More than 900 million doses of coronavirus vaccines have been contributed in 165 countries worldwide.
Last week, CDC is investigating the blood clotting issue that is relating to two companies’s vaccines. AZ and J&J vaccines which are using DNA technology are now in safty concerns that they may cause blood clotting problem.
The vaccines are developed by Pfizer-BioNTech and Moderna which are using mRNA, are not affected by the blood clotting issue.