The graph gives the number of varicella (chicken pox) cases between 1972 and 2011. Varicella is an Infectious disease caused by a virus. The
disease causes rash, itching, and fever in patients. The varicella vaccine was introduced in 1995. What can you conclude about the vaccine?
Vancella (Chickenpox) Cases
1972-2011
250 000 +
200 000+
The vancella vaccine was
introduced in 1995
150.000
Cases of Varicella
100 000 +
-
cases of vancella
50 000 +
1967)
13
[0366
0961
1998]
1991
L000
2001]
20021
2003
20041
20051
2007
2001
20097
20107
Year
A.
It was successful in eradicating chicken pox from the United States.
B.
It had no effect on the rate of chicken pox cases in the United States
C.
It caused a 10% decrease in the number of chicken pox cases in the United States from 1995 to 2011
D.
It initially caused a large drop in Chicken pox cases in the United States and the rate continues to decrease​