Extraordinarily high turnover among staffs at nursing homes likely contributed to the shocking number of deaths at the facilities during the pandemic, the authors of a new study suggested.

The study, which was published Monday in Health Affairs, a health policy journal, represents a comprehensive look at the turnover rates in 15,645 nursing homes across the country, accounting for nearly all of the facilities certified by the federal government. The researchers found the average annual rate was 128 percent, with some facilities experiencing turnover that exceeded 300 percent.

Gov. Greg Abbott of Texas announced on Tuesday that he was abandoning the state’s face mask requirement imposed amid the coronavirus pandemic and will allow businesses to operate at full capacity, saying “it is now time to open Texas 100 percent.”

The wide-reaching announcement in Texas came as similar rules were being lifted elsewhere: Restaurants, schools, movie theaters and bars are reopening and shedding restrictions in some of the nation’s biggest cities and most populous states, prompting more Americans to emerge after months of isolation and bringing the country closer to a semblance of life before the coronavirus pandemic.

In just a matter of weeks, two variants of the coronavirus have become so familiar that you can hear their inscrutable alphanumeric names regularly uttered on television news.

B.1.1.7, first identified in Britain, has demonstrated the power to spread far and fast. In South Africa, a mutant called B.1.351 can dodge human antibodies, blunting the effectiveness of some vaccines.