Housefly Musca Domestica Research Articles

Review of Methods to Monitor House Fly (Musca domestica) Abundance and Activity.

The house fly is a ubiquitous pest commonly associated with animal facilities and urban waste. When present in large numbers, house flies can negatively impact humans and animals through nuisance and the transmission of pathogens. Since the development of fly traps and sticky papers to capture flies in the late 1800s, these and other methods have been used as a means to monitor change in house fly density or fly activity over time. Methods include substrate sampling to record density of immature flies, visual observations of adult fly activity, instantaneous counts of landing or resting flies, accumulation of adult flies on/in traps, or accumulation of fly fecal and regurgitation spots deposited by flies onto white cards. These methods do not estimate true house fly density, but rather provide an index of house fly activity that is related to both fly density and the frequency of individual fly behavior (e.g., frequency of flight, landing events) and which is likely more predictive of negative impacts such as nuisance and pathogen transmission. Routine monitoring of house fly activity is a critical component of a house fly management program. Fly activity should be held to a level below a predetermined activity threshold ('action threshold') above which negative impacts are anticipated to occur. This article is a review of methods utilized for monitoring house fly (Diptera: Muscidae) activity.

Biolubricant base stock with improved low temperature performance: Ester complex production using housefly (Musca domestica L.) larval lipid

Lipid generated from housefly ( Musca domestica L.) larvae fed by municipal waste is a renewable lipid resource, however, the low unsaturated degree prevents it from producing trimethylolpropane fatty acid triester as lubricant, due to its poor low-temperature performance. A new fatty acid esters complex consisting of trimethylolpropane fatty acid triester and 2-ethylhexyl fatty acid ester was produced from housefly larval lipid. Separated from molecular distillation, the acylglycerols were first trans-esterified into fatty acid methyl ester and then further trans-esterified with trimethylolpropane into trimethylolpropane esters. The purified trimethylolpropane fatty acid triester is with purity of 98.4% and further blended with 30 wt% 2-ethylhexyl fatty acid ester derived from housefly larval free fatty acid. The pour point was substantially lowered from −3 °C to −12 °C while the lubricity performance is within standard of ISO VG 32, with minor improvement of water separability compared with pure trimethylolpropane fatty acid triester. By blending two type bio-lubricants with different advantages on viscosity and pour point, the ester complex with favorable properties was produced using saturated non-food lipid source rather than unsaturated virginal vegetable oil. This study also offers a cleaner and energy-efficient approach for high value-added product production for non-food lipid industry. • Mixture of esters was produced from housefly larval lipid through bioconversion. • Free fatty acid fraction is used for producing pour point depressant. • Pour point of TFATE is lowered to −12 °C by adding 30 wt% 2-EH ester. • Viscosity of the esters mixture is within ISO VG 32 lubricant standard. • The proposed method has high energy efficiency and product value.

Dietary Supplementation with Housefly (Musca domestica) Maggot Meal in Growing Beagles: Hematology, Serum Biochemistry, Immune Responses and Oxidative Damage

Abstract The present study was carried out to evaluate the hematology, serum biochemistry, immune responses and oxidative damage of growing beagles fed a diet supplemented with housefly (Musca domestica) maggot meal (MM). Weanling beagles (initial body weight 2.69 ± 0.17 kg) were fed a control diet (0% MM) or experimental diet (5% MM) for 42 days. The results indicated that the diet supplemented with 5% MM had no significant effects on the hematology and serum biochemistry of growing beagles (P>0.05). Meanwhile, neither the serum concentrations of lysozyme and C-reactive protein nor the serum antibody responses to canine distemper virus and canine parvovirus were influenced by dietary MM supplementation (P>0.05). However, dogs in the experimental group had lower serum levels of malondialdehyde and protein carbonyl than those in the control group (P<0.05). These findings demonstrated that MM could be used as an alternative protein source in growing beagles without any adverse effects on hematology, serum biochemistry and immune responses. Furthermore, dietary MM could alleviate oxidative damage in growing beagles.

