If the applicant has not received any of the listed vaccinations and the vaccinations are age appropriate and medically appropriate, U.S. immigration agencies will say that the applicant has a “Class A condition” and is inadmissible. Some vaccines are expressly required by statute. Others are required because ​the Centers for Disease Control and Prevention (​CDC​)​ ha​ve​ determined they are in the interest of public health.​ This is the list in alphabetical order: Haemophilius​ influenza type B; Hepatitis A and B; Influenza; Meningococcal; Mumps, measles, rubella; Pertussis; Pneumococcal pneumonia​; Polio; Rotavirus; Tetanus and diphtheria toxoids​; Varicella.