I think yes mandatory.

Yes,

This may become necessary in recent years.

We often develop lifelong immunity when we have had a disease. However, some diseases may lead to serious complications and sometimes death. When we vaccinate, we activate the immune system's "memory. A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and effective way. With the help of vaccination, it is possible to entirely eradicate some diseases worldwide. So far, this has been achieved for smallpox.

Thank you Sileesh Mullasseri Poonam Gusain for your reply.

COVID-19 vaccine may become an essential vaccine for international travel.

Yes, COVID-19 vaccine is an essential vaccine. Once the protective effects of the COVID-19 vaccination are proven beyond doubt in people of different ages and different immune status, in 3-6 months COVID-19 vaccine may a part of the international passport to travel freely.

Muhammad Yousuf ,thanks.

I think yes mandatory.