PHILADELPHIA — Anthony Fauci caused a stir this week when he said on national television that the United States was “out of the pandemic phase.” Nationwide, epidemiologists cringed. For one thing, the word choice by the nation’s infectious-disease chief was wrong, as we’ll explain below. But the bigger question is whether Fauci was correct to suggest that in this country, the worst might finally be over. There’s now evidence suggesting that more than 90% of Americans have some level of COVID-19 immunity. Fauci later acknowledged that the world is still in the midst of a pandemic, but said the …