Two top Lakewood haredi rabbis and Shmuel Kamenetsky have ruled that non-vaccinated children must be allowed to attend haredi schools, despite the danger these children pose to others. The ruling claims to be based on a ruling by Rabbi Chaim Kanievsky, the #2 non-hasidic Ashkenazi haredi rabbi in world, who is based in Bnei Brak, Israel.
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The rabbis who signed this letter – Matisyahu Salomon, Malkiel Kotler, and Philadelphia's Shmuel Kamenetsky (a longtime opponent of vaccines) are wrong halakhicly and wrong ethically. Children who are not vaccinated because their parents fear vaccines put hundreds of other children and adults at risk for catching illnesses that can kill or maim them. Choosing not to vaccinate does more than put your own child at risk – it puts everyone at risk, as you can see here.
You can read previous anti-vaccine stupidity from Shmuel Kamenetsky here.