Avian influenza in dairy cows in the United States
Infections with highly pathogenic avian influenza virus subtype H5N1 (HPAIV H5N1) clade 2.3.4.4b have been detected at numerous dairy farms in a number of US states. The actual extent of the spread in infected dairy herds in the US is as yet unclear.
The current probability of Switzerland being affected by similar cases is very low. While the general situation continues to be concerning, we are monitoring events in the US closely. The Institute of Virology and Immunology (IVI) is in regular contact with partners in the US as well as other laboratories in Europe.