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18 January, 07:04

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?

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  1. 18 January, 10:00
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    It was successful in eradicating chicken pox from the United States.

    It had no effect on the rate of chicken pox cases in the United States.

    It caused a 10% decrease in the number of chicken pox cases in the United States from 1995 to 2011.

    It initially caused a large drop in chicken pox cases in the United States
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