there is already studies confirming that vaccine antibodies lose effectiveness over time. In Spain, the duration of the immunity of vaccinated people, especially the elderly, will be investigated.
This question will be studied by the Carlos III Institute, although in Spain a study has already been carried out in which the Catalan Institute of Health participated, which offered a conclusion: those over 65 who did not pass the virus lose antibodies three months after the full regimen.
What decreases the effectiveness of vaccines over time
According to other British research, the effectiveness of pfizer vaccine drops from 88% to 74% in about six months after the second dose and AstraZeneca drops from 77 to 67 within 5 months.
In addition, Jannssen just announced that a booster dose of his vaccine would increase the level of antibodies up to 9 times. In short, the question is how long the immunity of each vaccine lasts.
“The protection offered by a vaccine decreases as time goes by and coronavirus vaccines were not going to be different,” explains José Antonio Navarro-Alonso, from the Spanish Association of Vaccination.
Experts indicate that the 3rd dose will not be necessary in the general population
In the case of Pfizer, one month after the second dose, its protection is at 88% and at six it is at 74. With AstraZeneca at 5 months it is at 67%. “The protection offered by the vaccine against serious illness, hospitalizations, intensive care or deaths is different, in that sense the effectiveness remains the same or almost the same“Navarro-Alonso clarifies.
A study in Catalonia indicates that in older people the antibodies fall to low levels three months after being vaccinated: “It is possible that the quality of their antibodies is slightly different”, Cristóbal Belda, director of the Carlos III Health Institute.
A third dose could already be necessary for the elderly and immunosuppressed: “In those cases, the administration of another dose can be vaccinated with some haste“Navarro-Alonso assures. All the experts rule out that the reinforcement is necessary for the general population.
–
