Features of smallpox contributing to its eradication are
A
It has one antigenic type
B
Inapparent infection is rare
C
There was an effective
D
stable and safe vaccine
E
It multiplies in the cytoplasm of infected cells
F
The vaccine used contained live attenuated smallpox virus
Correct Answer: It has one antigenic type, Inapparent infection is rare, There was an effective, stable and safe vaccine
