Joe -“I posted a letter signed by Rav Malkiel, Rav Salomon, Rav Shmuel Kaminetzky, Rav Aharon Schechter”
Those Rabbonim (more like Rosh Yeshivos) are the ones people go to for Eitzas. They aren’t known as Gedolay Psak Halachah.
Here is the Psak – the Gedolim in our generaion came out with:
“Whoever isn’t vaccinated is a murderer” – so reads a Kol Koreh signed by leading Gedolim and Poskim in Eretz Yisroel.