Endogenous human herpesviruses 6A/B.

Human herpesviruses 6A and 6B (HHV-6A/B) can integrate into the germline, resulting in inherited viral DNA-now proposed to be called "endogenous HHV-6A/B (eHHV-6A/B)." Present in 0.2-3% of humans, this integrated DNA is passed to offspring and may reactivate, posing health risks such as angina or lupus. To reduce confusion caused by varied terminology, researchers advocate using "eHHV-6A/B" for inherited forms and reserving "chromosomally integrated" for somatic integrations only.