“…Their limit of detection (LOD) is higher by 3–4 orders compared to PCR techniques, being more than 10 6 viral particles per mL (VP/mL) [ 7 , 8 , 9 , 10 ]. A number of extremely sensitive techniques have been developed, but they have not been optimized for routine usage because of long-lasting sophisticated sample preparation and/or usage of expensive high-technology equipment [ 3 , 12 , 13 , 14 , 15 ]. The development of simple, rapid and sensitive techniques for virus determination is in progress [ 3 ].…”