The article does not mention this, but it's quite probably the unvaccinated child in question is from the fast-expanding Hasidic community in Jerusalem, many of whom are strongly anti-vax. This has led to measles outbreaks in the past in NYC as well, and the community was also hit especially hard by COVID.
https://www.nytimes.com/2019/04/23/opinion/my-fellow-hasidic...