China currently has five coronavirus vaccines undergoing large-scale, Phase III clinical trials.
"The speed of development for this and other vaccine candidates is testament to an extraordinary, collaborative, global research effort," said Charlie Weller from the Wellcome Trust.
The U.K.'s health secretary said the country will be ready to start vaccinating people from early next week.
Close scrutiny continues long after a product has been approved by regulators, even in a public health emergency.
"It was terrible to see," said swan rescuer Caroline Sim.
"We'll turn the corner on COVID in 2021 with the help of our technology," Scott Gottlieb said.
"We have a vaccine for the world," said Professor Andrew Pollard from the University of Oxford. So, how does it compare to other contenders? What are its other advantages? And who might get it first?
"It's wonderful news," WHO official Dr. David Nabarro said.
The drug was touted by President Donald Trump earlier in the pandemic.
"The safest way is to celebrate with people in your household," says the CDC. Otherwise, it's masks indoors, social distancing and disposable plates.
Rick Bright hailed the "remarkable effectiveness" of the vaccine as Pfizer said no serious side effects were reported in a large trial.
By December 2019, medical staff in Wuhan, China, were treating dozens of patients suffering from a mysterious pneumonia of unknown cause.
"The data are striking, they're really quite impressive," Fauci said.
The announcement comes after Pfizer and Russia institute said their vaccines are 90 percent and 92 percent effective respectively.
Vaccines "will protect us from the disease, but they will not make it disappear," the scientist said.
Pfizer said no serious safety concerns have been observed so far.
America recorded more than 1,000 new coronavirus deaths on Thursday as the number of active hospitalizations reached their highest point in nearly two months—around 41,000.
The latest outbreak is the second that has been linked to a church in the state.
A total of 370 North Dakotans have died as a result of COVID-19 since the beginning of the pandemic.
The 51-year-old patient had recently been fitted with a tracheostomy tube in her neck.
"By targeting specific age groups we can substantially reduce the number of doses required to achieve an equivalent reduction in transmission," researcher Michael Meehan said.
Images from the event show a large crowd of people, most of whom are not wearing masks.
Frequently cited estimates suggest this can only be achieved when 60 percent or more of the population is infected.
"That was a very difficult decision because I knew it would have very serious economic consequences," he said.
"I can't be locked up in a room upstairs and totally safe," Trump said.
"It is getting worse faster in Paris and the surrounding area," said French Health Minister Olivier Véran.
"Voters who aren't wearing masks could put public health at risk,' said Mississippi Representative Jeramey Anderson.
The White House medical team and I will maintain a vigilant watch," Sean Conley said in a statement.
The state currently has 3,661 active coronavirus cases, health department figures show, with a total of 100 deaths reported in September.