Impact of essential oils on Musca domestica larvae: oxidative stress and antioxidant responses

The housefly (Musca domestica) is incriminated as a vector of many detrimental diseases like diarrhoea, cholera, etc. To combat its population below threshold levels many types of insecticides including essential oils (EOs) have been tested from time to time. However the insect has often shown some resistance to proliferate and reproduce continuously. In view of this objective, present study highlights the antioxidative responses of M. domestica larvae to Bay, Lemongrass and Tea tree EOs during a short-term exposure (24 h) to respective compounds. After treatment with EOs, the housefly larvae showed increased levels of Malondialdehyde (MDA) indicating increased lipid peroxidation due to tested oils. The Tea tree essential oil induced substantial increase in superoxide dismutase and glutathione peroxidase activities as compared to lemongrass and bay EOs. Moreover, Lemongrass EO was found to significantly affect the catalase activity depicting a value of 0.0733 ± 0.006 units per milligram of protein (U/mg protein). In case of glutathione reductase activity, higher effect was induced by bay EO exhibiting 0.0150 ± 0.001 U/mg protein which was preceded by tea tree compound. The observations of the present study signpost that M. domestica has evolved antioxidant defence mechanism to combat reactive oxygen species generated by short term exposure of LC50 concentration of tested EOs. Therefore proper optimization of EO concentration together with time of exposure of the insect becomes imperative for formulating organic insecticides against house fly populations.

HOUSEFLIES (MUSCA DOMESTICA) AS POTENTIAL CARRIERS OF HUMAN INTESTINAL PARASITES IN JALINGO METROPOLIS

House flies (Musca domestica) are nuisance pest because of their ubiquitous nature in the mechanical transmission of parasites to man. This study identifies the pathogenic parasites associated with house fly in Jalingo, Nigeria. A total of 200 flies were collected from 4 locations (Abattoir, Jalingo Main Market, Kasuwan Bera and Mile-Six Market) within Jalingo metropolis between August, 2019 and November, 2019. Three species of flies were identified during the study namely; Musca spp, Sacophage spp and Stomoxys spp. The house flies were analyzed for the presence pathogenic parasites using standard laboratory techniques. The results showed that the parasites E. histolytica 25(28.74 %), Taenia spp 25(28.74 %), A. lumbricoides 20(22.99 %), Giardia lamblia 8(9.20 %) and Trichuris trichiura 9(10.34 %) are associated with the house flies. The results showed no significant variation (X2= 0.61, p>0.05) between the parasites species. It can be concluded that house flies in Jalingo harbor pathogenic parasites on their bodies. The fact that houseflies have been incriminated to be mechanical transmitters of pathogenic diseases to man because of their anthropogenic lifestyles, measures must be taken to control fly population in order to avert both the present and future outbreak of disease conditions emanating from the flies activities.

Phosphatase and acetylcholinesterase activities in different stages of the life cycle of the housefly Musca domestica L.

Phosphatase and acetylcholinesterase activities in different stages of the life cycle of the housefly Musca domestica L.

Body Water-Mediated Conductivity Actualizes the Insect-Control Functions of Electric Fields in Houseflies.

Simple SummaryThe attractive forces generated in a static electric field, as well as corona and arc discharges generated in a dynamic electric field, are practical approaches for trapping and killing insects that enter the electric field. These electrostatic methods are realized by the conductive nature of the insect body. Thus, this work examined the role of body water on the conduction of electricity in the insect body. Adult houseflies (Musca domestica) were subjected to dehydration, rehydration, refrigeration, and freezing and thawing. These insects were then placed in static and dynamic electric fields to examine whether the release of negative charges from the insect caused attraction in the static field, as well as whether the fly was heated or dismembered when electricity passed through its body in a dynamic field. There was no current in the bodies of dehydrated and frozen flies; hence, there was no attractive force or discharge exposure. In the remaining insects, the results were identical to those in the control insects. Therefore, the conduction of electricity in the insect’s body water enables the insect-control effects of the electric fields.In the present study, the relationship between body water loss and conductivity was examined in adult houseflies (Musca domestica). The events an insect experiences in an electric field are caused by the conductive nature of the insect body (i.e., movement of electricity within or its release from the insect). After houseflies were dehydrated, rehydrated, refrigerated, and frozen and thawed, they were placed in static and dynamic electric fields. Untreated houseflies were deprived of their free electrons to become positively charged and then attracted to the insulated negative pole in the static electric field and were exposed to corona and arc discharge from non-insulated negative pole in the dynamic electric field. There was no current in the bodies of dehydrated and frozen flies; hence, there was no attractive force or discharge exposure. In the remaining insects, the results were identical to those in the untreated control insects. These results indicated that the reduction of body water conductivity inhibited the release of electricity from the body in the static electric field and the discharge-mediated current flow through the body in the dynamic electric field. The insect was affected by the electric fields because of its conductivity mediated by body water.

