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. 1973 Nov;8(5):715–724. doi: 10.1128/iai.8.5.715-724.1973

Pathogenesis of Marek's Disease in Old Chickens: Lesion Regression as the Basis for Age-Related Resistance

J M Sharma 1, R L Witter 1, B R Burmester 1
PMCID: PMC422917  PMID: 4584047

Abstract

Chickens of various age levels, free from prior infection, were simultaneously exposed to Marek's disease virus, and the response of each age group was recorded. Four- and 20-week-old chickens of lines 15×7 and CM (commercial source) had substantial resistance to mortality and gross lesions. In contrast, in line 7, which was tested at 1-day, 2-, 4-, 8-, 12- and 16-week age levels, 4-week-old chickens were fully susceptible to clinical Marek's disease (MD), although resistance was demonstrated at 8-week and older age levels. Genetically resistant chickens of line 6 maintained their resistance at all age levels tested. Pathogenesis of MD was compared in 12-week-old and 1-day-old chickens of line 15×7. Within the 1-day-old group, 23% of the chickens died because of MD, whereas there were no deaths in the 12-week-old group. Both groups developed viremia although duration, incidence, and levels of virus in the 1-day-old group were higher than in the 12-week-old group. Although initially the 12-week-old group responded by producing higher levels of antibody, the long term incidence of agar gel precipitin, immunofluorescent, and virus neutralization antibody in the two groups was similar. Gross and microscopic lesions of MD developed in both groups, but lesions regressed in the 12-week-old group and persisted in the 1-day-old group. It was concluded that age resistance to MD was expressed through lesion regression.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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