In the subgroup analysis, when the included studies were classified into two subgroups according to the study period—before and after 2000—the incidence of ILT showed a decreasing trend over time, which may be attributed to strict biosafety measures and scientific breeding to enhance the control of ILT.
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A meta-analysis for prevalence of infectious laryngotracheitis in chickens in mainland China in 1981-2022.
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