Which statements explain why some vaccines can be taken by mouth but tuberculosis (TB) vaccine has to be injected?
1 Macrophages present antigens in vaccines to stimulate an immune response.
2 The TB antigens necessary to produce an immune response are proteins which would be digested in the stomach and small intestine.
3 There are no B-lymphocytes and T-lymphocytes in the stomach.
1 )
1, 2 and 3
2 )
1 and 2 only
3 )
1 and 3 only
2 only
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