👉 H5N4 is a highly pathogenic strain of avian influenza, a type of bird flu that affects birds and humans. It was first identified in 2003 in chickens in China and has since spread to many countries worldwide, including the United States, where it caused an outbreak in 2017. The H5N4 virus is known for its ability to mutate rapidly, making it highly contagious and dangerous. Symptoms typically include fever, coughing, and difficulty breathing
