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Once infected, these mice can become chronically infected by maintaining virus in their blood or persistently shedding virus in their urine. Chronically infected female mice usually transmit infection to their offspring (vertical transmission), which in turn become chronically infected. Other modes of mouse-to-mouse transmission include nasal secretions, milk from infected dams, bites, and during social grooming within mouse communities. Airborne transmission also occurs.The virus seems to be relatively resistant to drying and therefore humans can become infected by inhaling infectious aerosolized particles of rodent urine, feces, or saliva, by ingesting food contaminated with virus, by contamination of mucous membranes with infected body fluids, or by directly exposing cuts or other open wounds to virus-infected blood. The only documented cases of transmission from animals have occurred between humans and mice or hamsters.Cases of lymphocytic choriomeningitis have been reported in North and South America, Europe, Australia, and Japan, particularly during the 1900s. However, infection may occur wherever an infected rodent host population exists. LCMV occurs worldwide and its natural host, the rodent, has become established on all continents, except Antarctica.Seroprevalence is approximately 5% (0.7–4.7%) of the US population. It tends to be more common among lower socio-economic groupings, probably reflecting more frequent and direct contacts with mice. However, obtaining an accurate sense of prevalence by geographic region is difficult due to underreporting. Congenital infection
Lymphocytic choriomeningitis is a particular concern in obstetrics, as vertical transmission is known to occur. For immunocompetent mothers, there is no significant threat, but the virus has damaging effects upon the fetus.