A nurse is evaluating the allergy profile of a client who has Graves' disease and is to undergo a thyroid scan. The nurse should identify which of the following allergies as a contraindication for the client to undergo a thyroid scan?

A. Varicella-zoster (chickenpox) requires airborne precautions due to its transmission via respiratory droplets or aerosols.

B. Vancomycin-resistant enterococcus (VRE) is typically transmitted through direct contact with contaminated surfaces or equipment and does not require droplet precautions.

C. Pertussis (whooping cough) is transmitted via respiratory droplets and requires droplet precautions to prevent transmission to others.

D. Rotavirus is primarily transmitted through the fecal-oral route and requires contact precautions, not droplet precautions.

A. Allowing the infant to suck on a pacifier during tube feedings can lead to aspiration or choking and is not recommended.

B. Placing enough formula for 12 hours in the feeding container may lead to formula spoilage and contamination, as formula should be prepared fresh for each feeding.

C. Changing the tube feeding setup every 36 hours is not typically necessary unless there are signs of contamination or malfunction. The frequency of changing the setup should be based on institutional policies and manufacturer recommendations.

D. Flushing the tube with water before and after feedings helps ensure proper hydration and prevents tube blockage. A volume of 30 mL is commonly recommended for infants.