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Results for “Persistent Infection”

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PubMed1983

Experimental inoculation of cattle with bovine herpesvirus-4: evidence for a lymphoid-associated persistent infection.

A strain of bovine herpesvirus-4 isolated from cows with mammary pustular dermatitis was used for experimental inoculation of cattle. This strain is serologically indistinguishable from the group prototype Movar 33/63 and from strain DN-599. Seronegative cattle were inoculated IV or by simultaneous intranasal, IV, intramammary (via teat channel), and intradermal inoculations. All inoculated cattle seroconverted. Clinical signs of disease or lesions were not evident, except for a dermal lesion corresponding with one intradermal inoculation site. Virus was recovered from the dermal lesion and was excreted in the milk for 17 days. Virus was recovered from esophagopharyngeal fluid at 9 and 13 days after inoculation. At different times of euthanasia (2 to 14 months after inoculation), virus was recovered from cocultures with bovine lung cells and/or explant cultures of lymph nodes, spleen, tonsils, and, in one case, kidney. In 2 animals, the virus was recovered repeatedly during 1 year from peripheral blood leukocytes by cocultivation with bovine lung cells. The number of infectious leukocytes, as determined by infectious center assay, ranged from less than 1 to 6 infectious cells/10(7) leukocytes.

Animals↗
PubMed1980

Immune mechanisms against canine distemper. III. Role of complement lysis in the immunity and persistent infection of canine distemper virus.

Antibody-mediated complement lysis of Vero cells and canine macrophages infected with canine distemper virus (CDV) was demonstratee in an in vitro 51Cr release assay. This cytolytic activity was found to be highly efficient and was optimal under conditions which favoured the capping of redistribution of surface viral antigens. A prozone was observed in the presence of high antibody concentration and could not be eliminated by repeated washings. By tagging antibody-coated target cells with 125I-labelled staphylococcus protein A, it was found that the extent of protein A binding was parallel to the degree of cytotoxicity suggesting that the mechanism of this prozone effect was similar to that of a precipitation test.

Animals↗