1. Swedish Institute for Infectious Disease Control, Solna, SwedenKarolinska Institutet, Stockholm, SwedenThese authors contributed equally to this article.
2. Swedish Institute for Infectious Disease Control, Solna, SwedenThese authors contributed equally to this article.
3. Swedish Institute for Infectious Disease Control, Solna, SwedenKarolinska Institutet, Stockholm, Sweden
4. Swedish Institute for Infectious Disease Control, Solna, SwedenSwedish Defence Research Agency, Umeå, SwedenSwedish University of Agricultural Sciences, Umeå