Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, says, "my hope, my expectation, is that we'll have not one but multiple vaccines in 2021."

"Unless you have a perfect vaccine, which very few are, you'll always have people who end up sick," Fauci told The New Yorker. "With or without a vaccine, we're going to need other treatments."

When it comes to Operation Warp Speed -- the White House's public-private partnership aiming to deliver 300 million doses of a safe vaccine -- Fauci said he "never liked the 'warp speed terminology.'"

"It suggests, incorrectly, that you're rushing things," he told The New Yorker. "Whenever people hear things are being rushed, they worry about safety."

Fauci said the "warp speed" part actually relates to the money the government put into vaccine production.

"If a vaccine doesn't work, you've lost a few hundred million dollars," Fauci said. "If it does work, if it's safe and effective, you've saved four, five, six months of waiting to get people the vaccine. That's huge."

Delaware, Maryland, Ohio and West Virginia were added on Tuesday to a quarantine list regulated by New York, New Jersey and Connecticut.

Thirty-five states and territories are currently on the travel advisory list, which applies to any area with a positive test rate higher than 10 per 100,000 residents or 10% or highest positivity rate over a one-week rolling average.

"It remains critically important for anyone arriving to New Jersey from these 35 states and territories to get tested for COVID-19 and self-quarantine for 14 days," New Jersey Gov. Phil Murphy said in a statement Tuesday.

States and territories that currently qualify for the list are: Alabama, Alaska, Arkansas, California, Delaware, Florida, Georgia, Guam, Hawaii, Iowa, Idaho, Indiana, Illinois, Kansas, Kentucky, Louisiana, Maryland, Minnesota, Missouri, Mississippi, Montana, North Carolina, North Dakota, Nebraska, Nevada, Ohio, Oklahoma, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, Wisconsin and West Virginia.

Pennsylvania restaurants can have 50% occupancy indoors beginning on Sept. 21, Gov. Tom Wolf announced Tuesday.

A new Sept. 21 rule also says restaurants must end alcohol sales at 10 p.m.

The University of New Hampshire has suspended a fraternity after a new cluster of coronavirus cases were linked to a recent party there.

More than 100 people who weren’t wearing face masks -- both students and non students -- attended the party at the university’s Theta Chi fraternity chapter in Durham, New Hampshire, on Aug. 29. Since then, at least 11 positive COVID-19 cases have been traced to the large gathering, which violated the school’s coronavirus-related policies and was in defiance of public health guidelines, according to University of New Hampshire president James W. Dean Jr.

"Let me be clear: this is reckless behavior and the kind of behavior that undermines our planning and will lead to us switching to a fully remote mode," Dean said in a statement Sunday. "The August 29 party is reprehensible and will not be tolerated. As soon as we heard of this party at Theta Chi, we started an investigation with the Interfraternity Council. We will be pursuing student conduct charges against the organizers and all students who attended the event."

All members of the fraternity chapter are in a 14-day quarantine, according to Dean.

"Theta Chi is under interim suspension immediately, as will any fraternity/sorority or other student organization that behaves in a similar manner, while we conduct the investigation," he said. "Until the investigation is complete, there is a moratorium on any in-person gatherings of any size within these groups."

Theta Chi Fraternity International Headquarters said its staff members are investigating the allegations since being notified that the Zeta chapter has been placed on interim suspension by the University of New Hampshire.

"Upon the completion of the investigation, the Fraternity will respond appropriately," the office said in a statement obtained by ABC News Tuesday. "Student health and safety are essential to Theta Chi’s mission. The Fraternity expects chapters to follow all applicable laws and regulations."