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PubMed1996

Isolation and identification of bacteria associated with the screwworm fly Cochliomyia hominivorax, coquerel and its myiasis.

We studied eight different myiasis of sheep caused by screwworm flies under laboratory conditions. Swabs were taken from the wound, before, during, and after the myiasis. Seven hundred and thirty-one samples were streaked on different bacteriological media. All samples were identified by Api System (bioMerieuex). We found thirty-eight different bacterial species in the exudates from the myiasis (before, during, and after the parasitic cycle). The analysis of bacterial flora of the screwworm showed, on larvae stage 1, 10 different bacterial species, on larvae 2, 12 bacterial species; larvae 3, 15 bacterial species; crawl off, 15 bacteria species, pupa, 9 bacterial species; and adults, 2 bacterial species and on the pioneer fly, 14 different bacterial species were isolated and identified.

Animals↗
PubMed2004

Penile myiasis: a case report.

We report a case of penile myiasis in a Brazilian man caused by the larva of Dermatobia hominis. Myiasis is a parasitic disease of humans and other vertebrates caused by larvae of several fly species. Although urinary myiasis is well recognised, infestation of the genital tissue is a rare occurrence. Once the diagnosis has been made, the treatment is usually straightforward and uncomplicated.

Adult↗
PubMed2004

'Furuncular myiasis of the breast caused by the larvae of the Tumbu fly (Cordylobia anthropophaga)'.

BACKGROUND: Cutaneous myiasis of the breast due to infestation by the larva of Cordylobia anthropophaga is rare. To the best of our knowledge, only one case has been reported in the English literature. This rarity calls for an awareness of its possibility as a cause of furuncular breast lesions, especially in areas where the C. anthropophaga (Tumbu fly) is endemic or in patients returning from such areas. As it can be easily confused with other furuncular breast lesions (like tuberculosis, mycosis, actinomycosis, furunculosis, chronic breast abscess and fungating malignancies), this awareness is important to avoid misdiagnosis or delay in diagnosis. We present a case of furuncular breast myiasis due to the larvae of C. anthropophaga earlier misdiagnosed as mastitis in a patient living in tropical Africa (Nigeria) where the Tumbu fly is endemic. CASE PRESENTATION: We report a 70 year old woman who presented with a week history of itchy multiple discharging sinuses of the right breast. The sinuses contained wriggling larvae of C. anthropophaga. Fourteen larvae were extracted from the breast and the sinuses healed quite well after the extraction. CONCLUSIONS: Cutaneous myiasis of the breast is rare, hence, an awareness of its clinical features is necessary when a patient presents with furuncular skin lesions especially in endemic areas or people returning from such areas. Diagnosis is mainly clinical and lesions heal well after the extraction of the larvae. Preventive measures such as ironing after drying of dresses and a good personal hygiene are crucial in controlling C. anthropophaga infestation.

Aged↗
PubMed1998

[Gastrointestinal human myiasis caused by Eristalis tenax].

The myiasis observed in Bariloche are characterized and the probable conditions under which the infestations took place established. The larvae obtained from faeces of 2 patients were identified as Eristalis tenax (Diptera: Syrphidae) according to Hartley (1961) and Organización Panamericana de la Salud keys (1962). These 2 cases of human gastrointestinal myiasis were the first to be registered in Bariloche (Patagonia, Argentina) and their characteristics were similar to those described for this species in other parts of the world. The lack of specific control measures in the domestic water supply system was the most probable cause of the infestation. This event extends the distribution of E. tenax and human gastrointestinal myiasis in South America to 41 degrees 03' S.

Adolescent↗
PubMed1999

Palpebral myiasis.

Myiasis is most prevalent in Mexico, central and south America, tropical Africa, and the southwestern United States. Although dermal myiasis is rare in most of the United States, it is a disorder that may be seen in international travelers. In the United States, external myiasis is usually caused by the cattle botfly. We report here a case of ophthalmomyiasis involving the left upper eyelid of a child. We examined a six-year-old boy who presented to the Massachusetts Eye and Ear Infirmary (MEEI) in September 1998. He complained of persistent swelling of his left upper eyelid for the previous ten days. The edema and erythema were unresponsive to warm compresses and oral antibiotics. Ocular examination revealed a mild preseptal cellulitis of the left upper eyelid with a small draining fistula. On slit-lamp examination, we found one larva protruding intermittently from the fistula site. The larva was extracted with forceps, wrapped in a moist towel and sent in a jar to the parasitology laboratory. The specimen was identified as a Cuterebra larva by a parasitologist at the Harvard School of Public Health. One week later, the patient's eyelid edema and erythema had completely resolved.

