Clinical trials that target human endogenous retroviruses to treat multiple sclerosis, ALS, and other ailments are underway, but many questions remain about how these sequences may disrupt our biology.

Foamy-like endogenous retroviruses may have emerged more than 450 million years ago, according to an analysis.

Endogenous retroviruses in the human genome can regulate genes involved in innate immune responses.

Researchers uncover evidence that a retrovirus embedded within the human genome may play a role in the pathology of amyotrophic lateral sclerosis. 

A strain of HIV that has afflicted more than 100,000 people emerged from gorillas.

A retrovirus embedded in the human genome may help protect embryos from other viruses, and influence fetal development.

B cells have commandeered ancient viral sequences in the genome to transmit antigen signals.

Researchers use the CRISPR/Cas9 method to remove the virus from the host genome in human cell lines.

The virus is back in two patients in Boston who received bone-marrow transplants and did not have detectable levels of virus for months.