TCFA Feedyard Technician Certification Practice Test

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When using rehydrated vaccines, what is a good rule of thumb for mixing?

Mix as much as possible
Only mix what can be used in 1 hour
Mix enough for the whole day
Mix and store for later use

The correct answer is: Only mix what can be used in 1 hour

The principle of mixing only what can be used in a specific time frame, such as one hour, is crucial when working with rehydrated vaccines. Many rehydrated vaccines contain live organisms that can lose potency quickly once mixed. This time-sensitive nature means that they should be used shortly after preparation to ensure their effectiveness. Mixing too much vaccine at once can lead to waste if the entire amount isn’t used within the recommended time. If vaccines are mixed and stored for later use, they may become less effective or even ineffective due to the degradation of the live agents. Therefore, the best practice is to prepare only the amount that can be administered within that one-hour window, ensuring that the vaccines remain potent and effective for the intended immunization. This practice optimizes vaccine efficacy and helps avoid unnecessary loss.