Experimental candidal mastitis in goats: clinical, haematological, biochemical and sequential pathological studies

The present study, first of its kind, was conducted with the objectives to understand hitherto little known aspects of candidal mastitis, like its sequential pathology, pathogenesis and clinico-biochemical changes. For this purpose, unilateral intramammary inoculation of 10 goats with Candida albicans (1.2 x 10(7) yeast cells) resulted in the development of mastitis, with gross and microscopic lesions being restricted to the infected udder halves only and without dissemination of infection to the opposite uninfected udder halves as well as other organs of the body. The experiment was continued for 40 days and after infection, there was sharp fall in milk yield and Candida albicans was directly demonstrated in the milk and re-isolated from the milk and udder tissues up to 30th day after inoculation. An increase in total immunoglobulins in the milk and plasma along with increase in total plasma proteins were also observed. Haematology revealed leukocytosis and neutrophilia. Microscopically, there was acute purulent mastitis, which later became chronic, nonpurulent and interstitial with formation of granulomas. It was concluded that Candida albicans was highly pathogenic to the lactating goat mammary gland even without immunosuppression or antibiotic treatment, resulting in severe irreversible tissue damage and nearly complete agalactia.