1. Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland
2. Department of Health Security, Finnish Institute for Health and Welfare, Helsinki, Finland
3. Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland; Department of Virology, University of Helsinki, Helsinki, Finland
4. Department of Veterinary Biosciences, University of Helsinki, Helsinki, Finland; Department of Virology, University of Helsinki, Helsinki, Finland; Department of Tropical Parasitology, Institute of Maritime and Tropical Medicine, Medical University of Gdansk, Gdynia, Poland