Keratinolysis by poultry farm soil fungi |
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Authors: | Kaul S Sumbali G |
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Institution: | (1) Department of Dermatology (Skin Mycology), Madras Medical College, Madras-, 600 003, India;(2) Department of Microbiology, DR.ALM PG Institute of Basic Medical Sciences, Taramani, Madras-, 600 113, India |
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Abstract: | Two hundred and eleven dogs (including strictly house and stray dogs) and 170 cattle in and around the city of Madras, India
were screened for the presence of dermatophytosis. 106 strains of dermatophytes (89 strains from dogs and 17 strains from
bovines) were isolated. 57/106 strains were Trichophyton mentagrophytes var. mentagrophytes and 42/106 strains were of the
Microsporum gypseum complex. 5 strains of T. rubrum and 2 strains of T. simii were also obtained in culture. A predominance
of M. gypseum complex isolates was recorded in stray dogs and cattle and T. mentagrophytes var. mentagrophytes and T. rubrum
in strictly house dogs. The family history of the owners of the most of the dogs had clear records of dermatophytosis. Further,
the owners of the 11 dogs that yielded T. mentagrophytes var. mentagrophytes had either tinea corporis or tinea pedis. The
etiological agent of all the 11 human cases was T. mentagrophytes var. interdigitale. Similarly the owners of 4 of the 5 dogs
that yielded T. rubrum were known T. rubrum patients. All these patients responded to oral griseofulvin or ketaconozole, but
the recurrence of lesions was noted with the cessation of treatment. None of the patients had onychomycosis and the family
history of all the patients revealed no reports of T. rubrum infections. The pet dogs were presumed to be the source of re-infection.
Reversed transmission of dermatophytes from humans to animals may be the reason for the selective predominance of these organisms
in strictly house dogs. They also may act as sources of reinfection. Most of the animals had small, occult, scattered lesions.
These lesions may either go unnoticed or are ignored by the owners of the animals. The taxonomic status of T. mentagrophytes
var. mentagrophytes and T. mentagrophytes var. interdigitale was aligned to their teleomorph Arthroderma vanbreuseghemii.
Our study suggests that the periodic screening and medication of all live-stock are essential for the prevention and management
of the public health problem caused by dermatophytes.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | animal ringworm dermatophytes Microsporum Trichophyton |
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