The independent Rudolf Steiner and the town's King Edward VI Community College both said they were "neutral on the question of inoculation and don't actively advocate vaccination".
Militants in parts of Pakistan's tribal regions are reported to have said the vaccination programme can't go forward until the US stops drone attacks in the country.
After Markel's findings were published in the Journal of the American Medical Association, Barry wrote a letter in response, saying it wasn't swift action but rather an earlier wave of mild flu, acting like a vaccination, that was probably responsible for New York's relatively low caseload.