You also might see different immune preparations, even. Immune cells in different locations make different types of antibodies and which type of antibody recog

You also might see different immune preparations, even. Immune cells in different locations make different types of antibodies and which type of antibody recognizes the antigen in the vaccine partly determines which type of resistant you build up. IgG and IgM are common in the blood, while IgE is found in places like the intestines.