BLUETONGUE IN CATTLE - EFFECTS OF VECTOR-TRANSMITTED BLUETONGUE VIRUS ON CALVES PREVIOUSLY INFECTED IN UTERO

  • 1 January 1977
    • journal article
    • research article
    • Vol. 38  (11) , 1697-1700
Abstract
Three of 7 principal calves, after a challenge of immunity exposure by bites of bluetongue (BT) virus-infected Culicoides variipennis, became latently infected with BT virus. These calves were born to heifers infected with the homologous virus by bites of C. variipennis at 60 or 120 days gestation. Latent BT virus infection was detected by isolation of BT virus from washed erythrocyte samples obtained from the calves at 57, 100-102, 200-202, 300-302 and 400-402 days after challenge of immunity and from 1 of the calves over 5 yr after challenge of immunity. The 3 latently infected calves were healthy; 2 were immunologically competent and 1 was immunologically incompetent to develop detectable BT virus antibodies in their blood. Bluetongue virus infection was detected (by viral isolation) in 2 other principal calves during the challenge of immunity, but they were not considered latently infected. The latter 2 calves were immunologically incompetent to develop detectable BT virus antibodies.

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