Those buzzing mosquitos are annoying and their bites cause an uncomfortable itch. But when the West Nile virus is involved, mosquito bites can be more than just annoying.

Ohio is in the midst of an outbreak of Legionnaire's disease, a serious illness caused by the bacteria Legionella .

When H7N9, a strain of bird flu, began infecting people in China last spring, officials and scientists worldwide tried to quickly learn more about this new virus.

Officials have been working to pinpoint the source of a foodborne parasite that has been causing illness across the US this summer. Now they may have found one culprit.

There has been concern in the news lately about viruses spreading at large public gatherings. But these viruses might just as easily spread right in the hospital.

We expect to go into the hospital to get better, not to become sicker. But sometimes hospital patients get infections that they didn't have before going to the hospital for treatment. And these infections could be costly.

HHV-6 is the common name for two viruses which nearly every human has had by their second birthday. Some people are born with a strain of HHV-6 virus that is inherited from a parent. This inherited HHV might offer a clue to chronic fatigue symptoms.

The foodborne parasite Cyclospora has been causing infections across the US this summer, leaving authorities searching for a culprit.

Vaccines protect people from diseases. Pregnant women who get vaccinated can pass on that protection to their developing babies. And it seems some of that protection may last even after birth.

The parasite Cyclospora has caused illnesses in multiple states across the US this summer, and officials are still investigating how it is spreading.