Whose guidance do I follow if they seem to contradict each other?

The Medical Clinic determines if an individual should be tested, isolate, and/or quarantine and what behavior those situations require from individuals and their households. Schools, workplaces, and organizations can establish their own policies concerning personnel who have been instructed by the clinic to test, isolate, and/or quarantine.

Source: USAG Stuttgart TownHall Q&A, October 29, 2020.