Although some have already hit the market, there are still dozens of developing coronavirus vaccines around the world.
Some use proven technologies, others use new approaches. All vaccines have been tested differently, and some have been allowed to enter life even before being rigorously tested.
Its effectiveness varies, and the results of preliminary studies range from 50% to over 90%.
To date, regulators in various countries have allowed the use of half a dozen of them, most in accordance with the provisions on emergency use.
Some are about to do it. All available now require two doses, administered weeks apart.
Here are some of the most advanced vaccines:
–Pfizer: Developed with BioNTech; Licensed by the United States, the United Kingdom, the European Union, the World Health Organization and other countries.
–Modern: Developed with the US National Institutes of Health; Licensed by the United States, the United Kingdom, the European Union, the World Health Organization and other countries.
–AstraZeneca: Developed in conjunction with Oxford University; licensed from over 40 countries, including the United Kingdom, India, Argentina, Mexico and the European Union.
–Sputnik V: Developed by the Gamaleya Research Institute in Russia; authorized in Russia, Argentina and Bolivia, between a dozen countries.
–Sinopharm: Authorized in China and other countries, such as Hungary, Serbia and Morocco.
–Sinovac: Authorized in China, as well as in Turkey, Brazil and Indonesia.
–Bharat Biotech: Authorized in India.
–Johnson & Johnson: Developing; a dose; expects to seek authorization from the US Food and Drug Administration soon.
–Novavax: Developing.