1. Institute of MicrobiologyAcademy of Sciences of the Czech Republic Vídeňská 1083 14220 Prague 4 Czech Republic
2. University of Chemistry and Technology Prague Technická 3 16628 Prague 6 Czech Republic
3. Department of Health Care Disciplines and Population ProtectionFaculty of Biomedical EngineeringCzech Technical University in Prague Nám. Sítná 3105 27201 Kladno Czech Republic