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Journal Article Reply Get access Kirsi Skogberg, Kirsi Skogberg Department of Bacteriology and Immunology, University of Helsinki; Department of Medicine, Helsinki University Central Hospital; and National Public Health Institute, Helsinki, Finland Reprints or correspondence: Dr. Kirsi Skogberg, Department of Bacteriology and Immunology, P.O. Box 21 (Haartmaninkatu 3), 00290 Helsinki, Finland. Search for other works by this author on: Oxford Academic PubMed Google Scholar Matti Jahkola, Matti Jahkola Department of Bacteriology and Immunology, University of Helsinki; Department of Medicine, Helsinki University Central Hospital; and National Public Health Institute, Helsinki, Finland Search for other works by this author on: Oxford Academic PubMed Google Scholar Petri Ruutu, Petri Ruutu Department of Bacteriology and Immunology, University of Helsinki; Department of Medicine, Helsinki University Central Hospital; and National Public Health Institute, Helsinki, Finland Search for other works by this author on: Oxford Academic PubMed Google Scholar Ville Valtonen Ville Valtonen Department of Bacteriology and Immunology, University of Helsinki; Department of Medicine, Helsinki University Central Hospital; and National Public Health Institute, Helsinki, Finland Search for other works by this author on: Oxford Academic PubMed Google Scholar Clinical Infectious Diseases, Volume 17, Issue 1, July 1993, Page 144, https://doi.org/10.1093/clinids/17.1.144 Published: 01 July 1993