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Journal of Clinical Microbiology, May 1997, 1090-1096, Vol 35, No. 5
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Puumala hantavirus genome in patients with nephropathia epidemica: correlation of PCR positivity with HLA haplotype and link to viral sequences in local rodents

A Plyusnin, J Horling, M Kanerva, J Mustonen, Y Cheng, J Partanen, O Vapalahti, SK Kukkonen, J Niemimaa, H Henttonen, B Niklasson, A Lundkvist and A Vaheri
Department of Virology, Haartman Institute, University of Helsinki, Finland. Alexander.Plyusnin@helsinki.fi

Reverse transcription-PCR was used to analyze specimens from 20 Finnish nephropathia epidemica (NE) patients hospitalized during the period from October 1994 to January 1995. Blood and/or urine sediment specimens from seven patients were found to be positive for the genome sequences of Puumala hantavirus (PUU). PCR positivity of the specimens from the patients correlated well with the HLA-DRB1*0301 and HLA B8 alleles, which previously were shown to associate with severe courses of NE. Genetic analysis of the partial M-and/or S-segment sequences obtained from three severely ill NE patients revealed three PUU strains related to but distinct from previously reported strains from Finland. The M-segment sequence of PUU from bank voles trapped near the probable site of infection for one of the patients showed 98.2% identity to that of the PUU strain obtained from the patient, suggesting a link between wild-type PUU from the natural focus and the NE case. The S-segment sequences from the patient and the bank voles, however, showed substantially lower identity (95.8%). As this difference in diversity for M and S genes (1.8 and 4.2%) is atypical for PUU genetic drift, one possibility is that the strain acquired at the putative place of infection is a reassortant one.

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