A retrospective study of Trichophyton mentagrophytes infection in dogs (1970-2002) (original) (raw)
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Dermatophytosis caused by Trichophyton mentagrophytes var. erinacei in a dog: a case report
2014
Trichophyton mentagrophytes var. erinacei is rarely isolated from dogs with dermatophytosis. It is a zoophilic dermatophyte transmitted by hedgehogs and, in contrast to other dermatophyte species, is characterised by a severe suppurative and inflammatory response known as kerion. A 5-year-old male mongrel dog was referred to the Veterinary Teaching Hospital with a 2-week history of a localised pruritic and suppurative alopecic lesion on the scrotum. Routine blood tests, peripheral blood smears, multiple skin scrapings and bacteriological culture did not reveal any abnormalities. However, Trichophyton mentagrophytes var. erinacei was isolated from a fungal culture. The presence of hedgehogs around the daily walking areas of the dog suggested the possibility of direct or indirect contact of the dog with hedgehogs. Fungicidal treatment was implemented with oral itraconazole (5 mg/kg once daily) and topical application of clotrimazole (twice daily) for a month. The scrotal lesion healed completely and hair grew back within a month. No recurrence occurred during a 4 month follow-up. T. mentagrophytes var. erinacei should be included in the differential diagnosis of suppurative scrotal skin lesions of dogs, which have come into possible contact with hedgehogs.
Dermatophytes isolated from symptomatic dogs and cats in Tuscany, Italy during a 15-year-period
Mycopathologia, 2003
Between January, 1, 1986 and December, 31, 2000, dermatological specimens from 10.678 animals (7.650 cats and 3.028 dogs) were examined for dermatophytes. All the animals presented clinical signs of ringworm. Two thousand-four hundred fifty-six of the 10.678 (23%) examined animals scored positive for dermatophytes, 566 out of 3.028 canine (18.7%) and 1890 out of 7.650 feline specimens (24.7%). Microsporum canis constituted 83% and 97% of the isolated dermatophytes respectively in dogs and cats, M. gypseum represented 13% and 2.6% and T. mentagrophytes 5.5% and 0.2%. A sexual predisposition for mycotic infections was not observed. The animals with less than 1 year of age were more frequently infected. Canine toy breeds showed a significantly higher (P < 0.001) prevalence of infections by M. canis. Microsporum gypseum was mostly recorded from sporting (hunting) breeds [such as T. mentagrophytes (6.7%)]. Microsporum canis was isolated from long-haired cats with a ratio of 2:1 versus short-haired cats, while M. gypseum and T. mentagrophytes were never recovered from Persian cats. The annual distribution of the infections in dogs showed a significantly higher incidence for M. gypseum in summer versus winter and spring, while the recovery rate of M. canis from cats was very significantly higher in fall and winter than in summer and spring. Trichophyton mentagrophytes did not show a similar seasonal distribution.
2012
Aim: Ring worm are fungal infection relevant to animal and human health. The study was aimed to assess the frequency of dermatophytes infection of the skin of dogs in and around the Jaipur city. Materials and methods: One twenty canine samples were obtained during three years (2008-2011) from dogs suffering from different dermatological disorders and were invitro processed for dermatophytes detection at the Department of Microbiology, Apollo College of veterinary medicine Agra Road, Jaipur. Result: Out of these, eighty nine samples were positive respectively for Microsporum gypseum 55.83%, Trichophyton mentagrophytes 18.3% and other fungal isolate Alternaria spp. sporadic in 15 samples (0.12%). Retrospective studies of dermatophytosis due to Microsporum and Trichophyton were performed with the sole consideration of public health consequence of the canine ringworm. Conclusion: In the present study samples were found positive for Microsporum gypseum 55.83%, Trichophyton mentagrophytes 18.3% and other fungal isolate Alternaria spp. Considering the veterinary and public health importance of canine ringworm it would be necessary to assess the prevalence of the dermatophytosis in Rajasthan.
Zoonoses and Public Health, 2007
Trichophyton mentagrophytes var. erinacei is rarely isolated from dogs with dermatophytosis. It is a zoophilic dermatophyte transmitted by hedgehogs and, in contrast to other dermatophyte species, is characterised by a severe suppurative and inflammatory response known as kerion. A 5-year-old male mongrel dog was referred to the Veterinary Teaching Hospital with a 2-week history of a localised pruritic and suppurative alopecic lesion on the scrotum. Routine blood tests, peripheral blood smears, multiple skin scrapings and bacteriological culture did not reveal any abnormalities. However, Trichophyton mentagrophytes var. erinacei was isolated from a fungal culture. The presence of hedgehogs around the daily walking areas of the dog suggested the possibility of direct or indirect contact of the dog with hedgehogs. Fungicidal treatment was implemented with oral itraconazole (5 mg/kg once daily) and topical application of clotrimazole (twice daily) for a month. The scrotal lesion healed completely and hair grew back within a month. No recurrence occurred during a 4 month follow-up. T. mentagrophytes var. erinacei should be included in the differential diagnosis of suppurative scrotal skin lesions of dogs, which have come into possible contact with hedgehogs.