The Role of House Fly Musca domestica in transmitting the Intestinal Parasites for Human

The present study is made up during October 2014 till March 2015 to know the parasitic stages which are carried out by different part Musca domestica. The samples are collected from five different places which are included the restaurants, schools , kitchens, grid sewage and wild land. The number of the samples which are examined is reached 100 samples, all of them were examined by direct smear using the physiological solution and lugal iodine solution by flotation way and by using saturated zinc sulfide solution and diagnosed four species of intestinal parasites which are Entamoeba coli, Entamoeba histolytic, Giardia lamblia ,Trichomonas hominess .

Insecticidal efficacy of binary fly bait against houseflies Musca Domestica L.

Modern methods of veterinary disinsection are based on the use of chemical agents. Efficiency of insecticides is determined by composition, form and method of use. Use of mixtures of insecticidal active substances is recommended as one of the anti-resistance strategies, with the most preferred formulations in the form of baits. The purpose of the present work was to evaluate the insecticidal efficacy of the bait composition containing ivermectin and fipronil against the adult fly of Musca domestica L. Intestinal insecticidal effect of a mixture of two active substances (ivermectin and fipronil) on the imago of M. domestica laboratory culture was evaluated by the method of group feeding in laboratory conditions. A mixture containing 0.06% ivermectin and 0.015% fipronil caused the death of (97.6 ± 2.4)% of insects during 24 hours of exposure. Developed insecticidal bait Mukhnet IF (ivermectin 0.06% + fipronil 0.015%) had a 100% insecticidal effect against imago M. domestica in the laboratory after 48 hours of exposure, as well as the monocomponent bait Mukhnet I (ivermectin 0.6%) and Mukhnet F (fipronil 0.15%) and Agita comparison drug (thiamethoxam 10%). The insecticidal efficacy of the developed bait Mukhnet IF against flies in the production environment on the first day after processing the livestock building was 96.7%, which is comparable to the efficiency of the monocomponent bait Mukhnet I and Mukhnet F and the comparison preparation. Obtained results allowed authors to propose «Method for reducing the number of flies at objects of veterinary sanitary inspection» (RU 2692620).

Ancient DNA preservation, genetic diversity and biogeography: A study of houseflies from Roman Qasr Ibrim, lower Nubia, Egypt

The optimal preservation of many Egyptian archaeological sites provides unique opportunities in the research into the evolution of synanthropic species, wild animals or plants, which benefit from close association with man-made human habitats. In this study we extracted and analysed ancient mitochondrial DNA (mtDNA) from three synanthropic insect species, two storage pests, Sitophilus granarius (Coleoptera: Curculionidae) (N = 8) and Trogoderma granarium (Coleoptera: Dermestidae) (N = 14), and the housefly Musca domestica (Diptera: Muscidae), (N = 14), from Roman Qasr Ibrim, an Egyptian frontier site located in lower Nubia. The impact of different experimental variables on ancient DNA recovery was also evaluated, confirming that it is possible to extract endogenous ancient DNA from desiccated specimens while preserving the insect exoskeleton. A phylogenetic comparison of the Qasr Ibrim housefly mtDNA-COI (COI) with modern housefly sequences, revealed that they were genetically similar to modern Egyptian, Near Eastern, Indian, Japanese, and US/Canadian populations. As the now cosmopolitan houseflies were transported by human populations alongside domestic animals and crops and may have aided the spread of disease, these findings provide important information for these processes. While limited by the resolution of the comparative databases, our research suggests the existence of biological invasions and links across the Red Sea from Egypt to the Arabian Peninsula, and exchanges between India and Egypt. We demonstrate the great potential of fossil insect aDNA for reconstructing biogeographic and diachronic species distribution and for better understanding past environments.

Environmental and Sex Effects on Bacterial Carriage by Adult House Flies (Musca domestica L.).

