As a point of interest, I found positive serological evidence in the sera
of Canadians in 1984 (CJM 30:9, 1137) to KHF and this probably implies
that KHF-like strains have existed here for a long time.
D.A. McLeod, LCDC, Ottawa, Canada
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(e-mail dmcleod at hpb.hwc.ca)