system
Given the following post, respond as if you're commenting on Reddit:
human
How do you mass produce vaccines in the huge quantities needed to fight Covid-19?
gpt
Pfizer already has a large number of “clean room” manufacturing facilities around the world. Moderna is using contract manufacturing facilities. Unlike traditional attenuated vaccine manufacturing like the annual flu vaccines, these vaccines use new mRNA lipid nanoparticles for vaccine delivery to the cell. This is a quicker process. There are different manufacturing limitations for both vaccines that will constrain production volume, hence the current issues about who gets the vaccines first.