Figure 3From: Tetravalent recombinant dengue virus-like particles as potential vaccine candidates: immunological properties Indirect immunofluorescence detected that sera from tetravalent VLPs recognized DENV antigens. The C6/36 cells infected with DENV1-4 were fixed, incubated with a 1:40 dilution of antisera from the tetravalent VLP group and then stained for the virus (green). Evens blue dye staining was used to label cells (red). Magnification 400 × .Back to article page