The U.S. daily case average has climbed to more than 84,000, a 45.3% jump in the last week, according to federal data.

The daily case average is now more than seven times higher than it was six weeks ago.

All but three states are now reporting high (a seven-day new case rate ≥100) or substantial (a seven-day new case rate between 50-99.99) community transmission, according to federal data.

-ABC News’ Arielle Mitropoulos

The delta variant now accounts for 93% of all sequenced cases in the U.S., according to the latest CDC data, which was collected over the last two weeks of July.

Delta accounted for just 3% of cases sequenced in late May.

Across the Midwest, described as HHS regions 7 and 8, delta made up 97% to 98% of cases. This includes Iowa, Kansas, Missouri, Nebraska, Colorado, Montana, North Dakota, South Dakota, Utah and Wyoming.

-ABC News’ Cheyenne Haslett

The World Health Organization is calling for a moratorium on booster shots until more people from low-income countries have received a vaccine.

Low-income countries have only been able to administer 1.5 shots for every 100 people due to lack of supply, Dr. Tedros Adhanom Ghebreyesus, WHO Director-General, said Wednesday.

A moratorium on boosters until at least the end of September will "enable at least 10% of the population of every country to be vaccinated," he said.

But White House press secretary Jen Psaki said in response that the U.S. doesn't have to choose.

"We feel that it's a false choice and that we can do both," Psaki said Wednesday.

The U.S. has ordered enough supply for every American to get vaccinated, plus get a booster shot, according to the White House. The U.S. has already pledged to donate 580 million doses to the international community by 2022.

-ABC News’ Sarah Kolinovsky and Zoe Magee

The Centers for Disease Control and Prevention forecasts that daily hospitalizations "will likely increase over the next four weeks."

About 7,000 new COVID-19 patients are hospitalized each day right now. That may soar to 24,000 per day, according to the COVID-19 Forecast Hub at U Mass Amherst.

A real-world study of South African health care workers found that the single-shot Johnson & Johnson vaccine was highly effective against the delta and beta variants, according to the South African Medical Research Council, which presented the results Friday.

The vaccine was between 91% and 96% effective against death, according the study, which included more than 477,000 health care workers. J&J showed stronger protection against the delta variant, now dominant in the United States and South Africa, than it showed against the beta variant.

"The data reported today by South African investigators show that a single shot can protect against death due to COVID-19 in the most challenging epidemiologic setting: A massive delta surge in Africa," said Dr. Dan Barouch, director of the Center for Virology and Vaccine Research at Beth Israel Deaconess Medical Center, who helped invent the J&J shot but was not directly involved in the South Africa study.

While the results have not yet been published in a peer-reviewed journal, they may serve as a reassuring data point as the delta variant sweeps the U.S.

Glenda Gray, president and CEO of the South African Medical Research Council, who led the study, said at the Friday press conference that the J&J vaccine showed good durability, an indication that there's no need for booster shots just yet.

-ABC News' Sony Salzman.