Authors
AGNIESZKA FIGAS
National Institute of Public Health – National Institute of Hygiene, Department of Virology, Warsaw, Poland
MAGDALENA WIECZOREK
National Institute of Public Health – National Institute of Hygiene, Department of Virology, Warsaw, Poland
BOGUMIŁA LITWIŃSKA
National Institute of Public Health – National Institute of Hygiene, Department of Virology, Warsaw, Poland
WŁODZIMIERZ GUT
National Institute of Public Health – National Institute of Hygiene, Department of Virology, Warsaw, Poland