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Volume 15, Number 1—January 2009

Dispatch

Predicting High Risk for Human Hantavirus Infections, Sweden

Gert E. OlssonComments to Author , Marika Hjertqvist, Åke Lundkvist, and Birger Hörnfeldt
Author affiliations: Swedish Institute for Infectious Disease Control, Solna, Sweden (G.E. Olsson M. Hjertqvist, Å. Lundkvist); Swedish University of Agricultural Sciences, Umeå, Sweden (G.E. Olsson); Swedish Defence Research Agency, Umeå (G.E. Olsson); Karolinska Institutet, Stockholm, Sweden (Å. Lundkvist); Umeå University, Umeå (B. Hörnfeldt)

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Appendix Figure

Human cases of hemorrhagic fever with renal syndrome (HFRS) per month from HFRS-endemic Västerbotten County, Sweden, July 2004 through June 2008, and measured snow depth at 3 locations through February 2008. The season 2004–05 represents the most recent epidemic peak year, before the large outbreak of 2006–07; 2005–06 represents an ordinary low-incidence season. The exceptional increase of HFRS cases in midwinter 2006–07 followed a rapid snowmelt and complete loss of protective snow cover to the

Appendix Figure. Human cases of hemorrhagic fever with renal syndrome (HFRS) per month from HFRS-endemic Västerbotten County, Sweden, July 2004 through June 2008, and measured snow depth at 3 locations through February 2008. The season 2004–05 represents the most recent epidemic peak year, before the large outbreak of 2006–07; 2005–06 represents an ordinary low-incidence season. The exceptional increase of HFRS cases in midwinter 2006–07 followed a rapid snowmelt and complete loss of protective snow cover to the voles during December 2006 in inland and coastal areas. Similarly, the less pronounced increase in midwinter 2007–08 followed a less abundant loss of snow cover only in the coastal area.

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