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.

The transmission of reticuloendotheliosis viruses from mammals to birds was most likely an unexpected consequence of medical research.

Bone marrow transplants appear to have eliminated HIV from Boston cancer patients.

A clinical trial will test the strategy a Mississippi doctor used to cure an infant.

The virus was largely stomped out in adults who started treatment soon after infection.

Viral DNA in mice genomes may lead to cancer in immune-compromised animals.

Researcher who found connection between virus and chronic fatigue fired for not releasing her research samples.

Researchers publish yet another study against the link between a murine leukemia virus and chronic fatigue syndrome, and partially retract the original results.