PRACTICAL PROBLEMS OF VACCINATION CAMPAIGNS.
D004739:England; D006801:Humans; D008403:Mass Screening; D008499:Medical Records; D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines; D011635:Public Health Administration; D014611:Vaccination
D011055:Poliovirus Vaccine, Oral; D023321:Poliovirus Vaccines
ENGLAND; MASS SCREENING; MEDICAL RECORDS; POLIOVIRUS VACCINE, ORAL; PUBLIC HEALTH ADMINISTRATION