1. August Kirchenstein Institute of Microbiology and Virology, Riga Stradins University, Ratsupites Street 5, LV-1067 Riga, Latvia
2. Department of Infectology and Dermatology, Riga Stradins University, Linezera Street 3, LV-1006 Riga, Latvia
3. Department of Neurology and Neurosurgery, Riga Stradins University, Pilsonu Street 13, LV-1002 Riga, Latvia