Sometimes one public health initiative can have unintended consequences. Could this have happened with the chickenpox vaccine and shingles?

Meningitis cases have been developing at two US universities on opposite coasts. Though students were encouraged not to change holiday travel plans due to these cases, the infections are continuing.

Talk of bird flu may make people a little nervous. So many will likely be relieved to hear that the US government has approved a vaccine to protect against one strain of the virus.

Sometimes it's easy to forget how common many diseases were before vaccines for them were introduced. When the disease is not around, people may not notice as much.

New advancements in HIV treatment have allowed many people to live with a very small amount of the virus in their bodies. But what are the pros and cons?

Infections can be concerning, but that concern becomes much more serious if the infection is resistant to treatment. Researchers are racing to find ways to treat these resistant infections.

Vaccines are made to protect children and adults alike from a host of diseases. Some of these vaccines may protect against more than the disease they were intended to prevent.

In 2009, there were concerns across the world about the H1N1 flu. It turns out that, overall, death rates from this flu pandemic weren't worse than those of other flu seasons — at least for some.

Meningitis outbreaks at two university campuses have gained national attention and led some to question if these outbreaks should lead to a change in students' holiday travel plans.

Infections from MERS are still being discovered at a slow but steady pace. Several new cases have been reported in the Middle East this month.