Coccidioides imitis a. Mainly affects cattle, horses, sheep, pigs b. Granulomas of the lungs, disseminated granular abscesses, posterior mediastinal and bronchial lymph nodes C. Opportunistic Mycoses - generally related to decreased host resistance, antibiotic therapy, and immune suppression 1. In birds causes thrush - ulcers of the mouth, crop, proventriculus, and gizzard with a high mortality rate 2. Cryptococcus neoformans a. Is an encapsulated yeast that produces encephalitis and granulomas b. Interferes with antigen presentation iii.
Free capsule is found disseminated throughout the body iv.
Induce suppressor T cells which down regulate the immune response e. Produces melanin and mannitol which act as anti-oxidants f. Dogs and cats are susceptible. In cats it is frequently associated with the nasal turbinates 3. Aspergillus fumigatus a. Causes pneumonia in birds 4.