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 C. After taking antibiotics for 24 hours.

Choice A rationale:

Returning to school if no complications develop is not a sufficient guideline for allowing a child with streptococcal pharyngitis to return to school. Streptococcal pharyngitis (strep throat) is highly contagious, and children should be treated with antibiotics to prevent the spread of the infection.

Choice B rationale:

Waiting until the sore throat is better is not a specific enough criterion for returning to school. While the resolution of symptoms is an important factor, it's crucial to ensure that the child has also been on antibiotics for an appropriate duration to reduce the risk of spreading the infection to others.

Choice C rationale:

The recommended guideline is to return to school after taking antibiotics for 24 hours. This timeframe helps ensure that the child's contagiousness is significantly reduced, minimizing the risk of transmitting the infection to classmates and school staff.

Choice D rationale:

Waiting for three days after taking antibiotics is not as precise as waiting for 24 hours. With proper antibiotic treatment, the child's contagiousness decreases rapidly, and waiting for three days might be unnecessary and could potentially result in more missed school days than needed.

The correct answers are choices B. Administer Benadryl, and D. Apply a cool compress.

Choice A rationale:

Placing an ace wrap on the bite is not recommended for a brown recluse spider bite. This action could potentially worsen the situation as it might trap venom in the area and increase the risk of necrosis.

Choice B rationale:

Administering Benadryl is a suitable action for alleviating pain and managing allergic reactions related to the bite. Benadryl (diphenhydramine) is an antihistamine that can help reduce itching and inflammation.

Choice C rationale:

Elevating the affected area might not provide significant pain relief for a brown recluse spider bite. Elevating is generally more effective for reducing swelling associated with injuries involving fluid accumulation, like sprains or strains.

Choice D rationale:

Applying a cool compress to the bite area can help alleviate pain and reduce inflammation. Cold therapy constricts blood vessels, which can reduce swelling and numb the area, providing relief.