The CDC offered new, more strict guidance on Wednesday.
A pandemic of the novel coronavirus has now killed more than 1.1 million people worldwide.
Over 41.1 million people across the globe have been diagnosed with COVID-19, the disease caused by the new respiratory virus, according to data compiled by the Center for Systems Science and Engineering at Johns Hopkins University. The criteria for diagnosis -- through clinical means or a lab test -- has varied from country to country. Still, the actual numbers are believed to be much higher due to testing shortages, many unreported cases and suspicions that some national governments are hiding or downplaying the scope of their outbreaks.
Since the first cases were detected in China in December, the virus has rapidly spread to every continent except Antarctica.
The United States is the worst-affected country, with more than 8.3 million diagnosed cases and at least 221,987 deaths.
California has the most cases of any U.S. state, with more than 886,000 people diagnosed, according to Johns Hopkins data. California is followed by Texas and Florida, with over 868,000 cases and over 760,000 cases, respectively.
Nearly 200 vaccine candidates for COVID-19 are being tracked by the World Health Organization, at least 10 of which are in crucial phase three studies. Of those 10 potential vaccines in late-stage trials, there are currently five that will be available in the United States if approved.
Spain has become the first nation in the European Union to hit the 1 million mark for coronavirus cases.
The country has reported a total of 1,005,295 cases and 34,366 fatalities, according to data from Johns Hopkins University.
New Jersey’s governor said Wednesday he will self-isolate after he was in close proximity to someone who just tested positive for coronavirus.
Murphy walked away from a news conference at Camden County Community College in Blackwood, New Jersey, on Wednesday shortly after learning he was close to someone Saturday who has since tested positive
Murphy tested negative Monday. His spokesperson later confirmed to The Associated Press that he also tested negative Wednesday.
ABC News’ Aaron Katersky contributed to this report.
German Health Minister Jens Spahn has tested positive for the coronavirus and is currently self-isolating, the DPA News Agency reported Wednesday, citing a Health Ministry announcement.
Spahn has developed cold symptoms so far, the ministry said.
The Robert Koch Institute reported that Germany recorded 7,595 new cases on Wednesday, bringing the total to 380,762. The death toll increased by 39, now totaling 9,875.
ABC News’ Christine Theodorou contributed to this report.
New York City Mayor Bill de Blasio unveiled a two-phased vaccination plan for the city during a news conference Wednesday.
In Phase 1, when the vaccine is in limited supply, de Blasio said health care personnel, front-line and essential workers, and vulnerable groups will be prioritized.
Phase 2 comprises of the general public, the mayor said.
"The vaccine will be a crucial part of our rebirth and open the economic bridge to our recovery," de Blasio said.
He added that he does not have an exact date of when the phases would happen, and it remains contingent on an approved vaccine, but promised “it will be sooner rather than later.”
New York City's rollout plan is in line with proposed federal prioritization plans, as the push for first dibs on a vaccine is already underway.
