WHO standard, this study population has a moderate level of HIVDR in treatment-naive patients and strongly implies the need to introduce HIVDR surveillance in Jamaica.

Establishing the Jamaica Lupus Registry: Report of Patients with Systemic Lupus Erythematosus Attending a Major Referral Hospital in Jamaica

Systemic lupus erythematosus (SLE) is an autoimmune disorder characterized by multisystem microvascular inflammation with the generation of autoantibodies. There are reports on demographic data and clinical manifestation of lupus in the United States of America and some other developed countries. There is a single study that has reported on the clinical and immunological features of SLE patients in Jamaica and another that reported that the prevalence of SLE in Jamaica was 5-17/100,000 in 1979. A Jamaican lupus registry was established in 2008 at the Department of Medicine, The University of the West Indies. Data were collected using patient records and interview of patients fulfilling the American College of Rheumatology revised diagnostic criteria for SLE. Information on demographics, presence of diagnostic criteria for SLE, presence of complications and other clinical parameters were collected. There were a total of 107 patients that met the criteria for diagnosis of SLE at the referral centre, 96.3% of them female. Positive ANA (90.7%), arthritis (70.0%), malar rash (53.5%) and a positive dsDNA (40.1%) were the more frequent manifestations and diagnostic indices of the disease. Up to 41.7% of the SLE population suffered some form of complication. The initiation of a lupus registry has allowed for reporting ofpreliminary demographic, clinical and serological data and identifying of disease burden.

Medication compliance among mentally Ill patients in public clinics in Kingston and St. Andrew, Jamaica

The Bellevue and the Hagley Park mental health outpatient clinics in Jamaica serve the majority of psychiatric patients in the country, but there is a dearth of research on medication compliance, which is a very important mental health issue. Medication compliance affects intervention outcomes. Therefore, this study seeks to examine medication compliance among psychiatric patients in Jamaica. A 33-item questionnaire which included items on demographics, health conditions, medication compliance and insightfulness was administered to a sample of 370 participants with a response rate of 93%. The majority of the participants have schizophrenia, followed by depression, bipolar disorder and drug-induced psychosis. The majority of the participants (65.3%) did not comply with their prescribed medication regimen. Medication compliance was significantly related to: gender (P < 0.05) where males were more likely to take the prescribed medication, family support (P < 0.05) where the participants who received family support (the majority being males) were more likely to take the prescribed medication, and insightfulness (P < 0.05) where the majority of participants with insightfulness were females. Locus on control was not statistically tested but a majority of the non- compliant participants reported that factors external to themselves had greater control over their disorder. Conclusion: There are three significant factors that explain the medication compliance of psychiatric patients in Jamaica. An important non-tested factor is locus of control so there needs to be more research to understand the range of factors that can inform and improve patient education about medication compliance.

Dyslipidaemia in hypertensive obese type 2 diabetic patients in Jamaica

IntroductionHypertension and obesity are common problems among diabetic patients accelerating progression of vascular diabetic complications.Materials and methodsA two-stage stratified random sampling design was used, and individuals aged 15 years and over were interviewed. This cross-sectional study evaluated lipid abnormalities of 117 obese type 2 diabetic patients (28 males and 89 females), and 56 hypertensive obese type 2 diabetic patients (22 males and 34 females). Total cholesterol (TC), triglycerides (TG), low-density lipoprotein cholesterol (LDL-C), very-low-density lipoprotein cholesterol (VLDL-C) and high-density lipoprotein cholesterol (HDL-C) concentrations were assayed using standard biochemical methods.ResultsHypertensive obese type 2 diabetic females had significantly higher mean serum concentrations of TC (p = 0.043), TG (p = 0.046), LDL-C (p= 0.040), TC/HDL-C ratio (p = 0.001) and LDL-C/HDL-C ratio (p = 0.003) compared with hypertensive obese non-diabetic females. Similar results were found in hypertensive obese type 2 diabetic males compared with hypertensive obese non-diabetic males. Hypertensive obese type 2 diabetic females had significantly higher serum TC, TG and TC/HDL-C ratio (p < 0.05) than hypertensive obese type 2 diabetic males. Hypertensive obese type 2 diabetic females had significantly higher mean serum concentrations of TG (p = 0.03) and TC (p = 0.01) than obese type 2 diabetic females. There was a significant association between blood glucose and LDL-C concentrations in type 2 diabetic subjects (r = 0.36; p< 0.05).ConclusionObese hypertensive type 2 diabetic females are exposed more profoundly to risk factors including atherogenic dyslipidaemia compared with males.

