Molecular analysis reveals that a particular type of herpesvirus, one of the most ubiquitous human viruses, integrates into a host's chromosomes and can likely be transmitted to offspring. By age two, more than 90% of children are infected with human herpesvirus HHV-6. The infection often causes a rash commonly referred to as roseola and then establishes latency in the host, typically not reappearing unless the person becomes immunocompromised.
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