Screening of risk populations has demonstrated a low rate of seropositivity (<1%). This suggests that hantavirus infection rarely produces asymptomatic illness and that even in risk populations, hantavirus infection is a rare disease.[59]Smith HM, Reporter R, Rood MP, et al. Prevalence study of antibody to ratborne pathogens and other agents among patients using a free clinic in downtown Los Angeles. J Infect Dis. 2002;186:1673-1676.
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