One step to ensure vaccine quality is to

• A. Keep vaccines in direct sunlight for warming.
• B. Purchase from a reputable source that will deliver a high quality vaccine.
• C. Use vaccines from any source you encounter.
• D. Store vaccines in a hot utility room.

Answer: (B)

Sourcing from a reputable supplier helps ensure vaccine quality because reputable providers maintain proper quality controls, verify expiration dates and lot numbers, and guarantee that the product is handled and shipped with appropriate cold-chain practices. This reduces the risk of degraded potency, counterfeit or unsafe vaccines, and ensures you receive a product that meets specifications.

Exposing vaccines to direct sunlight or heat, storing them in a hot room, or taking them from any source can damage potency and compromise safety, so those options fail to protect quality.