Girls, my baby is 19 months old and the doctors want to give him a tet…

Girls, my baby is 19 months old and the doctors want to give him a tetanus shot. I'm against it, but the doctors keep saying it's dangerous. Apparently, we need to get some tests done before the vaccination. What kind of tests should I get? I actually want to write a refusal letter, but last month, the doctors were dying who didn't get vaccinated. It seems like they're deliberately scaring people that it's not safe. I don't know...