The recommended children's dosage of Keflex is 25 to 50 mg/kg/day in divided doses. The maximum daily safe dosage for a child weighing 42 lb is: Round to the nearest tenth.

(Number Only, do not enter mg, kg, or day with your answer)

The correct answer is Choice D: Refer children with sore throats for throat cultures.

Choice A rationale:

Recommending salicylates instead of acetaminophen for minor discomforts is not relevant to the prevention of rheumatic fever. Rheumatic fever is primarily associated with untreated streptococcal infections, particularly streptococcal pharyngitis (strep throat), which can lead to complications such as rheumatic fever if left untreated. The choice of pain relievers like salicylates or acetaminophen doesn't play a significant role in preventing rheumatic fever.

Choice B rationale:

Encouraging routine cholesterol screenings is not relevant to the prevention of rheumatic fever. Rheumatic fever is an immune-mediated inflammatory response to certain strains of Streptococcus bacteria, particularly Streptococcus pyogenes. Cholesterol screenings are more related to assessing cardiovascular risk and are not directly linked to preventing rheumatic fever.

Choice C rationale:

Conducting routine blood pressure screenings is not directly related to the prevention of rheumatic fever. Blood pressure screenings are important for identifying hypertension and other cardiovascular risk factors, but they do not have a direct impact on preventing rheumatic fever, which is primarily a complication of untreated streptococcal infections.

Choice D rationale:

Refer children with sore throats for throat cultures. This is the correct choice. Rheumatic fever often develops as a result of untreated streptococcal pharyngitis (strep throat). Throat cultures are crucial for diagnosing streptococcal infections and determining the appropriate course of treatment with antibiotics. By identifying and treating streptococcal infections promptly, the risk of developing rheumatic fever can be significantly reduced.

The correct answer is choice A: Avoiding use for more than 3 days.

Choice A rationale:

Recommending avoiding the use of decongestant nose drops for more than 3 days is crucial due to the risk of rebound congestion. Decongestant nose drops work by constricting blood vessels in the nasal passages to alleviate congestion. Prolonged use can lead to a phenomenon known as rebound congestion, where the nasal passages become more congested once the medication wears off, causing the person to use the drops more frequently. This can result in a cycle of worsening congestion and overuse of the medication, which can be counterproductive and harmful. Limiting the use of decongestant nose drops to 3 days helps prevent this rebound effect and encourages the use of alternative treatments if congestion persists.

Choice B rationale:

Administering drops until nasal congestion subsides is not the recommended approach. Prolonged use of decongestant nose drops can lead to rebound congestion, as mentioned earlier. Using the drops until congestion subsides might extend their use beyond the safe period and increase the risk of adverse effects.

Choice C rationale:

Keeping drops to use again for nasal congestion is not advised. While it's important to follow the medication's storage instructions, relying on decongestant nose drops for recurring nasal congestion can lead to overuse and rebound congestion. This choice does not address the potential risks associated with prolonged use.

Choice D rationale:

Administering drops after feedings and at bedtime is not a standard recommendation for decongestant nose drops. The timing of administration is not a primary concern in the context of decongestant use. Instead, the focus should be on the duration of use and the potential for rebound congestion.