H5 bird flu, a type of avian influenza, has infected dozens of people in the U.S., and spread to seven states and Canada this year. As more human cases arise, there's deepening worry over whether the ...

Doctors and health officials are warning San Diego residents about rising cases of whooping cough and walking pneumonia, especially among young children.

A surge in whooping cough cases in Oregon has prompted state and local health officials to urge residents to get vaccinated.