Adult house flies frequent microbe-rich sites such as urban dumpsters and animal facilities, and encounter and ingest bacteria during feeding and reproductive activities. Due to unique nutritional and reproductive needs, male and female flies demonstrate different interactions with microbe-rich substrates and therefore dissemination potential. We investigated culturable aerobic bacteria and coliform abundance in male and female flies (n = 107) collected from urban (restaurant dumpsters) and agricultural (dairy farm) sites. Whole-fly homogenate was aerobically cultured and enumerated on nonselective (tryptic soy agar; culturable bacteria) and selective (violet-red bile agar, VRBA; coliforms) media. Unique morphotypes from VRBA cultures of agricultural flies were identified and tested for susceptibility to 14 antimicrobials. Female flies harbored more bacteria than males and there was a sex by site interaction with sex effects on bacterial abundance at the urban site. Coliform abundance did not differ by sex, site or sex within site. Both male and female flies carried antimicrobial-resistant (AMR) bacteria: 36/38 isolates (95%) were resistant to ≥1 antimicrobial, 33/38 were multidrug-resistant (≥2), and 24/38 isolates were resistant to ≥4 antimicrobials. Our results emphasize the role of house flies in harboring bacteria including AMR strains that pose a risk to human and animal health.

Toxicity of the essential oil from Thymus serpyllum and thymol to larvae and pupae of the housefly Musca domestica L. (Diptera: Muscidae).

The essential oil (EO) of Thymus serpyllum and thymol were evaluated for their insecticidal activity against the housefly (Musca domestica) larvae and pupae. Contact toxicity and fumigation bioassays were used. Chemical composition analysis of T. serpyllum EO by gas chromatographic mass spectrometry (GC-MS) revealed that thymol (41.6%), p-cymene (21.9%), and γ-terpinene (19.2%) were the major components. For larval assays, the LC50 value of T. serpyllum EO was 0.4 μl/cm2 for contact toxicity and 20.9 μl/l for fumigation toxicity. For thymol, the contact toxicity LC50 value was 0.035 μl/cm2 and the fumigation LC50 value was 2.0 μl/l. For the pupal assay, T. serpyllum EO had a percentage inhibition rate (PIR) value of 100% for both contact toxicity (1.0 μl/cm2) and fumigation toxicity assay (25 μl/l), whereas thymol had a PIR of 100% for contact toxicity (0.1 μl/cm2) and fumigation assay (5 μl/l). This study shows that T. serpyllum EO and thymol are toxic to housefly larvae and pupae and have the potential for use in the population control of this species.

Diurnal Flight Activity of House Flies (Musca domestica) is Influenced by Sex, Time of Day, and Environmental Conditions.

House flies (Musca domestica L.) are common synanthropic pests associated with confined animal operations, including dairy farms. House flies can cause substantial nuisance and may transmit human and animal pathogens. Surprisingly little is known about the daily flight activity of house flies. This study examined diurnal house fly flight activity on two southern California dairies using clear sticky traps to capture flies over hourly intervals. Flight activity for both males and females combined started near dawn and generally increased to a single broad activity peak during mid to late morning. Male flight activity peaked earlier than female flight activity and this separation in peak activity widened as mean daytime temperature increased. Flight activity for both sexes increased rapidly during early morning in response to the combined effects of increasing light intensity and temperature, with decreasing flight activity late in the day as temperature decreased. During midday, flight activity was slightly negatively associated with light intensity and temperature. Collection period (time of day) was a useful predictor of house fly activity on southern California dairies and the diurnal pattern of flight activity should be considered when developing house fly monitoring and control programs.

Efficacy of Neem Seed Extracts on Survival, Longevity of Housefly Musca domestica L. (Diptera: Muscidae)

Efficacy of Neem Seed Extracts on Survival, Longevity of Housefly Musca domestica L. (Diptera: Muscidae)

Selection, Reversion, and Characterization of House Fly (Diptera: Muscidae) Behavioral Resistance to the Insecticide Imidacloprid.

