COVID-19 was first detected in late 2019, but in the nearly three years since, the disease has been through several different mutations.
While infecting hundreds of millions of people worldwide, the disease has changed and evolved.
Along the way it became more dangerous in some instances, and milder in other cases.
But whenever one mutation became the dominant variant, it was because it was more infectious than others, and more effective at subverting antibodies.
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