The scientist who won the race to deliver the first widely used coronavirus vaccine says people can rest assured the shots are safe, and the technology behind it will soon be used to fight another global scourge — cancer.

Ozlem Tureci, who co-founded the German company BioNTech with her husband, was working on a way to harness the body’s immune system to tackle tumors when they learned last year of an unknown virus infecting people in China.

Drug makers including BioNTech and Moderna are scrambling to test their COVID-19 vaccines against the new fast-spreading variant of the virus that is raging in Britain, the latest challenge in the breakneck race to curb the pandemic.

Ugur Sahin, chief executive of Germany’s BioNTech, which with partner Pfizer took less than a year to get a vaccine approved, said on Tuesday he needs another two weeks to know if his shot can stop the mutant variant of the virus.

The first COVID-19 vaccine that’s likely to go into any American arms is Pfizer’s mRNA vaccine, which was designed and developed by the German biotech company BioNTech. Here, we give a rundown of basic facts about the vaccine and an overview of how it works.

Vaccine name: BNT162b2; Design type: mRNA; Dose number: 2, 21 days apart

Efficacy: 95% efficacy in preventing symptomatic COVID-19 in adults without prior evidence of infection a week or more after receipt of the second dose.

Just last week, Pfizer and BioNTech revealed that their experimental Covid-19 vaccine, called BNT162b2, was at least 90 percent effective in an early analysis. On Wednesday, the pharmaceutical and biotech companies reported that their vaccine was even more effective after it cleared more clinical trial benchmarks for safety and efficacy. And on Friday, they said they are requesting an emergency use authorization (EUA) from the Food and Drug Administration.