A new vaccine is developed that provides immunity to the virus causing abnormal cervical cells, and you reexamine data 2 years after the vaccine is implemented at your clinic. See the results in Table 4-4.Why might you consider lengthening the time between screens or developing a more specific screen with the new prevalence rate?

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TABLE 4-4 Test Positive Test Negative Totals Screening Test Results after Vaccine Implementation Abnormal Cells Present 180 20 200 Abnormal Cells Not Present 60 240 300 Totals 240 260 500