Age of cattle as related to resistance to infection with Mycobacterium paratuberculosis.

摘要: Two 1-month-old calves, four 9-month old and 4 adult (5 to 11 years old) cattle were exposed Mycobacterium paratuberculosis. At 150 days after exposure, all killed necropsied, at that time, tissues of the calves had more bacilli lesions than did 9-month-old or cattle. All responded immunologic tests during experiment.