It's to flatten the curve. Approx 10% of vaccinated still require oxygen and other medical measures. And with hospitals currently at full capacity, boosters are

It's to flatten the curve. Approx 10% of vaccinated still require oxygen and other medical measures. And with hospitals currently at full capacity, boosters are a short-term way to keep the hospitalization numbers low until kids can get vaccinated and every one else has had their chance before we fully open everything up once and for all.