Animals↗
PubMed2002

Observations on myiasis by the calliphorid, Bufolucilia silvarum, in the eastern American toad (Bufo americanus americanus) from southeastern Wisconsin.

Larvae of certain species of blowflies (Calliphoridae) cause myiasis in amphibians which may result in significant mortality, yet there are few reports from North America. In this study, we observed primary myiasis in a population of juvenile eastern American toads (Bufo americanus americanus) collected during May-July 1998 from southeastern Wisconsin (USA). Nine (6%) of 140 toads were infected by the green blow fly (Bufolucilia silvarum) with a mean intensity of 10.5 +/- 7.2 (range = 1-24). Weekly parasite prevalence and mean intensity remained low, ranging from 0-20% and 2 +/- 1.4 to 14 +/- 6, respectively. We found: 1) flies lay eggs on healthy toads, 2) eggs hatch with first instar maggots penetrating under the skin, 3) maggots develop to mature third instars within 5-7 days, 4) maggots leave the host and form pupa within 8-11 days of hatching, and 5) maggots pupate within 7-9 days at room temperature. All infected toads died within 1-2 wk as a result of the infection. The low prevalence observed in this study and other reports of this species from mammalian and bird carcasses indicated that B. silvarum is probably a facultative parasite of toads and other amphibians in the United States. This is the first report of B. silvarum causing myiasis in Wisconsin amphibians and the first report in eastern American toads in the United States.

Animals↗
PubMed1999

[Human urinary myiasis caused by Fannia canicularis (Diptera, Muscidae) larvae in Algeria].

BACKGROUND: Human urinary myiasis is caused by fly larvae which complete their entire cycle in the human body. CASE REPORT: A 37-year-old woman living in a village near Sidi Bel Abbes (Algeria) developed a parasite syndrome caused by Fannia canicularis larvae. About twenty larvae specimens were collected during her hospitalization. Larvae were emitted for 2 weeks after a 6-day treatment with cefotaxime for urinary tract infection. DISCUSSION: Urogenital myiasis is almost always subsequent to conditions of poor personal hygiene. In this case authentic larvae infestation was evidenced. The diagnosis of true urinary myiasis was confirmed by repeated emissions of different larval stages including the nymph.

Adult↗
PubMed2002

Cutaneous myiasis in Arkansas.

Myiasis is a rare infestation of any part of the body by larvae of Diptera. Cutaneous myiasis, the most common form seen in tropical climates of Central America, South America and Africa, are extremely rare in the United States. An extraordinary case of cutaneous myiasis was seen in Hot Springs in a 71-year-old healthy white male upon his return from the rain forest of Costa Rica. Manual extraction of one of the larvae by the patient and surgical excision of three other separate subcutaneous larvae were diagnostic and therapeutic in this case.

Aged↗
PubMed2004

[Myiasis caused by Oestridae: serological and molecular diagnosis].

