The European Union has so far approved 4 vaccines against COVID-19 that can be used for immunization including in our country, and below you can see official information for all of them, including a section on the technology used, and the effectiveness.
The vaccines from Pfizer BioNTech and Moderna still remain the most effective against COVID-19, while the sera from AstraZeneca Oxford and Johnson & Johnson are less effective, the differences between them being very large.
"The four vaccines against COVID19 authorized by the European Commission
How does the newly authorized vaccine developed by Johnson&Johnson work, what is its effectiveness, what information is there about protection, what adverse reactions have been observed in clinical trials, what are its contraindications, as well as other useful information you can find in the material published on the national information platform about to vaccination."
