(CNN) — In early March, Dr. Barb Petersen, a large-animal vet in Texas, began getting calls from the dairy farms she works with in the Panhandle. Workers there were seeing a lot of cows with mastitis, ...

Cow udders may provide a hotspot for bird flu and human flu viruses to mingle. The prospect of an outbreak of avian influenza among dairy cattle triggering a pandemic in humans is one step closer than ...