Finnish health agency says hantavirus quarantine cases unlikely to have infected others

The two Finns placed in quarantine over possible hantavirus exposure have shown no symptoms, and health authorities consider the risk of onward transmission extremely low, the Finnish Institute for Health and Welfare (THL) stated Wednesday.

THL infectious disease specialist Liina Voutilainen told national broadcaster Yle that the two individuals—exposed on 25 April during a flight—have remained asymptomatic throughout the 18-day monitoring period. Half of hantavirus cases typically develop symptoms within this timeframe, she noted, with infection risk diminishing thereafter.

“It is unlikely they have exposed others,” Voutilainen said, adding that contact tracing for Andes-type hantavirus covers only the two days prior to symptom onset.

Finland classified hantavirus as a generally hazardous communicable disease on Monday, enabling officials to impose a 42-day quarantine on the exposed individuals. Quarantine orders fall under the authority of regional welfare agencies.

Authorities stress that the overall infection risk in Finland remains very low, with no confirmed cases reported.