Masking of two in vitro immunological assays for Mycobacterium bovis (BCG) in calves acutely infected with non‐qctopathic bovine viral diarrhoea virus

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Abstract
Acute infection of calves, previously vaccinated with bacille Calmette-Guerin (BCG), with non-cytopathic viral diarrhoea virus (BVDv) resulted in the temporary suppression of two in vitro assays used to monitor Mycobacterium bovis infection. Lymphocyte proliferation and interferon-γ production by whole blood cultures containing purified protein derivatives prepared from Mycobacterium avium (PPD-A) and M bovis (PPD-B) were markedly suppressed. The implication is that acute infections of cattle with non-cytopathic BVDV may temporarily compromise diagnostic tests for M bovis infections and result in a failure to identify cattle with tuberculosis.