'Steady increase' in vaccines in past month, White House says

At least 75 confirmed cases of COVID-19 across 17 U.S. states have been linked to a Christian summer camp in North Carolina, officials said.

The outbreak is associated with campers and staff who attended The Wilds camp near Rosman in North Carolina's Transylvania County between June 28 and July 17, according to a statement from the local public health department.

The camp, nestled on 1,000 acres in the Blue Ridge Mountains, offers sessions for children, adults and families.

Last week, a spokesperson for the camp told Ashevile ABC affiliate WLOS that they had cancelled sessions that week to work on enhancing COVID-19 protocols. Although there was no plan to cancel further sessions, the spokesperson said the camp was working to limit the number of attendees and started asking campers to get tested for COVID-19 before their sessions.

"We've been checking our staff, we've been doing screenings for everyone who comes onto the campsite and anticipating they're coming to our campsite healthy," the spokesperson told WLOS during a telephone interview last week. "And the anticipation is that they would leave healthy as well."

The U.S. Food and Drug Administration has approved another extension to the shelf life of Johnson & Johnson's single-shot COVID-19 vaccine, from four-and-a-half months to six months, according to J&J.

"The decision is based on data from ongoing stability assessment studies, which have demonstrated the vaccine is stable at six months when refrigerated at temperatures of 36 – 46 degrees Fahrenheit," the company said in a statement late Wednesday.

On Tuesday, the Centers for Disease Control and Prevention quietly updated its guidance on testing for vaccinated people on its website.

While the CDC had previously said vaccinated people did not have to get tested for COVID-19 after being exposed to someone with the virus, unless they had symptoms, that is no longer the case.

The government agency now recommends: "If you’ve been around someone who has COVID-19, you should get tested 3-5 days after your exposure, even if you don’t have symptoms."

"You should also wear a mask indoors in public for 14 days following exposure or until your test result is negative. You should isolate for 10 days if your test result is positive," the updated guidance states.

Masks once again will be required while indoors at Disney World, regardless of vaccination status, the company announced Wednesday, as Florida has quickly become a COVID-19 hotspot.

Starting Friday, face coverings will be required for all guests ages 2 and up while indoors, including upon entering and throughout all attractions.

They are also required while riding Disney transportation.

Masks are still optional in outdoor common areas, the company said.

The theme park had initially dropped its mask requirement for vaccinated guests last month.

The updated rule will also go into effect Friday at Disneyland in California.

Disney is the parent company of ABC News.