Why the Delta variant is spreading COVID-19 so quickly

Due to the rapidly spreading delta variant, the U.S. Centers for Disease Control and Prevention now recommends that fully vaccinated people begin wearing masks indoors again in places with high COVID-19 transmission rates.

(Lauren Pelley/ CBC News) — It’s the word on everyone’s mind right now when it comes to the COVID-19 pandemic: Delta.

The highly contagious variant, which was first discovered in India in late 2020, has spread around the world and now accounts for the majority of cases in Canada and various other countries. The recent spread in the United States has led the U.S. Centers for Disease Control and Prevention (CDC) to recommend that Americans wear masks in areas with substantial transmission “regardless of vaccination status.”

So, why is this particular variant spreading so rapidly? And what’s the mechanism at play behind its apparent success at infecting human hosts? (…)

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