Question

question 17
1 pts
a vaccine using a live attenuated virus such as the vaccine against measles does not
cause disease in the recipient because
only a genetically engineered piece of the viral coat is used
the virus is weakened so that it does not replicate well in the body
the dna has been removed from the virus
it uses a different virus that looks like measles but doesnt cause disease

Explanation:

A live - attenuated vaccine uses a weakened form of the virus. The virus is weakened (attenuated) through various methods such as growing it in non - human cells or under specific conditions. This weakening makes the virus unable to replicate efficiently in the human body, thus it does not cause the full - blown disease.

• Option 1: A live - attenuated vaccine uses the whole virus (weakened), not just a piece of the viral coat.
• Option 3: DNA is not removed from the virus in a live - attenuated vaccine.
• Option 4: It is the same virus (measles virus in this case) that is weakened, not a different virus.

Answer:

the virus is weakened so that it does not replicate well in the body