A single antigen vaccine targets one virus or one strain of a virus, while a multiple antigen targets multiple viruses or different strains of a virus. Single antigen -- Rabies vaccine. Multiple --- Most Flu shots, MMR, T-DaP etc.
What on earth? Even if that were true (it isn't), nothing about the data on the particular vaccine up for approval? So, no need for research. We can just guess based on vague notions.
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