H. influenzae (Hib) is a bacterium that causes severe invasive infections, especially in young children. Ninety percent of the children are young children under the age of five, and older children have fewer chances of being infected. Invasive infections can lead to a variety of serious diseases. The most common condition is meningitis, and bacteria often enter the bloodstream at the same time. Meningitis can cause fever, headache, stiff neck, and symptoms such as loss of appetite, nausea, vomiting, photophobia, confusion, and lethargy. Secondly, there are opportunities to contract pneumonia, sepsis, otitis media, acute epiglottis, and even death. Among them, patients with epiglottis may have symptoms such as fever, sore throat, drooling, swallowing pain, refusing to swallow, and even difficulty breathing.

Multiple advanced countries such as the United States, the United Kingdom, Germany, Australia, Canada, etc. have included Hib vaccine in the National Health Vaccine Program, and the Hong Kong Government has not included Hib vaccine in the immunization program for the time being. With full protection, parents can arrange for vaccinations for their children in private clinics or hospitals. At present, the 5-in-1/6-in-1 cell-free mixed vaccine has been added to the Hib vaccine, and parents can also arrange for independent injections by children.

Injection schedule ─ A total of four injections are required for injection at 2 months, 4 months, 6 months and 18 months of age.