In planning documents sent last week to public health agencies around the country, the Centers for Disease Control and Prevention described preparations for two coronavirus vaccines they refer to simply as Vaccine A and Vaccine B. The technical details of the vaccines, including the time between doses and their storage temperatures, match well with the two vaccines furthest along in clinical tests in the United States, made by Moderna and Pfizer.
Here’s what you need to know about how the vaccines work, how they’re being tested and how they might be rolled out to the public — if, and it’s still a big if, they are proven to work.
How do these vaccines work?
Vaccines can take many different forms. The most common in use today contain inactivated viruses, weakened live viruses, or pieces of proteins. Moderna and Pfizer are testing a new kind of vaccine that has never before been approved for use by people. It contains genetic molecules called messenger RNA. The messenger RNA is injected into muscle cells, which treat it like instructions for building a protein — a protein found on the surface of the coronavirus. If all goes well, the proteins stimulate the immune system and result in long-lasting protection against the virus.
What do we know about how well these vaccines work?
Both vaccines have gone through extensive early tests, but we still don’t know for sure if they’re safe and effective.
Here’s what you need to know about how the vaccines work, how they’re being tested and how they might be rolled out to the public — if, and it’s still a big if, they are proven to work.
How do these vaccines work?
Vaccines can take many different forms. The most common in use today contain inactivated viruses, weakened live viruses, or pieces of proteins. Moderna and Pfizer are testing a new kind of vaccine that has never before been approved for use by people. It contains genetic molecules called messenger RNA. The messenger RNA is injected into muscle cells, which treat it like instructions for building a protein — a protein found on the surface of the coronavirus. If all goes well, the proteins stimulate the immune system and result in long-lasting protection against the virus.
What do we know about how well these vaccines work?
Both vaccines have gone through extensive early tests, but we still don’t know for sure if they’re safe and effective.
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