Correct Answer: B

Rationale: The correct answer is B: Diarrhea. Rotavirus infection commonly presents with symptoms such as watery diarrhea, vomiting, fever, and abdominal pain. While abdominal pain and vomiting are also associated with rotavirus infection, diarrhea is a hallmark feature. Constipation is not typically seen in cases of rotavirus infection. Therefore, the most likely clinical manifestation that the nurse would observe in a child with suspected rotavirus infection is diarrhea.

Correct Answer: D

Rationale: The correct answer is Glargine (Lantus) as it has the longest duration of action among the insulins listed, lasting 12 to 24 hours. Lispro (Humalog) and Regular (short-acting) insulins have shorter durations of action, typically lasting 3 to 6 hours. NPH (Neutral Protamine Hagedorn) insulin has an intermediate duration of action, lasting around 12 to 18 hours. Therefore, choices A, B, and C are incorrect in the context of insulin duration.

Correct Answer: D

Rationale: The correct nursing intervention essential before surgery for an infant with Hirschsprung disease is maintaining NPO (nothing by mouth) status. This is important to prevent aspiration during and after the surgical procedure. Administering antibiotics (Choice A) may be necessary in some cases but is not the priority intervention before surgery. Ensuring bowel rest (Choice B) is not directly related to preparing for surgery and may not be the most critical intervention. Performing regular enemas (Choice C) is not recommended before surgery for Hirschsprung disease as it can aggravate the condition.

Correct Answer: C

Rationale: The correct answer is C: Maintain standard and contact precautions. RSV is highly contagious, primarily spread through respiratory secretions. Therefore, it is crucial to implement infection control measures such as standard and contact precautions to prevent the spread of the virus to other patients, staff, and visitors. Choice A is incorrect because warmth and dryness are not specific interventions for RSV; the focus should be on infection control. Choice B may increase the risk of exposing others to RSV, so limiting visitors is recommended. Choice D is unnecessary because RSV is a viral infection, and antibiotics are not effective against viruses.

Correct Answer: B

Rationale: The sweat chloride test is the gold standard diagnostic test for cystic fibrosis as it measures the concentration of chloride in sweat. In cystic fibrosis, there is an abnormal transport of chloride across epithelial membranes, leading to elevated sweat chloride levels. A chest X-ray may show characteristic changes in the lungs associated with cystic fibrosis, but it is not a definitive diagnostic test. Pulmonary function tests assess lung function but do not specifically diagnose cystic fibrosis. Sputum culture may identify respiratory infections but does not confirm the diagnosis of cystic fibrosis.