What is NOT considered a route of entry for pathogens?

Washing hands is not considered a route of entry for pathogens because it is a preventive measure aimed at reducing the risk of infection. By thoroughly washing hands, individuals can effectively remove pathogens that may be present on their skin, thus preventing them from entering the body through potential routes such as mucous membranes, open wounds, or ingestion.

In contrast, mucous membranes, injectable substances, and ingestion are all recognized pathways through which pathogens can enter the body. Mucous membranes can be found in areas such as the respiratory tract and gastrointestinal tract, where they can absorb microorganisms. Injectable substances can directly introduce pathogens into the bloodstream or tissues, bypassing surface defenses. Lastly, ingestion refers to the consumption of contaminated food or water, which can deliver pathogens directly to the gastrointestinal system.