Public health officials say the pace is picking up somewhat - nearly 9 million people have received their first dose according to CDC data - but experts say the pace needs to increase and that state and local jurisdictions need more resources and support to resolve the bottleneck.
Canada passed on an option to acquire an additional 16 million doses of the Moderna coronavirus vaccine because they wouldn't be delivered until after the government hopes to have the entire population vaccinated. The Javits Center is set to become a mass vaccination center in New York City.
Another 2.7 million doses of the BioNTech-Pfizer vaccine are expected by mid-February, according to the Health Ministry.
As of Monday night, more than 377,560 doses of COVID-19 vaccine had been administered in Canada, according to a third-party tally.
Tobias Kurth, director of the Insitute for Public Health (IPH) at Berlin's Charite Hospital told DW that the vaccination drive will take time to be fully rolled out.
India's Prime Minister Narendra Modi said the country expects to vaccinate 300 million people in the next few months.
On Tuesday, the RKI reported a record number of vaccinations, with over 60,800 people receiving a shot.
"To maintain the integrity of our supply chain, including the development, production, approval, supply and distribution of the vaccine, BioNTech has chose to offer a voluntary COVID-19 vaccination to its employees in Germany", it said.
Like the BioNTech-Pfizer, Moderna's vaccine is also a so-called mRNA vaccine, a new kind of vaccine that teaches cells how to trigger a immune response to the virus without injecting parts of that virus into the body.
"Following a thorough review of all the submitted data on safety, efficacy and quality, Swissmedic has today temporarily authorised the Moderna vaccine", it said in a statement.