Myiasis-causing Oestridae (bot flies) infect several animal species world-wide, from palaearctic to subtropical/tropical areas. Oestrids affect livestock production causing abortion, reduced milk production, losses in weight and fertility, poor hide quality and an impairment of the host's immune system. In the last few years much research has been carried out on the immunology of these infestations, in order to acquire efficient and reliable diagnostic serological tools; the genome of the different species of Oestridae has been studied to further their molecular identification, taxonomy and phylogenesis. The immunodiagnostic methods for many myiasis causing Oestrids have proven to be a viable alternative to the clinical parasitological examination or the post-mortem examination. Numerous serological tests have been developed for the diagnosis of bovine hypodermosis caused by Hypoderma bovis and Hypoderma lineatum, and ELISAs using larval hypodermin C as the antigen are currently used on serum, individual and pooled milk samples to detect the presence of circulating anti-Hypoderma antibodies. In Italy the best period to sample the animals is November-January, since it is in this period that the antibody kinetics of the animals reaches a peak. Recently the efficacy of the ELISA test on pasteurized milk samples has been demonstrated, allowing the diagnosis of bovine hypodermosis also in areas where there is no information on the presence of the disease and the sampling of the animals is laborious. The cross-reactivity between Przhevalskiana silenus antigens and anti-Hypoderma antibodies led to assessing the usefulness of a simple and cost-effective ELISA for the diagnosis of goat warble fly infection. In particular, it has been demonstrated that infected goats display an antibody peak in November-December in blood and milk, thus making this period suitable for sampling. Although no extensive data is available on the immunology of sheep and goat oestrosis caused by Oestrus ovis, the efficacy of ELISA has been demonstrated by correlating serological results with clinical post-mortem examinations. No immunological techniques are currently used to diagnose gasterophilosis of equids and only one study reports the efficacy of ELISA for detecting anti-Gasterophilus antibodies in infected equids. Several studies have been conducted into the molecular characterization of the mitochondrial DNA (mtDNA)--in particular of the gene encoding for the cytochrome oxidase I (COI)--for many free-living and parasitic arthropods for diagnostic, taxonomic and phylogenetic purposes. As regards Oestridae causing myiasis, the first study features a PCR-RFLP assay of the most common Italian species (i.e. H. bovis, H. lineatum, Gasterophilus intestinalis, P. silenus, O. ovis), which showed clear genetic differences among the genera examined, but no inter-specific variation between the two species of Hypoderma considered. The molecular characterization of the most variable region of the COI gene (encoding for the region from E4 to the terminal COOH) was able to clearly differentiate H. bovis and H. lineatum. The E4-COOH region of the COI gene has been characterized for 18 oestrid species and from a taxonomical point of view, molecular data confirm the morphological classification, with the examined species divided into four subfamilies. New insights have also been gained on the molecular differentiation of the most common species of Hypoderma (i.e. H. bovis, H. lineatum, Hypoderma actaeon, Hypoderma diana and Hypoderma tarandi) and, in particular, the restriction enzyme BfaI, provides a diagnostic profile that can be used to simultaneously differentiate all the species examined. The characterization of the E4-COOH COI gene and the hypervariable region of the gene encoding for the ribosomal Isu revealed the identity of Hypoderma sinense as a new species, infecting cattle and yaks in China. Finally, the molecular analysis of the same mitochondrial and ribosomal regions showed that P. silenus, Przhevalskiana aegagri and Przhevalskiana crossii are morphotypes of the same species.

Animals↗
PubMed2004

[Cutaneous myiasis caused by a double infestation with larvae of Dermatobia hominis and Cochliomyia hominivorax].

In a 51-year-old man who had visited Surinam, cutaneous myiasis was diagnosed, caused by simultaneous infestation with the larvae of two different species of flies: Dermatobia hominis and Cochliomyia hominivorax. On his right lower arm the man had two solitary, furuncle-like lesions with a central breathing hole. Two days after these holes had been occluded with vaseline, two white larvae of D. hominis emerged. On both ankles the man had large, undermined ulcers containing hundreds of creeping larvae about 2 cm in length with a salmon-like colour: C. hominivorax. The larvae were removed from the ulcers by hand and by rinsing with physiological saline, after which the wounds healed rapidly. Myiasis is seen in the Netherlands mostly in people returning from a holiday in myiasis-endemic areas.

Animals↗
PubMed2006

Oral myiasis: a case report.

Oral Myiasis is a rare pathology in humans and is associated with poor oral hygiene, alcoholism, senility, suppurating lesions, severe halitosis and others conditions. The treatment is a mechanical removal of the maggots one by one but a systemic treatment with Ivermectin, a semi-synthetic macrolide antibiotic, have been used for treatment for oral myiasis. We present a case report of a 32-year-old man indigent, alcohol-dependent with an extensive necrotic area and acute swelling in upper lip and fetid odor. The patient's management included topic use of gentian violet, oral therapy with ivermectin (6 mg orally), surgical exploration to remove the larvae and necrotic tissue. After the complete larvae removal the swelling and the wounds were healing normally, the patients was referred to plastic surgery to repair tissue damage. The prevention of human myiasis is by education, but unfortunately in the developing countries some people live in low social condition, predisposing the occurrence of the infestation.

Adult↗
PubMed1991

Otitis media and aural myiasis.

Myiasis is a diseased condition caused by larvae of myiasis producing flies. Still little is known about such an important subject in Egypt. In this paper, the author described three human cases of otitis media associated with aural myiasis. The causative larvae were those of W. magnifica and S. falculata.

