A review by scientists found that of the near 90 million doses of H1N1 flu vaccine administered in 2009-2010 in China, no pattern of serious side effects has emerged.

When there is an outbreak of flu or other epidemics, selective school closures are considered one way to reduce the number of cases. However, new research shows that this limited tactic may be ineffective.

Obesity contributes to many health complications. However, a new study by Spanish researchers suggests that obesity may not increase the risk of death among people with swine flu.

Liver cancer patients who are HIV-positive and waiting for a liver transplant are less likely to receive the surgery, according to new research from France.

A study from South Korea has found a link between the Hepatitis A virus and patients with pre-existing chronic liver disease and identified the age group most at risk.

During both the 2009 H1N1 flu epidemic and the whooping cough outbreak in California, elderly Hispanics had high rates of infection. New research suggests this might be due to low vaccination rates and language.

Cancers of the tonsil and base of the tongue have increased in the U.S. among middle-aged and young adults, most of which are related to human papillomavirus (HPV).

The Candida albicans fungus, which is the leading cause of infection in people with suppressed immune systems, spreads so easily due to its "promiscuous" nature.

Older Hispanic seniors are less likely to receive immunizations against the flu and pneumonia, according to a recent study by the RAND Corporation.

Metal oral piercings (as opposed to plastic) may increase the risk of bacterial infection, according to a study published in the Journal of Adolescent Health .