The recent appearance of the H5N1 bird flu in pigs does raise viral reassortment concerns. Here's what we know about this highly pathogenic avian influenza virus so far.

A recent study shows a mild increase in the H4N1 strain of bird flu transmissibility through air compared to older variants.

The developing avian influenza panzootic and the growing possibility of a pandemic bring to the fore the existential questions for humanity of climate change and the destruction of public health, both of which must be stopped in order to control the growing threats.

The Centers for Disease Control and Prevention confirmed the first human case of avian influenza A(H5N1) in a child in California last week.

The U.S. Centers for Disease Control and Prevention on Friday confirmed the country's first case of H5N1 bird flu infection in a child, who experienced mild symptoms and is recovering from their illness.