Question 23

By wearing a face shield when coming into contact with body fluids, a phlebotomist is preventing exposure by the permucosal mode of transmission.

Wearing a face shield protects the phlebotomist from exposure to infectious agents that can enter the body through mucous membranes, which is characteristic of permucosal transmission.

A) Permucosal

This option is correct because permucosal transmission occurs when infectious agents penetrate mucous membranes, such as those in the eyes, nose, or mouth. A face shield provides a barrier that significantly reduces the risk of contaminants from body fluids coming into contact with these sensitive areas.

B) Vector

Vector transmission involves the transfer of pathogens via living organisms, typically insects, that carry and transmit diseases to humans. Wearing a face shield does not prevent vector-borne diseases, as these are not related to direct exposure to body fluids.

C) Fomite

Fomite transmission refers to the spread of pathogens through inanimate objects or surfaces. While a face shield can prevent direct contact with body fluids, it does not address the risk posed by contaminated surfaces, making this option incorrect.

D) Percutaneous

Percutaneous transmission involves the introduction of pathogens through the skin, often via needlesticks or cuts. A face shield does not prevent this mode of transmission, as it primarily protects the facial area rather than the skin.

Conclusion

The correct answer is permucosal transmission, as wearing a face shield effectively shields the phlebotomist from potential exposure via mucous membranes. The other options, including vector, fomite, and percutaneous, do not pertain to the protective function of a face shield in the context of body fluid exposure, thus confirming that they are incorrect.