Abstract
Malignant catarrhal fever virus (MCFV) was isolated from nasal and ocular secretions of wildebeest calves up to 3 months old. The virus was also isolated from explant cultures of cornea and nasal turbinates. It is suggested that MCFV replicates in the cornea and turbinates of young wildebeest calves less than 4 months old. MCFV was not isolated from secretions of calves older than 3 months, but virus neutralizing antibodies were found in their nasal secretions. The appearance of antibodies in the nasal secretions coincided with the cessation of virus shedding. The failure of calves over 3 months old to shed MCFV might explain the seasonal nature of bovine MCFV infection.
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