(A) Require larger dose / more boosters
(B) Require special storage (cold chain)
(C) Can conceivably mutate back to virulent stain
(D) Confer long-lasting protection
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(A) Require larger dose / more boosters
(B) Require special storage (cold chain)
(C) Can conceivably mutate back to virulent stain
(D) Confer long-lasting protection