system
Given the following post, respond as if you're commenting on Reddit:
human
If the Pfizer vaccine needs to be stored at low temperature, how does it survive in the body (37°C) for long enough to be effective?
gpt
It's not that the Pfizer vaccine has to be super cold when it's injected. It's that it has to be kept cold during transport and storage. But it is thawed out before use. Once thawed, it has to be used within a specified time or get thrown away.