Dr. Anthony Fauci is warning that fully vaccinated people are also susceptible to "long COVID" if they have a breakthrough infection.

"We already know that people who get breakthrough infections and don’t go on to get advanced disease requiring hospitalization, they too are susceptible to long COVID,” Fauci told McClatchy. "You’re not exempt from long COVID if you get a breakthrough infection."

As the delta variant surges, Fauci said, "there could be a variant that’s lingering out there that can push aside delta."

"If another one comes along that has an equally high capability of transmitting but also is much more severe, then we could really be in trouble," he said.

-ABC News’ Cheyenne Haslett

The New York International Automobile Show, set to begin Aug. 20 in New York City, has been canceled due to the spread of the delta variant.

"All signs were positive" when planning began "but today is a different story," show organizers said.

Louisiana now has 2,247 COVID-19 patients in hospitals -- a new all-time high for the state.

This surpasses the previous record set Tuesday of 2,112 patients, the state's Department of Health said.

Louisiana Gov. John Bel Edwards has reinstated a mask mandate for the month of August.

The governor said Wednesday that he won't mandate vaccinations for state employees until the FDA grants full approval.

He said 37.1% of the Louisiana population is fully vaccinated.

Pete Parada, the drummer for pop-punk band The Offspring, says he is not playing with the band at upcoming shows because he is unvaccinated.

Parada wrote on Instagram that he's avoiding the shot on his doctor’s advice, saying he’s had a lifelong battle with the rare neurological disorder Guillain-Barré syndrome and the vaccine's "risks far outweigh the benefits."

Because he's unvaccinated, "it has recently been decided that I am unsafe to be around, in the studio, and on tour," Parada said.

"I have no negative feelings towards my band," he continued. "They're doing what they believe is best for them, while I am doing the same."

-ABC News’ Evan McMurry

In Louisiana, which has the nation's highest case rate per 100,000 residents, COVID-19 hospitalizations are reaching peak levels, with more than 1,700 patients now receiving care.

"We're seeing people that are way too young to be so sick," David Wrightson, a respiratory therapist and ECMO (extracorporeal membrane oxygenation) specialist for the Willis-Knighton Health System in Shreveport, Louisiana, told ABC News. "We see families destroyed. We see children without one or more parent because of this virus. We see a new mom who will never go home to see her newborn, will never see her child grow up."

He went on, "When you see someone that's 30 years old with no medical problems at all, nobody knew anything was wrong, and we have this person literally on death's doorstep, doing everything in our power to turn them around and return them to their family. The vaccine is something worth getting."

More people need to see and understand the reality of this disease, he said.

"I wish I could show them a few steps in our day to see what we see and to see what we have to do, and to go home at night and, and have nightmares about those things, and sometimes cry yourself to sleep," he said.

-ABC News’ Erica Baumgart and Arielle Mitropoulos