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Table 3 Statistics of chickens challenged with MDV SD 2012-1 isolate

From: Isolation and analysis of a very virulent Marek’s disease virus strain in China

Group Bird number Death with tumor Tumor lesion Total (%)
no vaccine 30 9 13 22 (70.3%)
HVT 30 8 12 20 (66.7%)
HVT + SB1 30 8 10 18 (60%)