He said it would become clear in the next months if the vaccine did not just stop people falling sick but also from passing the virus on.
In Spain, the vaccination began at Los Olmos nursing home in Guadalajara.
A health-care network with clinics in Boro Park, Bensonhurst and Williamsburg is under a criminal investigation for giving unauthorized COVID-19 vaccines, officials said Saturday.
It also brings a sigh of relief for European Union politicians who were frustrated after Britain, Canada and the United States began their vaccination programs earlier this month with the same German-developed shot.
Currently, there isn't enough vaccine for the groups that are supposed to get it first.
In Hungary, the first recipient of the vaccine was a doctor at Del-Pest Central Hospital on Saturday, the state news agency says.
The news site BoroPark24 reported December 21 that ParCare claimed it had received 3,500 doses of the Moderna vaccine.
The Czech Republic has ordered 15.9 million vaccines in total, more than half of which will be the Pfizer/BioNTech jab, which should cover almost 9 million people.
Mr Krueger said 40 of the home's 59 residents wanted the jab along with 10 of around 40 workers.
"We'll get our freedom back, we'll be able to embrace again", Italian Foreign Minister Luigi Di Maio said as he urged his countrymen to get the shot.
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However, until then, she stresses, people need to remain cautious.
In Germany, where a festive lockdown is also in place, some local authorities kick-started the vaccination campaign on Saturday, before the launch time agreed with the EU.
In France, where many question the safety of vaccines, the French government has been cautious in its messaging and keen to ensure that it is not seen as forcing vaccinations on the public.
Among those planning to gain exposure to the virus on Sunday were politicians who planned to receive viral footage, including Slovakian President Jusana Kaputova and Bulgarian Health Minister Kostatin Angelov.
"We have been waiting for this for a year now", Romanian prime minister Florin Catu said on Saturday after the first batch of the vaccine arrived at a military-run storage facility.
While the United States on Wednesday secured a deal with Pfizer Inc, for an additional 100 million doses for its Covid-19 vaccine, the cases of allergic reactions have reportedly found.
Meanwhile, a new virus variant that has been spreading rapidly around London and southern England has now been detected France, Spain, Canada and Japan.
The head of drugmaker AstraZeneca, which is developing a coronavirus vaccine widely expected to be approved by United Kingdom authorities this week, said Sunday that researchers believe the shot will be effective against a new variant of the virus driving a rapid surge in infections in Britain.
Around 9,750 doses have already arrived in Italy and another 470,000 are expected to arrive from next week, the health ministry said.