You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which one of the following vaccines is contraindicated in pregnancy? and explain in detail?
MMR is a live vaccine prepared from live and generally attenuated organisms by passing repeatedly in the laboratory in tissue culture and thus it has lost their capacity to cause a full blown disease but retain their propeies of immunogenicity. Live vaccines are contraindicated in pregnancy considering the risk of teratogenic harm to the fetus. Rabies and Hepatitis B vaccines are killed or inactivated vaccines and no such contraindication exists to their use in pregnancy. Ref: Park's Textbook of Preventive and Social Medicine By K. Park, 19th Edition, Pages 97-8; Side Effects of Drugs Annual By Jeffrey K. Aronson, Pages 581-582; Immunology for The Health Sciences By Nicholas J. Vardaxis, Pages 101-4