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Bars represent the total number of samples and the red line the total number of positive results for free-range and backyard between 2012 and 2020. |
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| Part of: Kirov PM, Alexandrova RI (2022) Evaluation of viral infection levels in intensive and organic poultry farming. In: Chankova S, Peneva V, Metcheva R, Beltcheva M, Vassilev K, Radeva G, Danova K (Eds) Current trends of ecology. BioRisk 17: 287-296. https://doi.org/10.3897/biorisk.17.77398 |