The nurse uses the Standard Precautions, as outlined by the Centers for Disease Control and Prevention (CDC), when:

Choice A rationale

Suctioning a tracheotomy involves contact with respiratory secretions which can be infectious. Protective eyewear is necessary to prevent exposure to potentially infectious fluids.

Choice B rationale

Changing a baby’s diaper involves exposure to feces and urine, but does not usually require protective eyewear as splashing is not common.

Choice C rationale

Applying a dressing on the leg generally does not involve significant risk of splashes or sprays to the eyes, making protective eyewear unnecessary.

Choice D rationale

Gathering linens off a contaminated bed poses some risk of contamination, but typically does not involve splashes or sprays that would necessitate protective eyewear.

Choice A rationale

Roundworms are common helminth infections but not the most common. They are typically transmitted through contaminated soil and food.

Choice B rationale

Hookworms are another type of helminth infection that can be common but are primarily transmitted through direct contact with contaminated soil.

Choice C rationale

Tapeworms are less common and are usually acquired through the consumption of undercooked meat.

Choice D rationale

Pinworms are the most common helminth infection, especially in children. They are highly contagious and spread through the ingestion of microscopic eggs from contaminated surfaces or fingers.