• Denmark was the first country to initially suspend all usage of the vaccine in March over safety concerns, and has also put Johnson & Johnson's vaccine on pause pending further investigations into a possible similar blood clot link. • Almost one million of the country's 5.8 million population have received their first shots, 77% getting Pfizer-BioNTech's vaccine, 7.8% Moderna's and 15.3% AstraZeneca's.