Sometimes, several vaccines must be administered simultaneously during pregnancy; such is the case of Tdap (tetanus and diphtheria toxoids with acellular pertussis vaccine) and influenza vaccine, for instance.
In studies that enrolled non-pregnant individuals to assess the safety of concurrent administration of Tdap and influenza vaccines, compared to their separate use, there was no evidence of increased risk of adverse events.
Similarly, a large study conducted in the United States to compare the rate of acute events requiring medical attention (including, but not limited to fever) and the rate of adverse perinatal outcomes (preterm delivery, low birth weight, small for gestational age) between two groups of pregnant individuals (one who received Tdap and influenza vaccines at the same visit and one who received both vaccines separately) showed no increased risk of adverse events following the simultaneous administration of the two vaccines.
Therefore, the vaccines can be administered simultaneously.
