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Each time the virus spreads, it copies this sequence.
Most of the time, these tiny variations don't alter how the virus works.
The good news is that current COVID-19 vaccines are designed so that in most cases, they will work against new variants.
And researchers are working on ways to alter the composition of vaccines to cover possible new variations
What causes a virus to change?
Inside a virus, there are molecules called nucleotides which form different combinations.
We need to stop the spread
To stop stronger variants from emerging we need to work together globally.
That's why we need to work together for equal access to Vaccines around the world, and share information to stop the spread together.