Insecticide resistance in pest populations is an increasing problem in both urban and rural settings caused by over-application of insecticides and lack of rotation among chemical classes. The house fly (Musca domestica L.) is a cosmopolitan fly species implicated in the transmission of numerous pathogens, and which can be extremely pestiferous when present in high numbers. The evolution of insecticide resistance has long been documented in house flies, with resistance reported to all major insecticide classes. House fly resistance to imidacloprid, the most widely used neonicotinoid insecticide available for fly control, has been selected for in field populations through both physiological and behavioral resistance mechanisms. In the current study, house flies collected from a southern California dairy were selectively bred for behavioral resistance to imidacloprid, without increasing the physiological resistance profile of the selected flies. Flies were also successfully selected for behavioral susceptibility to imidacloprid. The rapid selection for either behavioral resistance or behavioral susceptibility suggests that inheritable alleles conferring behavioral resistance were already present in the wild-type fly population collected from the dairy site. The methods used for the specific selection of behavioral resistance (or susceptibility) in the fly population will be useful for further studies on the specific mechanisms conferring this resistance. House fly behavioral resistance was further investigated using behavioral observation and feeding preference assays, with resistance determined to be both contact-dependent and specific to the insecticide (imidacloprid) rather than to a non-insecticidal component of a bait matrix as previously documented.

Two ferritin genes (MdFerH and MdFerL) are involved in iron homeostasis, antioxidation and immune defense in housefly Musca domestica

Ferritin is a ubiquitous multi-subunit iron storage protein, made up of heavy chain and light chain subunits. In recent years, invertebrate ferritins have emerged as an important, yet largely underappreciated, component of host defense and antioxidant system. Here, two alternatively spliced transcripts encoding for a unique ferritin heavy chain homolog (MdFerH), and a transcript encoding for a light chain homolog (MdFerL) are cloned and characterized from Musca domestica. Comparing with MdFerH1, a fragment is absent at the 5′ untranslated region of MdFerH2, where a putative iron response element is present. Amino acid sequence analysis shows that MdFerH possesses a strictly conserved ferroxidase site, while MdFerL has a putative atypical active center. Tissue distribution analysis indicates that MdFers are enriched expressed in gut. When the larvae receive diverse stimulations, including challenge by bacteria, exposure to excess Fe2+, doxorubicin or ultraviolet, the expression of MdFers is positively up-regulated in different degrees and different temporal patterns, indicating their potential roles in oxidative stress. The two mRNA isoforms of MdFerH appear to be differentially expressed in different tissues, but seem to show the similar expression patterns under diverse stress conditions. Further investigation reveals that silencing MdFers can alter the redox homeostasis, leading elevated mortalities of larvae following bacterial infection. Inspiringly, recombinant MdFerL produced in Pichia pastoris shows significant iron-chelating activity in vitro. These results suggest a pivotal role of ferritins from housefly in iron homeostasis, antibacterial immunity and redox balance.

Potentials of Plant Oil Extracts (Azadirachta indica and Ocimum suave) in Single and Mixed Forms Against Adult House Fly (Musca domestica)

The insecticidal potentials of plant oil from neem (Azadirachta indica) seeds and wild basil (Ocimum suave) leaves was applied as individual oils and mixed equal proportion (50:50) against adult house flies (Musca domestica). The experiment was setup on a completely randomised design using two replicates per concentration's formulation. Oils from the extracts of Azadirachta indica and Ocimum suave were formulated as emulsifiable concentrates at 0.005, 0.010, 0.015, 0.20/50 ml of water, and then sprayed on 15 newly emerged reared adult house flies in cages at an hour interval for six hours. There was significant difference (P < 0.05) in the percentage mortality of adult house flies as the concentration increased from 0.005–0.20/50 ml water of both the single formulations (A. indica and O. suave) and the equally mixed 50:50 ratio. There was also significant difference as the time of exposure increased from the first hour to the sixth hour. The concentration of A. indica and O. suave required to cause 50 % mortality of adult house fly was 0.066/50 ml water at 3.4 h and 0.072/50 ml at 3.8 h, respectively, while the concentration of the mixed oils at equal proportion (50:50) required to cause 50 % mortality of house fly was less (0.065/50 ml water) and at 3.4 h. This study has therefore revealed the potency of the plant oil extracts (A. indica and O. suave) as single and mixed at equal proportion (50:50) against house fly (M. domestica). However, the formulation of the mixed plant oil required to cause 50 % mortality of the house fly was less, showing higher potential over the single formulations. Therefore using the mixed plant extracts is recommended for the proper management of house fly.