Detection and characterization of zoonotic dermatophytes from dogs and cats in and around Kolkata
Veterinary World, 2015
The ringworms of pet dogs, cats, and stray animals (dogs, cats, and other animals) could be a potential source of zoonotic infections causing a serious public health problem in the busy city Kolkata. The pet owners are more susceptible to get this infection from their pets, because of the close contact with them as dermatophytosis is very much prevalent in those pets. So, this study was aimed to check the prevalence of dermatophytosis in dogs, cats, and in pet owners. Materials and Methods: A total of 362 clinically suspected cases of dermatophytosis from dogs (123 in number), cats (202 in number), and human beings (37 in number) were collected and studied from in and around Kolkata to detect the presence of significant dermatophytes. Direct microscopy and cultural examination of the isolates were performed following standard methodology. Identification and characterization of the isolates were done by different biochemical tests. Results: Samples (n=285) having significant dermatophytic fungal infections were found to be of highest number in cats (158, 55.5%) than in dogs (108, 37.8%) and humans (19, 6.7%), respectively. The incidence of Microsporum canis (60.0%) was the highest from affecting dogs, cats, and human beings in comparison to Microsporum gypseum (22.5%), Trichophyton mentagrophytes (15.8%) and Trichophyton rubrum (1.7%). Detection of T. rubrum was only from human cases in this study, whereas the presence of rest three were slightly higher in cats than that of the dogs and humans in this present study. The incidences were higher in young animals and in humans of the age group of 21-30 years, during the rainy season (from April to August) and also in in-contact human beings. Conclusion: M. canis was the most commonly pathogen among all causing dermatophytosis in animals and also in the pet owners. M. gypseum and T. mentagrophytes were other pathogens associated with these infections. These infections were more prevalent in the rainy seasons and in in-contact human patients or pet owners.
Isolation of Trichophyton verrucosum from Rabbit Infected with Dermatophytosis
Journal of Advances in Medicine and Medical Research, 2018
Dermatophyte infection or ringworm is a superficial cutaneous infection with one or more of the fungal species of the keratinophilic genera Microsporum, Trichophyton, or Epidermophyton and is a zoonosis with a great impact on public health. Three skin scraping were collected from suspected clinical cases of rabbits aged 6 months. Samples were directly examined in 20% KOH and cultured in Sabouraud's dextrose agar. The developed colonies were identified by conventional methods. The dermatophyte isolated was Trichophyton verrucosum.
Isolation of dermatophytes from dogs and cats with suspected dermatophytosis in Western Turkey
Preventive Veterinary Medicine, 2011
The aim of this study was to determine the species of dermatophytes isolated from dogs and cats and their prevalence in the two big provinces of Western Turkey. A total of 362 animals (198 dogs and 164 cats) with skin lesions (alopecia and desquamation) were examined from March 2006 to February 2008. Of the 362 samples examined, 52 (14.4%) were positive for fungal elements by direct microscopic examination, and 70 (19.3%) were culture positive for dermatophytes. The isolation rates of dermatophyte species from dogs and cats were 18.7% and 20.1%, respectively. Microsporum canis (57.1%) was the most common species isolated from dogs and cats. The prevalence of Trichophyton mentagrophytes was five-fold greater in dogs than in cats (odds ratio = 5.226; CI = 1.152-23.696). No association was detected between prevalence of infection and provinces, and also sex of dogs and cats. The only risk factor found to be significantly associated with infection was age. Dogs and cats younger than one year of age showed a statistically significant higher prevalence of dermatophytes than other age groups (P < 0.05). The isolation rate of dermatophytes was relatively high in the spring and winter for dogs, and in the spring, summer and autumn for cats. However, the association of season and prevalence was found not to be significant.
Tinea corporis caused by Trichophyton equinum transmitted from asymptomatic dogs to two siblings
Brazilian Journal of Microbiology, 2019
Each year, millions of people worldwide are affected by superficial mycoses, which are frequently caused by dermatophytes having affinity to the scalp, nails, hair and the stratum corneum of the skin. The changing reservoirs of zoophilic dermatophytes, the numerous reports of animal carrier status, and the increasing number of pets make the diagnosis difficult, which is usually impossible based only on medical history. Herein we present a case report of tinea corporis caused by Trichophyton equinum in siblings who had no contact with horses. The routine laboratory diagnostic procedures for identification of isolates were based on phenotypic and genotypic characteristics, especially molecular techniques using rDNA internal transcribed spacer sequences. The results showed that both techniques proved to be insufficiently discriminatory to differentiate two closely related species, i.e. Trichophyton equinum and Trichophyton tonsurans. Introduction of a TEF1 sequence analysis to the diagnostic procedures revealed consistent differences between these two species and facilitated unambiguous identification. Interestingly, dogs that could leave the homestead freely were the source of the infection in children. In conclusion, Trichophyton equinum was considered in the past as a strict zoophilic dermatophyte associated with horses and rarely transmitted to humans. This study revealed that this species can have other reservoirs and live in the fur of asymptomatic animals.