the areas where this occurred are predom. hasidic
if you're not familiar with the areas (Williamsburg, Boro Park, Kirya's Joel, Monsey) are basically jewish ghettos.
not as harsh as you may imagine from war time photos, but densely packed lower income families who chose not to vaccinate based on 'belief'
they chose not to vaccinate, where other low income areas didn't have a choice they had the vaccines pushed at birth, no choice, essentially.
sauce
i live here.