Vaccines offer a natural way to protect against possible infection from pathogens by exploiting the mechanisms of acquired immunity. In fact, vaccines train the immune system to deal with invaders in a timely manner before they cause a major problem..
But no vaccine can offer 100% protection for all people. Why is this happening;
The Professors of the Medical School of the National and Kapodistrian University of Athens, Gikas Majorkinis and Thanos Dimopoulos (Rector of EKPA) on the one hand, not all people can build an immune response with the same efficiency, Secondly, any immune response is finite in its validity. As an army can deal with a finite number of invaders at a time, in the same way the immune system can deal with a finite number of viruses at a time. In any case, the chance of a successful virus invasion may not be zero but it is dramatically reduced by vaccination.. How reduced are these chances with current SARS-CoV-2 vaccines?;
The chance of someone becoming infected after exposure to the virus 14 days after receiving and 2 Doses of vaccines available in Greece are up to 3 times less than if he had not been vaccinated. Then after a vaccinated person becomes infected the chance of getting seriously ill is reduced by 8 times than if he had not been vaccinated. In practice this translates to the vaccinated being at an extremely lower chance of ending up in hospital, in ICU or die due to virus infection.
Lately there have been examples of people being vaccinated but catching the virus. Does this mean that the vaccines have lost their effect on the new strains or that the vaccines do not offer protection?;
As explained above, vaccines reduce the chance of someone becoming infected but do not eliminate them.. So in a population that has been vaccinated 70% completely and given that the possibility of infection is reduced 3 times as a result of vaccination, we normally expect it 40% of diagnoses to concern vaccinated and the 60% concern unvaccinated.
So what was the contribution of the vaccine in this case;
First of all, in this example, if there had been no vaccination, the number of cases would have been at least 3 times higher (without taking into account that vaccinated people are much less likely to transmit the virus when they become infected and therefore the number of cases would be much higher if the vaccine had not been given). This is therefore a dramatic reduction in the number of cases in the first place. In addition, this 40% of infected people who are infected, however, are significantly less likely to develop a serious illness so very few of them will be taken to hospitals., intensive care units or and will end up.
In any case, however, it should be understood that the immune response from even the most powerful vaccine is finite. Therefore, the constant exposure to high viral loads, that is, very high risk contacts, can lead to infection even those fully vaccinated with a strong immune response. For this reason, those vaccinated in very high-risk activities should maintain personal protection and personal hygiene measures, especially when it comes to vulnerable groups..