(CNN) States across the United States should be prepared to distribute a coronavirus vaccine by November 1 "just in case" one is ready, the US Surgeon General said.
"We've always said that we are hopeful for a vaccine by the end of this year or beginning of next year," Dr. Jerome Adams said in an ABC News interview Friday. "That said, it's not just about having a vaccine that is safe and effective -- it's about being ready to distribute it."
The Centers for Disease Control and Prevention has asked public health officials in the states to prepare to distribute a coronavirus vaccine by late October or early November. As of Saturday, more than 6.2 million coronavirus cases have been reported in the US since the pandemic began and 188,252 people have died, according to a tally of cases by Johns Hopkins University.
Adams reiterated comments by public health officials saying that a coronavirus vaccine is possible but not probable by those dates.
When asked whether the November goal has more to do with science or reelection efforts, Adams said, "What people need to understand is we have what are called data safety monitoring boards that blind the data, so it won't be possible to actually move forward unless this independent board thinks that there is good evidence that these vaccines are efficacious."
Adams said the data from Phase 1 and Phase 2 trials have been positive.
"The most telling thing I can say to people is that when there is a Covid vaccine available, I and my family will be in line to get it," said Adams. "I think it will be safe, I think it will be effective and I think it will help us end this outbreak."
A school district in western New York has delayed the start of classes for students grades 5-12 after hundreds of employees have resigned or taken leaves of absence.
Ninety staff members of the Williamsville Central School District have taken a leave of absence due to Covid-19 and 111 others have resigned, Superintendent Scott G. Martzloff wrote in a letter to parents.
Martzloff said 1,375 middle school and high school students chose the fully remote learning model, creating more than 80 teacher vacancies. It's unclear when the district expects to begin offering classes for those students.
"We are working diligently to fill those positions to begin instruction in the fully remote online learning model for students in grades 5-12," the superintendent wrote.
CNN has reached out to the New York State Department of Education for comment.
Meanwhile in Boston, eleven first-year students at Northeastern University were suspended for gathering in a hotel room, considered "a violation of university and public health protocols."
The school announced the suspension Friday, saying the students have been asked to vacate the school grounds within 24 hours and they will not be receiving any refunds for the semester. They've been asked to get tested for Covid-19 on campus.
More than 800 students enrolled in a study-abroad experience have been staying in two-person rooms at the Westin Hotel in Boston, the school said.
Dr. Anthony Fauci, the director of the National Institute of Allergy and Infectious Diseases, told CNN Friday he would call out any political interference involving the approval of a Covid-19 vaccine in the US if he saw it.
Sources in the administration have told CNN President Trump is ramping up pressure on health officials to approve a Covid-19 vaccine before the November election.
"I'm not a regulator, I mean, I just do the science. I'd report the science in an accurate way, and certainly if I saw interference, I would be very disturbed and call it out," Fauci said. He added that he had faith the Food and Drug Administration would do what's right.
But the latest data suggests there are not enough minorities being enrolled in Moderna and Pfizer's Covid-19 Phase 3 vaccine trials.
Minority enrollment in the trials is important because the vaccine might work differently in people of color than in White people, and Covid-19 has hit Black and Latino communities particularly hard.
Fauci told CNN that Phase 3 clinical trials for coronavirus vaccines should aim to include minorities at levels that are at least double their representation in the population to better reflect the population most affected by Covid-19. That would mean 37% of the study participants would be Latino, and 27% would be Black.
This past week, 26% of the study subjects enrolled in Moderna's trial were either Black or Latino, while as of August 31, 19% of the study subjects enrolled in Pfizer's trial were either Black or Latino.
Moderna CEO Stephane Bancel told CNBC that the company's goal is for the clinical trial enrollment to line up with data from the US Census Bureau. According to that data, 18.5% of the US population is Latino, and 13.4% is Black.
A new model often cited by top health officials predicted Friday that an additional 224,000 people in the US could die from Covid-19 by January 1.
Near-universal mask use could cut the number of projected additional fatalities by more than half, according to the model from the University of Washington's Institute for Health Metrics and Evaluation. But it also warns the cumulative death toll could rise to 620,000 by the new year if all restrictions are eased.
The death rate could reach nearly 3,000 a day by December, an unprecedented number, due in part to "declining vigilance of the public," the IHME expects. For now, the model points to declining mask use in some regions from peak usage in early August.
The IHME model comes a day after a new CDC ensemble forecast predicted 211,000 US deaths from Covid-19 by September 26.
Fauci told CNN Friday there is only one way to prevent the death toll reaching the numbers predicted in this new model. "We've got to get our baseline back down to a much lower level."
Currently, the US is seeing about 40,000 cases a day, but if the baseline of cases is lowered, the country could get a better handle on stopping the spread, according to Fauci. And the use of masks would help the country prevent the "scary" number of predicted Covid-19 deaths, he added.
He encouraged people to make outdoor plans and keep gatherings small to prevent the spread of Covid-19 during the Labor Day weekend.