Vaccines were developed to provide immunity to a viral infection. Which of the following is a likely hypothesis of why the smallpox vaccine is no longer given?
A.) Smallpox only infects people who have not been vaccinated for chicken pox
B.)The smallpox vaccine was given for a long period of time and the disease no longer exists
C.)Smallpox only exists in some parts of the world so there is no need to vaccinate everyone
D..The smallpox virus has mutated and so the vaccine is no longer effective
Answers
Answered by
11
May be
D. The small pox virus has now mutated and so the vaccine is no. longer effective...
D. The small pox virus has now mutated and so the vaccine is no. longer effective...
Answered by
2
Smallpox once was a very common and moderately fatal disease. Thus the vaccine against smallpox was used at a large scale after generations.
By taking the smallpox vaccine in a vast population, the disease was made extinct in the late 1970's.
That's why today, the smallpox vaccine is no longer given.
Therefore the correct option is 'A'.
Similar questions