How Eight Covid-19 Vaccines Work



Researchers are currently testing 64 coronavirus vaccines in clinical trials on humans. Below is a collection of explainers for eight of the leading vaccines.

Messenger RNA Vaccines







How Moderna’s Vaccine Works

The vaccine, known as mRNA-1273, has been approved in Canada and authorized for emergency use in the United States.

Adenovirus-Based Vaccines

Protein-Based Vaccines

Inactivated Coronavirus Vaccines


How the Sinovac Vaccine Works

The vaccine, known as CoronaVac, is approved in China and authorized for emergency use in Bahrain and the United Arab Emirates.

See the Coronavirus Vaccine Tracker for the status of other vaccines in development.

Tracking the Coronavirus


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