Acute Disease↗
PubMed1991

Cutaneous myiasis. Recent advances in biology, immunology and improvements of the control measures.

The evolution of the main topics of study related to the biology, the life-cycle and the distribution of insects causing cutaneous myiasis during the last century is presented. These subjects are still of interest and a synopsis of new data concerning Hypoderma tarandi, H. diana and Prezhevalskiana silenus is reported as well as the changes of distribution of some species such as Cochliomyia hominivorax. In the second part, an over view of what has been archived on myiasis immunology is reviewed. This is based on the work conducted on Lucilia cuprina and Hypoderma. The areas of research are serological diagnosis, disease monitoring, immunological mechanisms of host protection and parasite escape. The following topic reviewed the latest developments in chemotherapy, the problems associated with this approach to control the myiasis and the part played by these chemicals in successful eradication programs. In the last topic the latest results obtained with the use of biological measures to control C. hominivorax and H. bovis and H. lineatum are reported.

Animals↗
PubMed1991

Some myiasis producers in Cairo and Giza abattoirs.

The most important insects from medical point of view, are the blood suckers or the insect-borne diseases. Still others, almost non-blood suckers, but may attack man and animal to deposit their eggs or larvae causing pathogenic condition known as myiasis. In the present paper, a total of nine myiasis producing dipterous flies were collected from Cairo and Giza abattoirs. They were: Musca d. vicina, Calliphora vicina, Chrysomyia albiceps, C. marginalis, Lucilia sericata, L. cuprina, Sarcophaga haemorrhoidalis, Wohlfahrtia magnifica and Oestrus ovis. Their role as myiasis producers in man and animal was discussed.

Abattoirs↗
PubMed1982

Cutaneous myiasis due to tumbu-fly, Cordylobia anthropophaga in Ilorin, Kwara State, Nigeria.

The occurrence and public health significance of cutaneous myiasis were investigated in Ilorin, Kwara State, Nigeria between June and September, 1981. The findings indicated that human myiasis caused by the maggot of African tumbu-fly, Cordylobia anthropophaga was relatively common and constituted potential public health problems in the affected parts of the state capital. The importance of animal myiasis due to larvae of sheep bot-fly, Oesteris ovis and the cattle grubs, Hypoderma bovis, was assessed and discussed.

Adolescent↗
PubMed1981

[Furuncular myiasis caused by Dermatobia hominis larva].

The imported tropical dermatoses include the various manifestations of dermal myiasis. Cases of the furuncular form of cutaneous myiasis are infrequently seen and occur much more seldom than creeping eruption. Nearly exclusively furuncular lesions appear after infestation with the larvae of Dermatobia hominis, the human botfly, in Central and South America and with the larvae of the tumbu-fly, Cordylobia anthropophaga, in tropical Africa. We had the opportunity to see a patient, who had acquired furuncular myiasis due to Dermatobia hominis in Bolivia and the emergence of his fully developed larvae.

Adult↗
PubMedDate not supplied

[Ocular myiasis (author's transl)].

We must consider: -- Superficial ocular myiasis affecting the lacrymal cul-de-sac and ducts and caused by oestridae larvae growing on conjunctiva or lacrymal ducts. -- Deep ocular myiasis affecting either the eyelids or the ocular globe and due to larvae pertaining to several families of flies and requiring an anaerobic phase in their development. This type of myiasis must be separated in two groups according to their localization in the camera anterior or in the camera posterior. Sometimes larvae are very, numerous and demonstrate a high potential of spreading and a phagedena. Surgical treatments are indicated.

Conjunctiva↗
PubMed1994

[Furuncular myiasis caused by Cordylobia anthropophaga: description of a case from Tanzania].

We report a case of a tourist, coming back from Tanzania, who presented with a foruncle on the left thigh diagnosed as a bacterial infection, which eventually turned out to be a myiasis foruncle. The patient said he had sat on the ground in short trousers. The lesion was covered with petroleum jelly and the larva was observed migrating from the lesion and subsequently extracted with forceps. The morphology of larval spiracles allowed to characterize the species as Cordylobia anthropophaga. Behaviour of the most common myiasis-producing flies, their life cycle and the way of infection are briefly described. Foruncular myiasis is a typical example of a tropical disease that can be misdiagnosed by clinicians in Western Countries where this pathology is uncommon.

Adult↗