Category I vaccines are free vaccines that are administered by the state and are not charged at the time of vaccination.1 Vaccines that need to be administered at one’s own expense other than Category I vaccines are all Category II vaccines and there are more types of them.2 The more commonly used Category II vaccines include rabies vaccine, live attenuated varicella vaccine, live attenuated oral rotavirus vaccine, influenza vaccine, 23-valent pneumococcal polysaccharide vaccine, heptavalent pneumococcal conjugate vaccine, cell-free Haemophilus influenzae type b conjugate vaccine, inactivated polio vaccine, inactivated encephalitis B vaccine, etc. These vaccines are basically self-paying. Some vaccines may already be free locally, but many local vaccines require a fee.