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Killed or inactivated vaccines, toxoids and polysaccharides can generally be given during pregnancy, as can oral polio vaccine Live vaccines are generally contraindicated because of largely theoretical risks to the baby. However risk and benefits need to be examined in some individual cases. Yellow fever vaccination may be considered after the 6th month of pregnancy, when the risk of exposure is deemed greater than the risk to the fetus. Pregnant women should be advised not to travel to areas where there is a risk of exposure to yellow fever. (WHO, 2005)