Question

What is used to make the measles vaccine?
weakened measles viruses
dead measles viruses
products of measles viruses
live measles viruses

Answer 1

To make vaccines a person is inserted with a weakened virus that can be easily fought off in order to make the person immune. Therefore, the answer is weakened measle viruses.
Hope this helps!

Answer 2

Weakened measles virus is the answer.