CD40LG and infection: In addition, some commercial detection methods based on colloidal gold-labelled monoclonal antibodies such as IgM, IgG and IgA have been demonstrated to be rapid but less sensitive at the onset of dengue infection because IgM & IgG antibodies prominently develop following the decline of viraemia at 3–5 days and 7–10 days after onset of infection, respectively, during a primary infection12–14.