HPAI A(H5N1) cat outbreak, Poland 2023
In June 2023, a fatal disease outbreak affected cats in Poland. Out of 47 cases tested, 29 were positive for highly pathogenic avian influenza (HPAI) A (H5N1) virus, identified as clade 2.3.4.4b with genetic mutations suggesting initial adaptation to mammalian hosts. The cat viral sequences (n = 21) showed high similarity, indicating a potential common infection source. To explore possible infection routes, scientists examined food samples from affected households. They found HPAI H5N1 virus in one poultry meat sample. This sample originated from a private refrigerator of one cat owner, but its source couldn't be confirmed. It's crucial to consider the possibility of contamination post-butchery, during transport, or within the household. The meat samples were sourced from households with reported severe cat illnesses. However, conclusive identification of HPAI H5N1 infection in these cases is pending. Also, it's important to note that the analyzed meat samples may not have been the sole type of meat consumed by these cats.
