The nurse at the vaccination centre told me this...

If you are the unhealthy type with stress or a bad diet, don't take Pfizer.

The reason why gomen opt to give Pfizer to the elderly because the majority do exercise, eat right and live in a stress-free environment.

Last few weeks, a few frontliners died after vaccination. Could be due to work-related stress or a bad diet. Possible?

True or not, dunno because no way to verify.