Heterologous infectious bronchitis virus vaccine plus Nigella sativa and β-glucan enhance broiler protection against variant II by lowering viral shedding and tissue damage

异源传染性支气管炎病毒疫苗联合黑种草和β-葡聚糖，可通过降低病毒排出量和组织损伤，增强肉鸡对II型变异株的保护作用。