While I haven't dived deep into this topic according to this article viral seasonality tracks with the migration of wild birds: https://pubmed.ncbi.nlm.nih.gov/

While I haven't dived deep into this topic according to this article viral seasonality tracks with the migration of wild birds: https://pubmed.ncbi.nlm.nih.gov/27324078/ https://pubmed.ncbi.nlm.nih.gov/27324078/