Figure 3From: Protective immunity against Trichinella spiralis infection induced by TsNd vaccine in mice Mouse IgG (A) and IgG subclass (B) responses to the immunization with pcDNA3.1-TsNd as measured by ELISA with rTsNd. The OD values shown for each group are the mean ± standard deviation (SD) of antibody levels (n = 10). The immunization time points are marked as solid arrows (↑), and the challenge time is marked as empty arrow ().Back to article page