Pfizer Vaccine: New Evidence for Immunity – Remains Strong for Several Months Against Hospitalization and Death

Two new scientific studies from Israel and Qatar show that immunity against him coronavirus after two doses vaccine of Pfizer/BioNTech begins to decline after about two months in terms of the possibility of coronavirus infection, but the vaccine remains for at least six months highly effective against the risk of hospitalization, serious illness and death.

However, new research published in the prestigious New England Journal of Medicine, according to CNN, seems to support the view that even fully vaccinated should continue to take precautions against coronavirus.

Pfizer Vaccine: Which People Have Significantly Lower Antibody Titles 6 Months After Vaccination

According to the APE-MPE, the Israeli study found that neutralizing antibody levels in 4,868 health workers at Sheba Medical Center showed a rapid decline in the first three months of the second dose (and at a slower rate thereafter), especially in men in the upper of 65 years and in immunosuppressed individuals. Six months after the second dose, the neutralizing antibody titers were significantly lower in men than in women, over 65 than at 18 to 45 years, and to those with an inadequate immune system.

It was also found that immunity lasts longer in vaccinated people than in those with natural immunity after Covid-19 infection. Immunity is even stronger in those who recovered and were later vaccinated, also.

When’s protection against infection drops to 20%

A second Qatari study found that protecting the vaccine against the possibility of any Covid-19 infection rises rapidly after the first dose and peaks at 77.5% in the first month after the second dose, while then gradually weakens. According to the researchers, the weakening seems to be accelerating in the fourth month and to drops to 20% after five to seven months.

Efficacy is greater against symptomatic infection than asymptomatic, but weakening of protection occurs in both cases. On the other hand, protection against the risk of serious illness, hospitalization and death increases rapidly and reaches 96% or more in the first two months after the second dose, remaining at this high level. for at least six months.

What may be the reason for the reduced protection of the vaccine against the possibility of infection

The researchers believe that the reduced protection of the vaccine against the possibility of infection with the virus is partly due to a change in the behavior of fully vaccinated people, who usually have more social contact than those who are not vaccinated and now have fewer precautions. “This behavior may reduce the effectiveness of the vaccine in real conditions, compared to its biological effectiveness, which probably explains the weakening of its protection,” according to the researchers.

Vaccine infections are known by international term “breakthrough” and, as other studies from Israel, the US and other countries have shown, these infections tend to increase over time, but this does not mean that the vaccinated person becomes ill, although the possibility of transmitting the virus to others cannot be ruled out. The researchers from Qatar estimated that “these findings show that a large percentage of the vaccinated population may lose their protection against infection in the coming months, which may increase the chances of new outbreaks.”

Pfizer has announced that immunity from the two doses of its vaccine begins to weaken after a few months and believes that this justifies the administration of a third booster dose. At present, the international trend is for this to happen – at least initially – to vulnerable groups and the elderly.

Here and here you will see the relevant scientific publications.