Final answer:
EMTs should at a minimum wear gloves and an N95 respirator to protect against the spread of tuberculosis when treating an infected patient.
Step-by-step explanation:
When caring for a patient known to be infected with tuberculosis (TB), an EMT should take protective measures to prevent the spread of the disease. At a minimum, these measures should include wearing gloves and an N95 respirator, the latter providing a higher level of respiratory protection against airborne particles than a standard mask. While eyewear can also be useful in certain conditions, it is the gloves and N95 respirator that are crucial for preventing TB transmission.