https://www.eastbaytimes.com/2022/07/22/with-a-sniff-or-a-swallow-new-vaccines-aim-to-put-the-brakes-on-covid-19-spread-2/

Injected vaccines against the coronavirus that causes COVID-19 have been hugely successful, saving nearly 20 million lives globally in their first year of use and slashing the pandemic’s death toll by an estimated 63%, according to a recent study. Yet good as these shots are, they have not stopped the virus from spreading from person to person.

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.