You may choose which COVID-19 vaccine you receive as a booster shot. “Some people may prefer the vaccine type that they originally received, and others may prefer to get a different booster. CDC’s recommendations now allow for this type of mix and match dosing for booster shots.

• When to get a booster: At least 6 months after completing your primary COVID-19 vaccination series.
• Which booster should you get? Any of the COVID-19 vaccines authorized in the United States…”
• See also The Guardian: ‘Zero-Covid is not going to happen’: experts predict a steep rise in US cases this winter. “A steep rise in Covid-19 cases in Europe should serve as a warning that the US could also see significant increases in coronavirus cases this winter, particularly in the nation’s colder regions, scientists say. However, there is more cause for optimism as America enters its second pandemic winter, even in the face of likely rises in cases.”
• See also MIT Technology Review – What Europe’s new covid surge means—and what it doesn’t – “New restrictions are coming into place across Europe as covid cases rise again. But there are several reasons why a new wave is happening.”