Characterization of four very virulent Argentinian strains of Marek's disease virus and the influence of one of those isolates on synergism between Marek's disease vaccine viruses.

Abstract excerpt

Isolates of Marek's disease virus (MDV) from vaccinated flocks in Argentina were characterized as very virulent (vv) and very virulent plus (vv+) strains. Experimental infection with these viruses caused a high incidence of Marek's disease in both resistant N-2a line and susceptible P-2a line birds. Vaccine viruses from each of the three Marek's disease viral serotypes were evaluated alone and in various...

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