The prevalence of other sexually transmitted infections in confirmed HIV cases at a referral clinic in Jamaica

Jamaica has the second highest number of acquired immunodeficiency syndrome (AIDS) cases and deaths in the Caribbean and a significant number of human immunodeficiency virus (HIV) infected individuals have a concomitant sexually transmitted infection (STI). The study determined the prevalence of non-ulcerative and ulcerative STIs and their association with sexual risky behaviour in a sample of HIV seropositive men and women. This study was conducted at the Comprehensive Health Centre in Jamaica, a sexually transmitted infection referral centre. The sample comprised 138 men and 132 women age 15-49 years, of average 29.5 years. The study was retrospective, from 2000 to 2002, and sample collection was randomized. The sexual behaviours of the subjects were assessed from the case records. In the 270 HIV diagnosed cases examined, the prevalence of STIs was 51.1% in men and 48.9% in women, with 85.4% having one or more STIs with an average of four STIs per patient. There was a total occurrence of 744 STIs with non-gonococcal urethritis (19.4%), gonorrhoea (17.2%), candidiasis (13.4%), trichomonas (12.4%), genital ulcer (10.4%) and syphilis (7.3%) the most common in HIV infected men and women. The presence of STI was associated with continued practice of risky sexual behaviour. The age group most implicated was the 30-34 year old, and 73.1% of the HIV infected patients had multiple sexual partners with only 16.4% reporting frequent condom use. The study demonstrates that there is a high prevalence of non-ulcerative and to a lesser extent ulcerative STIs in HIV infected patients in Jamaica. There are significant associations between STIs and continued high risk sexual practices in HIV infected men and women. The findings support the need for implementation of effective diagnosis and treatment strategies coupled with education about safe-sex practices in HIV prevention and STI control programmes.

Inter-hospital transfer of trauma patients in a developing country: A prospective descriptive study

There is no standardised protocol for the transfer of injured patients in Jamaica, a process that is well known to be potentially hazardous. We undertook this study to evaluate the inter-hospital transfer process of injured patients in this developing country. Materials and methods A prospective descriptive analytical study of all consecutive patients transferred to the University Hospital of the West Indies from other hospitals was conducted over six months. Data were collected on specially designed proformas and analysed using SPSS version 10.0. Results Of 122 patients studied, 79.5% were male and the mean age was 27.8 ± 20.7 years. Most injuries resulted from road traffic accidents (40.2%), falls (27.1%) and assaults (26.2%). Several problems with the transfer process were identified. There was poor documentation of clinical parameters at referring institutions, with records of pulse rates in 13.1% (16/122), blood pressure in 9.8% (12/122), respiratory rate in 9.8% (12/122), Glasgow Coma Score in 10.6% (13/122) and pupillary reaction in 4.9% (6/122) of cases. Transfer arrangements were made by junior medical officers in 93.4% (114/122) of cases while consultants requested only 3.3% (4/122) of transfers. Public hospital ambulances transported 91.8% (112/122) of patients and 7.4% (9/122) were transported by helicopter. These vehicles were equipped with facilities for oxygen administration in 99.2% (121/122) of cases and sphygmomanometers in 91% (111/122) of cases, but functional capacity for suction was only present in 50% of vehicles. These critically ill patients were accompanied by physicians in only 11.5% (14/122) of cases, while 68.9% (84/122) were accompanied only by nurses. Conclusions The transfer of injured patients is not being performed in a manner consistent with modern medical practice. There is urgent need for implementation of a standardised protocol for the transfer of such patients in Jamaica.

The aetiology aspects of head injury in admitted patients in Jamaica

This cross-sectional, descriptive study identified 857 head-injured patients who were admitted to the University Hospital of the West Indies (UHWI) over a four-year period. Their median age (IQR) was 28 (16, 45) years and 629 (73.5%) were males. Median length of hospital stay (IQR) was 2 (1, 6) days. Median ICU stay in the intensive care unit (IQR) was 6 (2, 12) days for the 59 (6.9%) patients admitted there. Most patients (73.3%) were admitted with unintentional injuries resulting from road traffic accidents (48.9%), of which passengers were the most commonly affected, and from falls which occurred in 24.4%. Intentional injuries accounted for 26.7% of those admitted, consisting mainly of assaults with blunt objects in 18.0% (154/857). Penetrating injuries were less common, accounting for 67 (7.8%) injuries. Among these, there were 23 gunshot wounds of the head (2.7%). Head injury in admitted patients is mainly due to road traffic accidents, falls and interpersonal violence. Prevention and interventional strategies including education, law enforcement, physical and social engineering must focus on these aetiologies. Current measures are clearly insufficient and more effective strategies are urgently warranted.

