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A health official at Hospital Las Higueras de Talcahuano, in the Biobío Region, who had received the first dose of the Covid 19 vaccine a few days ago Pfizer-BioNTech, tested positive for the coronavirus.
This was confirmed during this day by the health authority of that region, emphasizing that this was indeed feasible to happen. This, due to that the vaccine generates immunity days after the second dose, which was not yet received by the health worker.
“Complete immunity against Covid-19 is acquired seven days after the second dose is applied, which is applied 21 days after the first one, ”recalled the seremi Héctor Muñoz.
“TAll events after vaccination are reported to the Department of Pharmacovigilance of the Institute of Public Health, who keeps the record of these cases, as well as adverse reactions, “he added, according to the Cooperativa radio station.
The vaccine works very differently from other vaccines such as measles, chickenpox and flu, which generally contain small live parts, attenuated or inactive virus or bacteria you are trying to prevent. Thus, the immune system of a person recognizes the invaders and develops a lasting response, so if it meets that infectious agent again, it will already know how to defend itself properly.
But in this case, the Pfizer and BioNTech formula is based on a different principle and uses a molecule called mRNA – or messenger RNA – genetic material that our cells use to make various proteins. The scientists focused on the mRNA to develop the coronavirus spike proteins, which stick to the outside of each Sars-CoV-2 particle and allow the virus to enter human cells.
Thus, the researchers isolated the instructions from the Sars-CoV-2 mRNA to produce its spike proteins and surrounded that mRNA in a small bubble of fat (made of lipid nanoparticles) to protect it and prevent it from disintegrating within the body. Upon entering, they adhere to human cells and release their “instructions” to create coronavirus proteins.
This is when the human cell makes the same proteins that are normally found on the surface of the virus, mimicking what Sars-CoV-2 looks like on the outside. In this way, the immune system recognizes it as an invader and creates its antibodies.
