Question

give scientific reason: nowadays, safer vaccines are being produced

Answer 1

because like a coin has two phase, like that, by increasing of technology , there is much rise of some harmful disease which is more Dangerous . so

Answer 2

It would be wrong to confirm that a vaccine is 100 percent harmless. Some vaccines can cause severe side effects but none of them results in life-threatening damages.

All vaccines are tested before they are sanctioned for use.

However, there are certain cases when a person might be allergic to the contents present in the vaccine, in those cases, it is difficult to look for an alternative.