which of the following statements regarding immunizations and young children is true? group of answer choices in the united states, polio and pertussis largely still persist due to the limited access to vaccinations for these infections. the scientific community has widely supported the belief that infants receive far more vaccinations than their immune system can handle. vaccines only work if a high enough proportion of the population is inoculated. infants from all regions and economic backgrounds receive vaccinations as the health care system is the united states provides universal coverage.