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There were more and more reportsCovid-19 breakthrough infections Among the populations vaccinated as we become further and further away from the first shots. Just over 50% of the country isfully vaccinatedAccording to the latest data from disease control and prevention centers (CDC), but new strains of the virus - including the variant of highly infectious Delta, continue to spread and transform, disturbing infections will persist.

Although the breakthrough, Covid-19 cases has a lotLower hospitalization and mortality rate Among the non-vaccinated infections, the Delta variant led to more cases than expected. At the end of July, a CDC escape document revealed that there was around35,000 symptomatic covidation infections per week among fully vaccinated vaccinated (although the agency has not yet confirmed this data).

"Our vaccines work exceptionally well. They continue to work well for delta - with respect to a serious illness and death, they prevent it" "" Director of the CDCRochelle Walensky CNN saysAugust 5th. "But what theycan no longer do is to prevent transmission. "

Doctors and scientists are still studying the three vaccines in the U.s.-Moderna, Pfizer and Johnson & Johnson - to discover their effectiveness against the nine and more contagious delta variant and the mechanisms for disturbed infections. Now, a new study in Israel, which has not yet been examined by peers, revealed thatPeople gave the vaccine against Pfizer are more likely to test positive for COVID after a certain amount of time.

RELATED:CDC data leak causes concerns of revolutionary infections.

Leumit health researchers and the Institutional Review Card of the Shamir Medical Center in Israel have studied a group of 33,943 fully vaccinated adults who have received the vaccine against Pfizer. They broke the patients in three age groups: 60 or more, between 40 and 59 and between 18 and 39 years.

The study followed vaccinated patients during several months and tested them for revolutionary COVID-19 cases. Overall, about 1.8% of patients had revolutionary cases, indicating that it is still rare enough to get the virus after being vaccinated.

But the chances, regardless of their age, positive tests were higher in people who had their last dose vaccine more than five months ago. Among patients aged 60 and over, researchers found that the chances of testing positively that a revolutionary case was three times higher after five months.

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The results of the study line up on the CEO of PfizerAlbert Bourla Said on the vaccine earlier this year, although the internal figures of Pfizer differ. Bourla recognized in July that theDrops of efficiency of the company's vaccine about 84% after four to six months. A study funded by the company, which has not yet been evaluated by peers, revealed that the vaccine was stronger between one week and two months after receipt of the second dose. Thendeclined in efficiency An average of 6% every two months.

Appearing on CNBCThe exchangeAt the end of July, Bourla stated that the data suggest aStrong need for a booster dose. "The good news is that we are very, very confident that a third dose, a booster, will take the immune response at the levels that will suffice to protect against the variant of Delta," he said.

Last week, Food and Drug Administration (FDA) and CDCapproved a boost For those with weak or compromised immune systems, but a wider use of reminder fire has not yet been mandated.

RELATED:The FDA does not allow a booster for this vaccine.

In the meantime, the CDC recommends that people are vaccinated to remain vigilant about social distance and masking inside and outside, given the increased infection of the Delta variant.

"If you come home to someone who has not been vaccinated, someone who can not be vaccinated, someone who could be immunosuppressed or a bit fragile, someone who has comorbidities that Treat them at risk, I suggest you suggest wearing a mask in public interior environments, "Walensky said on CNN in early August.

RELATED: Moderna says that these 3 things will lead people more vaccinated to get Covid