Which precaution should be taken when caring for a patient who may have a contagious disease?

When caring for a patient who may have a contagious disease, wearing a mask when working within 3 feet of the patient is a critical precaution to minimize the risk of transmission. This approach is part of standard infection control practices, particularly regarding respiratory pathogens, as diseases can spread through droplets when an infected person talks, coughs, or sneezes. By wearing a mask in close proximity to the patient, healthcare providers can effectively limit the potential inhalation of these infectious droplets, thus protecting both themselves and other patients in the healthcare setting.

The other options, while potentially relevant in certain circumstances, do not provide as comprehensive a strategy for infection control. Using gloves and masks at all times may be unnecessary and may not be practical in all situations, as it could lead to resource depletion. Keeping room doors closed at all times can restrict airflow and may not address the need for proper isolation protocols based on the specific disease. Avoiding personal protective equipment altogether poses a significant risk for the spread of infection and is counterproductive to patient and staff safety. Therefore, adhering to specific protective measures, such as wearing a mask when within close proximity to a potentially contagious patient, is the most effective and appropriate action to safeguard health in this scenario.