With a sniff or a swallow, new vaccines aim to put the brakes on Covid-19 spread

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As the SARS-CoV-2 virus spreads, it changes. That's helped it get past our firewalls, the immunity created by vaccines or left behind after we recover from an infection. Which is why, well into the third year of the pandemic, we're in the midst of another wave of Covid-19 caused by the most immune-evasive variant yet, BA.5. And more variants are coming. Even as vaccine manufacturers race to upd...

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