Trust in Hashem -“For those who do not vaccinate, there are Gedolim who say taking a vaccination is Assur al pi Halacha and does not constitute hishtadlus but rather borders the terrible belief of “Kochi Viotzem Yadi”.”
Name one! I heard of Rabbis saying that you don’t have to, but to say it’s Osser – you are sadly Mistaken.