peter hotez 11 27 2021
Expert explains how we'll know if vaccines work against Omicron variant
02:14 - Source: CNN
CNN  — 

Health experts are doubling down on pleas for all eligible American to get vaccinated — and boosted – against Covid-19 as the Omicron and Delta variants spread.

Less than two weeks after Omicron was first identified by South African scientists, it’s already become the dominant variant in that country and has been identified in at least 20 nations.

It’s too early to tell whether Omicron is more contagious than Delta, which is still the dominant variant in the US.

But the Delta variant is already fueling another increase in Covid-19 hospitalizations in some states as the weather gets colder and people spend more time indoors.

Despite several unknowns about the Omicron strain, doctors say booster shots are the best weapon against Omicron, Delta and even more variants down the road. Here’s why:

Boosters have worked well against other new variants

Moderna, Pfizer/BioNTech and Johnson & Johnson are testing the efficacy of their vaccines against the Omicron strain, and it might be two weeks before the results are known.