Since 1997, avian outbreaks with some subtypes of influenza A viruses have been reported to cause mostly mild or inapparent infection
To determine the prevalence of inapparent infection
with severe acute respiratory syndrome (SARS) among healthcare workers, we performed a serosurvey to test for immunoglobulin (Ig) G antibodies to the SARS coronavirus (SARS-CoV) among 1,147 healthcare workers in 3 hospitals that admitted SARS patients in mid-May 2003.
West Nile virus (WNV) is an arbovirus in the Flaviviridae family, which may cause inapparent infection
, mild febrile illness, meningitis, encephalitis, and death in birds and mammals, including humans (1-3).
(5) demonstrated that mice, infected with WNV develop only an inapparent infection
. These mice will invariably die of fulminant is given.
Some persons may have clinically inapparent infection
or symptoms too mild to be definitively diagnosed, especially in disease-endemic areas (7,28).
A recent modeling analysis estimated that 84% of DENV transmission is attributable to persons with inapparent infections
because these persons are more mobile (12).
So, it was concluded from the present study that 60% of grossly normal MLN had significant microscopic lesions indicating that incidental abnormal findings of MLN are common, reflecting more widespread inapparent infections
in goats which were not evident clinically but seen only at the time of postmortem.
Isolation of mumps virus from human beings with induced apparent or inapparent infections
. J Exp Med 1948;88(2):223-32.
are common and a high percentage of avian populations are positive.
We found that an unusually high percentage of the population had secondary DENV infections in what was considered at the time a nonendemic area; therefore, we proposed that cryptic DENV circulation causing inapparent infections
might be affecting this area (9).