Untangling the root cause of rheumatoid arthritis has been a difficult task for immunologists, as decades of research has pointed to multiple culprits in our immune system, with contradictory lines of evidence.

Researchers at The Wistar Institute announce the discovery of small molecules that kill cancer cells caused by infection with human papillomavirus (HPV).

One of the major problems that has slowed progress toward universal access to life-saving antiretroviral therapy (ART) to treat AIDS in developing nations has been limited availability of laboratories and trained medical staff to conduct blood tests of immune system CD-4 T-cell levels that indicate when to start ART.

PHILADELPHIA, Sept.

Our immune system is capable of a remarkable feat: the ability to remember infections for years, even decades, after they have first been encountered and defeated.