Health Officials Say Some Vaccines Are Being Kept Too Cold

US health officials reported issues with coronavirus vaccine storage temperatures, with some doses being kept too cold. Vaccines are supposed to be stored at minus 70 degrees Celsius, but some reached minus 80, leading to replacements. The impact of these temperatures on vaccine safety and efficacy is under investigation. Pfizer faces manufacturing challenges and has sought US government assistance.

What limitations is Pfizer reportedly facing?

What assistance has Pfizer requested from the US government?