HIB vaccine is a vaccine against Haemophilus influenzae type B. It is recommended for children over 2 months of age who have not been infected with Haemophilus influenzae. HIB vaccine is meant to prevent meningitis and pneumonia in infants and children caused by Haemophilus influenzae type B, as both diseases are serious and can endanger the life of the baby. The method of vaccination is intramuscular injection. If infants are vaccinated from 2 months of age, they will be vaccinated 3 times between 2 and 6 months of age with an interval of 1-2 months each time and a booster at 15-18 months of age, for a total of 4 times; for infants who are vaccinated from 6 to 12 months of age, they will be vaccinated 2 times between 6 and 12 months of age with an interval of 1-2 months each time and a booster at 15-18 months of age, for a total of 3 times; children who are vaccinated at 1-6 years of age only Children who are vaccinated at the age of 1-6 years only need to be vaccinated once.