Once the HIV virus becomes resistant to a drug, that resistance is permanent. Drug resistance in HIV-infected children makes finding an effective treatment more difficult.

An outbreak of harmful E. coli found in contaminated raw clover sprouts is being investigated in the states of Idaho and Washington, where health officials are trying to identify how far the outbreak has spread and how to contain it.

When preparing to take a plane ride, many people pack items like magazines or snacks to help pass the time. There may be another item people should remember to pack — antibacterial wipes.

Humans are teeming with viruses and bacteria, both good and bad. It seems one such invader — the human papillomavirus (HPV) — may be infecting many of us.

People at high risk for developing HIV can now take a medication to help prevent the disease. But to get the greatest protection from this medication, strict conditions must be followed.

People from around the world will be flocking to Brazil this summer for the World Cup. But a new study has warned that soccer fans should be aware of the mosquito-borne illness dengue fever.

For many, it doesn't get much better than biting into a hot, juicy hamburger! But for patients in the latest E. coli outbreak, a meal of ground beef might have lead to an unpleasant illness.

People can experience shortness of breath at high altitudes or after intense exercise. But shortness of breath also can be a sign of an underlying health issue with serious consequences.

Officials have been monitoring the situation since the first case of MERS was reported in the US earlier in May. Now, a close contact of this patient has tested positive for the virus.

Some parents may feel it's better to delay their children's vaccines instead of following the officially recommended schedule. But that could present more risks from side effects.