A study has established the importance of immunoglobulin A, an antibody that is part of the immune system, in generating a response to pneumonia vaccines. Researchers have found that the absence of ...

IgM and IgG antibodies against the dengue virus can be detected in most patients five days after the onset of symptoms. IgG can be measured for many months and even years after a dengue infection.

or an IgM-positive ELISA plus either an IgG titer that increased by a factor of 4 or more (to ≥1:128) on IFA or seroconversion from an IgG-negative ELISA to an IgG-positive ELISA between the ...