CHANGES IN SUSCEPTIBILITIES TO INSECTICIDES IN MUSCA DOMESTICA UNDER SELECTION WITH FIPRONIL

New knowledge about resistance and cross-resistance to insecticides of different chemical classes in insects is crucial for correct and effective pest management. This paper reports changes in the susceptibility to insecticides of different chemical classes in the first generations of houseflies Musca domestica L. when they were selected with fipronil. The selection of M. domestica was carried out by feeding adult insects with sugar containing fipronil in a dose that causes the 40–60% mortality of insects. The susceptibility of adults and larvae to insecticides was evaluated by the resistance ratio (RR). In the fipronil-selected strain of M. domestica, the susceptibility to fipronil was unchanged in adults in 3–5 generations and increased in larvae in the fifth generation (RR = 0.5). The susceptibility to deltamethrin decreased in adults of the fourth generation and in larvae of the fifth generation, and the RR was 4.5 and 4.3, respectively, that may suggest the development of cross-resistance in the future. The susceptibility to chlorfenapyr was reduced in adults of fipronil-selected flies of the fourth generation (RR = 1.9). The susceptibility to ivermectin increased in adults of fipronil-selected flies (RR = 0.67) and in larvae of the fifth generation (RR = 0.5). The susceptibility to acetamiprid in the fipronil-selected strain and the laboratory (unselected) strain of M. domestica did not differ. The results are useful for the development of insecticide resistance management programs.

Housefly (Musca domestica L.) associated microbiota across different life stages

The housefly (Musca domestica L.) lives in close association with its microbiota and its symbionts are suggested to have pivotal roles in processes such as metabolism and immune response, but it is unclear how the profound physiological changes during ontogeny affect the housefly’s associated microbiota and their metabolic capabilities. The present study applies 16S rRNA gene amplicon sequencing to investigate the development of the host-associated microbiota during ontogeny. The potential for microbiota transfer between developmental stages, and the metabolic potential of these microbiota were evaluated. Representatives of Firmicutes were observed as early colonisers during the larval stages, followed by colonisation by organisms affiliating with Proteobacteria and Bacteroidetes as the flies matured into adults. Microbiota observed across all the developmental stages included Lactococcus, Lactobacillus and Enterococcus, while Weissella and Chishuiella were associated with newly hatched larvae and adults, respectively. Predictive metabolic profiling of the identified microorganisms further suggested that the microbiota and their functional profile mature alongside their host and putative host-microbe relationships are established at different stages of development. The predicted metabolic capability of the microbiota developed from primarily simple processes including carbohydrate and nucleotide metabolisms, to more complex metabolic pathways including amino acid metabolisms and processes related to signal transduction.

Frequency and Antimicrobial Resistance Patterns of Bacterial Species Isolated from the Body Surface of the Housefly (Musca domestica) in Akure, Ondo State, Nigeria.

Background:The emergence and spread of antibiotic resistant bacteria has become a serious problem worldwide. Houseflies are potential carriers of pathogenic and resistant bacteria and could be contributing to the global spread of these strains in the environments. We investigated the prevalence and antimicrobial resistant profiles of bacteria isolated from houseflies in Akure.Methods:Twenty-five houseflies were captured by a sterile nylon net from the slaughterhouse, garbage dump, human house, hospital, and eatery from 9:00am to 1:00pm when the flies were active and transported immediately to the laboratory in sterile containers for processing. Bacterial loads were enumerated by serial dilution and plating on nutrient agar and selective media. Bacteria species were isolated by conventional isolation technique. Antibiotic susceptibility test was determined by the Kirby-Bauer disc diffusion technique.Results:Sixty-seven bacterial species were isolated from 25 samples that were collected. The predominant bacterial species was Escherichia coli (n= 31, 45%), followed by Klebsiella pneumoniae (n= 17, 25%), Staphylococcus aureus (n= 11, 16%) and Pseudomonas aeruginosa (n= 3, 4.3%). The bacterial load of the samples ranged from 9.7×105CFU/mL to 1.65×106CFU/mL. The results revealed that all isolates of Pseudomonas aeruginosa, Salmonella spp, and Proteus mirabilis were resistant to streptomycin and cotrimoxazole, augmentin and amoxicillin respectively. None of the S. aureus isolates was resistant to cotrimoxazole, chloramphenicol, sparfloxacin, augmentin, and ofloxacin. All isolates were multi-drug resistant.Conclusion:House flies that were collected from the slaughterhouse, garbage dump, human house, hospital, and eatery may participate in the dispersal of pathogenic and resistant bacteria in the study environment.