Antimicrobial resistance of Escherichia coliisolates from broiler chickens and humans

BackgroundAntimicrobial usage is considered the most important factor promoting the emergence, selection and dissemination of antimicrobial-resistant microorganisms in both veterinary and human medicine. The aim of this study was to investigate the prevalence and genetic basis of tetracycline resistance in faecal Escherichia coli isolates from healthy broiler chickens and compare these data with isolates obtained from hospitalized patients in Jamaica.ResultsEighty-two E. coli strains isolated from faecal samples of broiler chickens and urine and wound specimens of hospitalized patients were analyzed by agar disc diffusion to determine their susceptibility patterns to 11 antimicrobial agents. Tetracycline resistance determinants were investigated by plasmid profiling, transformations, and amplification of plasmid-borne resistance genes. Tetracycline resistance occurred at a frequency of 82.4% in avian isolates compared to 43.8% in human isolates. In addition, among avian isolates there was a trend towards higher resistance frequencies to kanamycin and nalidixic acid (p < 0.05), while a greater percentage of human isolates were resistant to chloramphenicol and gentamicin (p < 0.05). Multiple drug resistance was found in isolates from both sources and was usually associated with tetracycline resistance. Tetracycline-resistant isolates from both avian and human sources contained one or several plasmids, which were transmissible by transformation of chemically-competent E. coli. Tetracycline resistance was mediated by efflux genes tetB and/or tetD.ConclusionThe present study highlights the prevalence of multiple drug resistant E. coli among healthy broiler chickens in Jamaica, possibly associated with expression of tetracycline resistance. While there did not appear to be a common source for multiple drug resistance in the strains from avian or human origin, the genes encoding resistance are similar. These results suggest that genes are disseminated in the environment and warrant further investigation of the possibility for avian sources acting as reservoirs for tetracycline resistance.

Clinical and epidemiological characteristics of adult and adolescent patients newly diagnosed with the human immunodeficiency virus at a jamaican clinic for sexually transmitted infections

Persons infected with the human immunodeficiency virus (HIV) may have protean clinical manifestations. These characteristics have not been described for adult patients in Jamaica. This study was conducted to determine the clinical and epidemiological characteristics of adult and adolescent persons newly diagnosed with HIV presenting at a specialized clinic for sexually transmitted infections (STI). A retrospective analysis of the medical records of adult and adolescent patients newly diagnosed with HIV was undertaken over a 12-month period. The results showed that most patients (64%) were between 20 and 39 years old (age range 14-68 years, M:F ratio 1.4:1). Heterosexual practice was admitted to by 77% of patients. At the time of presentation most patients (53%) were asymptomatic while 24% had some symptoms and 21% had acquired immunodeficiency syndrome (AIDS). The most common presentation was generalized lymphadenopathy (67%) which was significantly higher than skin rash (27%), oral candidiasis (24%), cough (24%), weight loss (24%) and pallor of mucous membranes (19%, p < 0.001). This study affirms that young people account for the majority of new cases of HIV infection. The heterosexual route was the predominant mode of transmission. Generalized lymphadenopathy was the commonest presenting feature of persons newly diagnosed with HIV infection.

Transfer of head-injured patients in Jamaica: is there a problem?

Head-injured patients are often transferred to the University Hospital of the West Indies (UHWI) for tertiary care. There is no standardized, agreed protocol governing their transfer. During the three-year period January 1998 to December 2000, 144 head injured patients were transferred to the UHWI from other institutions. They were 70% male, had a mean age of 34 years and spent a mean of 13 days in hospital. Eighteen per cent were admitted to the Intensive Care Unit, where they spent a mean of nine days. On arrival, mean pulse rate was 92 +/- 22 beats/minute, mean systolic blood pressure was 130 +/- 27 mmHg and mean diastolic was 76 +/- 19mmHg. Twenty-eight per cent of patients had a pulse rate above 100/min on arrival and 13.8% had systolic blood pressure below 60 mmHg. The Glasgow Coma Scale score was unrecorded at the referring institution in 70% of cases and by the receiving officers at the UHWI in 23% of cases. Intubation was done on only half of those who were eligible. Junior staff members initiated and carried out transfers whenever this was documented. The types of vehicles and monitoring equipment used could not be determined in most instances. Fifty-eight per cent of patients had minor head injuries, 12%, severe injury and 33%, associated injuries requiring a variety of surgical procedures by multiple specialties. Most patients (80.6%) were discharged home but 11.8% died in hospital. Transfer of head-injured patients, many with multiple injuries is not being performed in a manner consistent with modern medical practice. There is urgent need for implementation of a standardized protocol for the transfer of such patients in Jamaica.

