Question

Ami got an HIV test, and the results were negative. To make sure the results were accurate, she went back three weeks later for another test. She did not have sexual relations, and there were no life changing events between tests. This time, her test was positive. Which statement best explains why Ami’s tests showed different results? The tests were done too close together, and there must be more time between each test. Ami’s second test must have been contaminated by another source. HIV tests often show false positives so it is likely that Ami does not have HIV. Ami may have recently contracted HIV and had the first test done too early.

Answer 1

Ami may have recently contracted HIV and had the first test done too early.

There is  a window period between person's exposure to HIV and when a test can definitely tell positive HIV infection. The window period varies from person to person and is also different depending on type of HIV test.