A key recommendation for controlling the spread of COVID-19 is to "test, test, test!". If we were able to test everyone using a test that was both 100% sensitive and specific for the disease, we would have no false-positive (wrong identification of people without the infection) and no false-negative (cases of infection that are missed) though no test is perfect. Based on data collected on 1,000,000 people so far, it is known that: For people who are infected with COVID-19 virus, 99% of them test positive. For people who have symptoms but are not infected with the COVID-19 virus, 3.5% of them test positive-which is known as false positive It is estimated that currently, around 0.1% of people have been infected with the virus. Imperfect Testing Positive results Negative results Total COVID-19 A B C NON-COVID-19 D 964,035 999,000 Total 35,955 964,045 1,000,000 Calculate the values for A, B, C and D 1. (1 mark) A = 2. (1 mark) B = 3. (1 mark) C = 4. (1 mark) D =