A school nurse is assessing a child and discovers Koplik spots on the child's buccal mucosa. Which of the following actions should the nurse take?

The correct answer is B, euphoria. Heroin is an opioid that produces a feeling of intense pleasure, or euphoria, as it binds to opioid receptors in the brain. Other physical effects of heroin use may include constricted (not dilated) pupils, slowed breathing (not tachypnea), and droopy eyelids (not nystagmus).

Heroin is an opioid drug that affects the central nervous system, leading to a range of physical and psychological effects. One of the most common effects of heroin use is euphoria, which is a feeling of intense happiness, pleasure, and wellbeing. This is caused by the drug binding to opioid receptors in the brain, triggering the release of dopamine, a neurotransmitter associated with pleasure and reward.

Other physical effects of heroin use can include dilated pupils (Choice A is wrong because), as the drug can affect the muscles in the iris, causing them to expand. Tachypnea (Choice C is wrong because), or rapid breathing, can also occur as a result of the drug's effects on the respiratory system. Nystagmus (Choice D is wrong because), or involuntary eye movements, can be a sign of opioid intoxication, but is not as common as euphoria or dilated pupils.

The correct answer is Choice A because, Double-bag soiled dressings in polyethylene bags. The nurse should double-bag soiled dressings in polyethylene bags to contain the infection and prevent the spread of methicillin-resistant Staphylococcus aureus (MRSA). The bags should be securely tied and labeled as contaminated.

Choice B is wrong because, Encourage the client to use a HEPA filter in the house, is not the correct answer because a HEPA filter is not effective in controlling the spread of MRSA.

Choice C is wrong because, Wear a mask when within 3 feet of the client, is not the correct answer because wearing a mask is not necessary unless the nurse is providing direct care to the client and is within 3 feet of them.

Choice D is wrong because, Remove fresh flowers from the client's home, is not the correct answer because fresh flowers are not a source of MRSA.