COVID-19 updates: US has 1st day since November with fewer than 100K new cases

Pharmaceutical giant Johnson & Johnson has submitted its application for emergency use authorization of its COVID-19 vaccine to the U.S. Food and Drug Administration, the company announced Thursday evening.  

The single-shot vaccine is 66% effective at preventing symptomatic COVID-19, 85% effective at preventing severe illness and 100% protective from hospitalization and deaths, according to Johnson & Johnson. 

Johnson & Johnson said it expects to have product available to ship immediately following authorization and to supply 100 million doses to the United States in the first half of 2021. 

"Today’s submission for emergency use authorization of our investigational single-shot COVID-19 vaccine is a pivotal step toward reducing the burden of disease for people globally and putting an end to the pandemic," Dr. Paul Stoffels, vice chairman of the executive committee and chief scientific officer at Johnson & Johnson, said in a statement Thursday, adding that the company is "working with great urgency to make our investigational vaccine available to the public as quickly as possible."

The FDA said it will meet on Feb. 26 to review Johnson & Johnson's COVID-19 vaccine. An emergency-use authorization could be issued any time after the meeting concludes.

In addition to potentially offering a convenient, single-dose vaccine against the novel coronavirus, the Johnson & Johnson shot doesn't need to be frozen for shipping and long-term storage, like the COVID-19 vaccines developed by Pfizer and Moderna.

ABC News' Sony Salzman contributed to this report.

Beginning Feb. 15, anyone coming to the United Kingdom from a country on its travel ban list of COVID-19 hotspots must quarantine in a government-approved hotel for 10 nights, the U.K. government announced Thursday.

Most foreign nationals from high-risk nations already face U.K. travel restrictions due to the coronavirus pandemic. But this new rule will apply to U.K. citizens and residents arriving from one of the 33 "red list" countries: Angola, Argentina, Bolivia, Botswana, Brazil, Burundi, Cape Verde, Chile, Colombia, Democratic Republic of the Congo, Ecuador, Eswatini, French Guiana, Guyana, Lesotho, Malawi, Mauritius, Mozambique, Namibia, Panama, Paraguay, Peru, Portugal (including Madeira and the Azores), Rwanda, Seychelles, South Africa, Suriname, Tanzania, United Arab Emirates, Uruguay, Venezuela, Zambia and Zimbabwe.

Security will escort guests to their quarantine rooms when they arrive and must accompany them if they wish to access outside space for fresh air or a smoke. Three meals per day and laundry service will also be provided during their stay.

Those in quarantine will be required to take a COVID-19 test on both Day 2 and Day 8.

ABC News’ Zoe Magee contributed to this report.

Denmark, the Netherlands and Norway have joined the growing list of European countries that have said they won't recommend older age groups receive the COVID-19 vaccine developed by England's University of Oxford and British-Swedish pharmaceutical giant AstraZeneca until more data from clinical trials becomes available.

The Danish Health Authority said Thursday that it will recommend the Oxford/AstraZeneca vaccine to people under the age of 65 who are not at risk of serious illness from COVID-19. The drugs regulator citied a lack of documentation as to the vaccine's efficacy in older age groups.

The Norwegian Institute of Public Health said it will also limit use of the Oxford/AstraZeneca vaccine to those under 65 because there had been few participants older than that in the trial conducted by AstraZeneca.

Meanwhile, the Dutch Health Council said the efficacy of the Oxford/AstraZeneca vaccine in those over 55 "cannot yet be calculated because they participated only to a limited extent in the vaccine studies."

Belgium, France and Germany have made similar moves recently, while Switzerland went a step further and declined to authorize the Oxford/AstraZeneca vaccine for any age group, citing insufficient data.

The number of COVID-19 vaccine doses delivered across the United States over the past week dropped 22.5%, but the amount of doses administered increased 13.5%, according to a report from the U.S. Department of Health and Human Services.

The country has also seen a three-week downward trend in new COVID-19 cases, resulting in a 44% decline in the seven-day daily average since the peak on Jan. 8, the report said.

Still, the current number of daily cases remains over twice as high as the numbers during prior peaks.

ABC News’ Brian Hartman and Josh Margolin contributed to this report.