Which group does not require routine HIV screening?

The appropriate reasoning for the correct response revolves around the specific guidelines regarding HIV screening. While routine HIV screening is recommended for a variety of populations due to the high risk of transmission or the significance of knowing one's HIV status, pregnant women are typically screened for HIV not just once per trimester but at the first prenatal visit, given that early detection is crucial for the health of both the mother and the baby.

However, it's important to understand that while screening can occur again during the third trimester in certain high-risk populations, it is not mandated for all pregnant women at every trimester. The other groups mentioned, such as all individuals aged 13-64, those undergoing treatment for tuberculosis, or individuals diagnosed with syphilis, gonorrhea, or chlamydia, are included in the routine HIV screening recommendations due to a higher likelihood of exposure or concurrent STIs, making regular screening a key public health measure. Therefore, the specific requirement regarding pregnant women differs, focusing more on the initial screening rather than a repeated routine approach each trimester for all.