<s>[INST] Hi Doctor, My recently born baby was given BCG vaccine twice by the hospital staff within a span of 3 days. It was completely evident that they did it with negligence. The doctor says that this was because the blood groups of mother and the baby are different. Is the explanation correct? Can there be any side effect? [/INST] No need to give vaccine twice.. The explanation was wrong,  side effects may be as lymphadenopathy.-swelling of lymph node in axillary,  nothing like serious </s>