A small series of mothers who self-identified within ultra-Orthodox Jewish communities in New York City and Rockland County continue to refuse vaccination for their children during a measles outbreak for a host of reasons, researchers found.

Reasons ranging from scepticism about vaccines to cultural factors influenced these mothers decisions not to vaccinate, to delay vaccinations or have a longer break between vaccines, argued Charles H. Hennekens, MD, DrPH, of Florida Atlantic University in Boca Raton, and colleagues, writing in a commentary in the American Journal of Medicine.