Rheumatoid arthritis patients are commonly treated with anti-TNF medications. As with many arthritis drugs, there are concerns that anti-TNF drugs may lead to some serious side effects.

When California had the highest number of pertussis cases in six decades in 2010, public health officials took notice. Pertussis (whooping cough) is especially dangerous for babies.

There may be more to home field advantage than just familiar surroundings and local fans. Crossing a few time zones more than doubled some athletes’ sick days.

A day at the county fair is one of the hallmarks of summer in America. But you might want to skip the pig races this year: new swine flu cases have been linked to pigs at agricultural fairs.

An outbreak of West Nile virus is one of those summer rituals we don't look forward to. Unfortunately, in some parts of the country, the virus is making itself more present than usual.

Severe sepsis is a life-threatening event that can often leave a patient disabled. Spouses of severe sepsis patients have reported experiencing increased levels of depression.

HIV won't go down without a fight. Even as calls for the “end of AIDS” become stronger and more optimistic, scientists have found that HIV drug resistance is rising in Africa.

A hip or knee replacement may rid you of your arthritis pain. But you may also run the risk of infection after surgery.

Many people are prescribed antibiotics for acute respiratory infections, such as the common cold. But are the antibiotics prescribed doing more harm than good? 

A key to slowing down the spread of HIV is to track the rate of transmission among various subgroups of sexually active individuals. Recent news about one group is sobering.