However, the most reliable way to define primary and secondary dengue infection is based on a combination of multiple laboratory tests (virus isolation and/or detection of virus RNA by PCR, IgM and IgG antibody detection) performed on blood specimens collected at two time points, at least.
Virus isolations were performed under Biosafety Level 3 containment.
Overall, virus isolations were successful in 14% of the specimens.
Serological evidence and virus isolations have demonstrated widespread distribution of the virus in Senegal.
In order to make meaningful comparisons of sequence data derived from tissue culture adapted isolates of BTV, it is important to know the effect that virus isolation and multiple passage in embryonated chicken eggs and mammalian cell cultures may have on the RNA sequence of individual genome segments.
It was not a particular objective of this exercise to identify the minor causative agents known to be associated with HFMD and hence we did not include multiple cell lines as part of our virus isolation protocol.
As noted above, influenza virus isolation rates decreased, but since multiple measures were implemented, the contribution of mask use, if any, is uncertain (20 ).
Of 4,119 samples processed for virus isolation, influenza A viruses were isolated from 134.
Third, detection of H7N9 virus RNA does not directly translate into risk for transmission of the virus; transmission depends on multiple factors, such as virus viability (as assessed by virus isolation), infectious virus load, and mode and frequency of contact with different market environments.
Recent serologic and virus isolation studies have shown that cats are susceptible to multiple influenza viruses, e.g., avian-origin canine influenza (H3N2) (11 ), seasonal influenza A(H1N1), and influenza A/H1N1 pdm09 (12 ) viruses.
