This challenge remains because of cross-reactivity among flaviviruses, especially in a context of secondary flavivirus infection or previous immunization.
Routine diagnosis of Flavivirus infections is usually made either through antibody detection by ELISA (enzyme-linked immunosorbent assay) or RT-PCR (reverse transcription polymerase chain reaction), depending on the phase of the disease.
So far, two PRRs, toll-like receptors (TLRs) and retinoic acid-inducible gene I- (RIG-I-) like receptors (RLRs) [18, 19], are identified to have a crucial function in resisting flavivirus invasion.
In addition to the flaviviruses (genus Flavivirus), the family includes 2 other genera, the hepaciviruses (genus Hepacivirus, which includes hepatitis C virus and GB virus B) and pestiviruses (genus Pestivirus, which includes bovine viral diarrhea virus and classical swine fever virus).
Of those 56 patients, 34 (61%) were found to have evidence of either Zika or another related flavivirus. Ten (18%) of those 56 were confirmed to have Zika virus, and 1 patient who received treatment for GBS died of septic shock.