Connecticut Gov. Ned Lamont announced new COVID-19 vaccine requirements for state employees Thursday.

State employees in hospital facilities will be required to get vaccinated, while all other state employees, K-12 teachers and staff and early childhood staff will need to get tested weekly if they are not vaccinated, he said.

The requirements go into effect Sept. 27 and are on top of a previously announced vaccine mandate for long-term care employees.

"We've done very well, thank you Connecticut, in terms of people getting vaccinated," Lamont said at a press briefing. "We've got to do better."

More than 74% of Connecticut residents ages 12 and up are fully vaccinated, according to Centers for Disease Control and Prevention data.

Five states have fewer than 10% of their intensive care unit beds available, according to federal data.

Alabama has reached 100% ICU capacity, while Georgia is at 94% capacity, Florida at 93.18%, Mississippi at 93.01% and Texas at 92.72%, according to the latest data from the U.S. Department of Health and Human Services.

Nationwide, nearly 78% of staffed adult ICU beds are occupied, according to HHS, as the U.S. continues to experience its steepest increase in COVID-19-related hospitalizations since the winter of 2020. There are nearly 93,000 patients now hospitalized across the country with COVID-19, according to federal data.

Overnight, the U.S. recorded its fourth day with more than 140,000 new COVID-19 cases in the last seven days. The country's new case average has now surged to 130,000, up 13.2% in the last week, an ABC News analysis found.

-ABC News' Arielle Mitropoulos

More than 1 million COVID-19 vaccine doses were administered in the past 24 hours, including 562,000 first doses, a White House official confirmed to ABC News Thursday.

It's the first time 1 million doses in a single day have been logged in close to seven weeks, the official added, "a 31% week-over-week increase in the daily average of people completing their vaccine series."

-ABC News' Justin Gomez

The United States' early vaccine program likely helped prevent nearly 140,000 deaths during the first five months that shots were available, according to research published in the journal Health Affairs Wednesday.

Death reduction differed by state. New York saw the greatest reduction in COVID-19 deaths, while Hawaii saw the smallest benefit. "Overall, our analysis suggests that the early COVID-19 vaccination campaign was associated with reductions in COVID-19 deaths," the researchers wrote.

-ABC News' Eric Strauss

A new CDC analysis found that Pfizer and Moderna vaccine efficacy dropped "significantly" among nursing home residents from March to July, as the delta variant became the predominant strain in the United States.

Researchers analyzed weekly reports from thousands of nursing home facilities in the U.S. and found that mRNA vaccines were roughly 75% effective against preventing any infection in late winter/early spring of 2021, early in the mass vaccination rollout and prior to the emergence of the delta variant. By summer of this year, effectiveness against any infection had dropped to 53%.

Crucially, this doesn't mean vaccines aren't working for nursing home residents, but the significant drop in effectiveness from March to July may support the use of booster doses for them, according to the CDC report.

A second analysis found that the mRNA vaccines are holding up well against hospitalizations for COVID-19. The research, which was conducted across 21 U.S. hospitals, found that the Pfizer and Moderna vaccines remained between 84% and 86% effective against potential hospitalizations from March to July of this year. A third analysis, conducted in New York State, found that all three authorized vaccines remained more than 90% effective at preventing hospitalization from early May to late June.

-ABC News' Sony Salzman, Eric Strauss