Speaking to German public radio (DLF), Spahn stressed that being first with a vaccine was not important, but stressed the importance of creating a properly tested, proven and safe vaccine that can be trusted for use on millions, or even billions of people, through doing studies and making the results public.
"That is why were talking with them to understand this vaccine", Vergeire said, adding that local regulatory approval is required for trials to take place. Her temperature came down to just slightly above normal the next day. It could live up to the high hopes expressed by President Putin.
The platform used for the vaccine was developed by Russian scientists over two decades and formed the basis for several vaccines in the past, including those against Ebola, Russian officials said.
Scientists say progress on vaccine development has been faster than for any other pathogen in history.
"It can be unsafe to start vaccinating millions. of people too early because it could pretty much kill the acceptance of vaccination if it goes wrong", Jens Spahn told local media.
The vaccine is given in two doses and will help people develop immunity to the virus for at least two years. And millions of volunteer Russians, teachers and medical workers first, will be vaccinated starting October.
Kirill Dmitriev, head of Russia's sovereign wealth fund, said Russian Federation had already received foreign requests for 1 billion doses.
Russian Federation has developed a vaccine and taken it through early clinical development but is now going to administer this to the general population before they have phase three clinical data on safety and efficacy.
It's not hard to see why Putin's government might be willing to gamble on an inadequately tested vaccine. Nobody knows if it's safe or if it works.
A vaccine would be the kind of significant achievement that would elevate Putin at home and in the worldwide community.
Russian Federation is the first country to register a coronavirus vaccine.
A Phase 1 study typically focuses on whether a vaccine is safe and whether it elicits an immune response in a small number of people.
Although Russia has a long history of vaccine creation, its coronavirus efforts have been shrouded in mystery. Adenoviruses cause the common cold, but in Covid-19 vaccines they're weakened and modified to deliver genetic material that codes for a protein from the novel coronavirus.
Why has Russian Federation named the vaccine Sputnik?
"I know that it works quite effectively, forms strong immunity, and I repeat, it has passed all the needed checks", Putin said, adding his own daughter had received the supposed vaccine. "I'm not scoffing at it, but it doesn't mean that the Russian economy is advanced".
If an unproven vaccine were given to large populations in Russia and globally, it could be like playing "Russian roulette". They may interpret getting a shot as a license to behave as if the virus has gone away, allowing the germ to spread more widely than it otherwise would.
"It's a critical moment, we are right at a point where things can get better or worse", Salvador Macip, an expert in health sciences at Catalonia's Open University, told AFP. The Masimo Foundation does not provide editorial input.