Hepatitis B and C viruses and sexually transmitted disease patients in Jamaica

Objectives: To determine the prevalence of hepatitis C virus (HCV), hepatitis B virus (HBV), human immunodeficiency virus (HIV) infections, and risk factors for HCV and HBV infections in sexually transmitted...

Psychological Distress and Coping in Sickle Cell Disease: Comparison of British and Jamaican Attitudes

Objective. To investigate possible differences in coping mechanisms in the painful crisis between Jamaican and London patients with homozygous sickle cell disease. Design. Patients recruited from two London hospitals and the MRC Laboratories (Jamaica) at the University of the West Indies, Kingston, Jamaica were assessed using a questionnaire design. Patients with homozygous sickle cell disease were included, 30 in London and 30 in Jamaica. Results. Jamaican patients in Jamaica had less general anxiety, a lower emotional response to pain, lower levels of perceived pain, and felt better able to decrease their pain. London patients believed that the disease had a more marked effect on their quality of life. Conclusion. Understanding the differences between patients' response to pain and their coping ability between Jamaican and UK patients may have important lessons for evolving effective management in the UK.

Jamaican Sbeta+-thalassaemia: mutations and haematology.

The sickling disorders are a common cause of morbidity and mortality in Jamaica. Sickle cell beta+-thalassaemia is the fourth commonest form, occurring in one in every 3000 births. This is a heterogeneous condition, producing HbS, HbF and HbA2 with variable amounts of HbA, depending on the mutation and, within a defined population, only a few beta-thalassaemia mutations occur at high frequency. This study establishes the frequency of beta-thalassaemia mutations in Sbeta+-thalassaemia patients in Jamaica. In addition, comparison of the haematological phenotypes is possible by looking at the 'average steady-state haematology' of the different mutational groups. Blood samples from 132 unrelated Sbeta+-thalassaemia patients attending the MRC Sickle Cell Unit at the University of the West Indies were analysed by amplification refractory mutation system (ARMS) polymerase chain reaction (PCR) or sequencing to determine the nature and frequencies of the underlying beta-thalassaemia mutations. Ten mutations were identified, four of which accounted for 93% of patients studied. These were -29(A --> G) in 71 (54%), -88(C --> T) in 27 (20%), polyA(T --> C) in 17 (13%) and IVS1-5(G --> C) in nine (7%). The six remaining mutations found at low frequency were C24(T --> A) in two patients and one each of IVS2-848(C --> A), -90(C --> T), IVS1-5(G --> T), IVS1-5(G --> A) and IVS1-6 (T --> C). In one individual, no mutation was found. The three commonest mutations were all associated with haemoglobin levels of greater than 10 g/dl, whereas IVS1-5 (G --> C) had a more severe haematological phenotype. The predominance of -29(A --> G) and -88(C --> T) is in keeping with other studies on populations of African origin. IVS1-5(G --> C) is found chiefly in Indian populations, and all affected families acknowledged Indian ancestry, reflecting the prominent Indian community in Jamaica.

Seroprevalence of HTLV-1 in chronic disease patients in Jamaica

A high seropositivity rate of human T cell lymphotropic virus type 1 (HTLV-1) infection was found in Jamaican patients with chronic diseases. However, except for tropical spastic paraparesis, polymyositis, adult T cell leukaemia/lymphoma and polyneuropathies of undetermined cause, HTLV-1 seropositivity rates in chronic disease patients were not significantly different from that found in healthy Jamaicans. These results indicate that there is no increased risk of HTLV-1 infection or HTLV-1 associated disease in patients with chronic diseases compared to the general Jamaican population. The association of unclassified polyneuropathies with HTLV-1 reported herein is a novel one which requires further studies to elucidate its nature.