Question

300 people attended a graduation party; 165 people claimed to have eaten the raw oysters and then developed symptoms associated with Norovirus. After interviewing all attendees, 212 people admitted to eating the oysters. What is the attack rate for the Norovirus in this outbreak? О 50% 55% 71% О 78%

Answer 1

ANSWER.

* Attack rate = Number of new cases/Total population * 100

         Here

           Number of new cases = 212.

           Total population = 300.

        Attack rate = 212/300 * 100

                            = 0.706* 100

                            = 70.6

                        = 71%