Pfizer was the first to announce that it had a working corona vaccine available. Pharmaceutical company Moderna followed a few days later. Both drugs are believed to protect more than 90 percent against the corona virus. The Oxford and AstraZeneca vaccine is also ‘almost ready’.
Both Moderna and Pfizer use the so-called mRNA method, in which a small piece of genetic material from the so-called spike protein of the SARS-CoV-2 virus is injected. The virus attaches itself to a human cell with that protein. The Oxford vaccine works by injecting a harmless cold virus with a small piece of coronavirus attached to it.
The big problem with the Pfizer vaccine is that it must be stored at -70 to -80 degrees Celsius. Moderna can be transported at a temperature of -20 degrees and the Oxford vaccine must be kept at normal deep-freeze temperatures during transport and can even be stored in the refrigerator afterwards. In any case, it makes the vaccine more suitable for poor countries.
Another big advantage of the vaccine produced by AstraZeneca is price. It would only cost 3 euros per dose, while that from Pfizer costs 30 euros and Moderna will probably charge 40 to 50 euros. You need two doses of all three vaccines.