Adverse reactions of diarrhea may occur after Pentavalent vaccination in infants, but bloody stools are not usually seen. In case of bloody stools, it is recommended to check for dysentery, enteritis and other diseases. After receiving DPT5 vaccination, infants and children may have some adverse reactions, such as pain at the injection site, fever, vomiting, diarrhea, and crying easily. Usually there are no cases that cause blood in the stool of infants and children after receiving DPT5 vaccination. When this happens, it is recommended to go to the hospital for examination to clarify whether it is due to enteritis, dysentery or other diseases. In addition, it should be noted that children who are allergic to any of the components of the Pentavalent Vaccine are strictly prohibited from receiving the vaccine, and attention should be paid to the care of infants and young children after vaccination to minimize the discomfort after vaccination.