What can also create a portal of entry into the body?

Tubes placed in body cavities can create a portal of entry into the body because they physically breach the skin or mucosal barriers, providing a direct pathway for pathogens to enter. This is especially critical in clinical settings where patients may have catheters, endotracheal tubes, or other medical devices inserted. These devices can easily provide a route for microorganisms, leading to potential infections.

In contrast, ingesting food and breathing air generally do not serve as direct portals of entry in the same way when considering the aspect of pathogens entering through breaches in the body's defenses. While these activities can introduce pathogens, they primarily involve processes where the body has various defenses and barriers, such as the gastrointestinal tract and respiratory system, that help to prevent infections. Wearing protective gear is intended to prevent exposure to pathogens rather than creating a pathway for entry. Therefore, while protective gear is essential for safety, it does not create a portal of entry.