A booster shot should not be cause for concern. It’s a window into the future.

WAIT, A BOOSTER? The chief executive of Pfizer, Albert Bourla, says those who have received its two-shot coronavirus vaccine are “likely” to need “a third dose, somewhere between six and 12 months and then from there, there will be an annual revaccination,” depending on the science. This should not be a cause for dismay. Rather, it is a window into the future — the battle against coronavirus will go on for years, and require agility and different behavior.