Studies reveal the effectiveness of vaccines against Corona


Two months after the start of the vaccination process against the new Corona virus in a number of countries and regions of the world, questions arise about the effectiveness of vaccines and whether they prevent infection with Covid-19 or transmit it if the person who received the vaccine is infected.

Evidence is increasing day by day that vaccines prevent infection with the virus to a large extent and prevent its transmission, with the emergence of a number of optimistic studies that were supported by a number of prominent researchers, according to an article in the “Fox” site.

Studies conducted in the United Kingdom and Israel showed that there is evidence that corona vaccines reduce infection with the emerging corona virus, by rates between 86 to 95 percent.

A study in the United Kingdom, published in the Lancet medical journal, found that two doses of the vaccine from Pfizer and Biontech reduced by 86 percent of someone’s chances of getting an infection that they could pass.

Another study in Israel showed that vaccination reduces the likelihood of infection by 89.4 percent, of having the disease without showing symptoms, and 93.7 percent of having Covid-19 when symptoms appear.

A study conducted by the “Clalit Health Services” organization in Israel, including 600,000 people who received two doses of the same vaccine, concluded that it is 94% effective.

And a new working paper published with the pre-publication program from The Lancet, Monday, clarified that health care workers in the United Kingdom who were vaccinated with the Pfizer and Piontech vaccine did not make them less likely to develop symptomatic infections, but rather made them less likely to be infected at all.

The study concluded that the effectiveness of the vaccine was 72 percent after 21 days of the first dose, and the effectiveness became 86 percent seven days after the second dose.

And although the studies focused only on the Pfizer and Biontech vaccines, there is reason to believe that the results translate into the Moderna vaccine as well, given that the two vaccines work very similarly.

Over time, more information becomes available about the ability of vaccines to restore our lives to what it was before the outbreak of the epidemic.

In an opinion article in the “Daily Beast” newspaper, epidemiologists at Johns Hopkins University, Kate Grabowski and Justin Lessler said: “We are confident that vaccination against the emerging corona virus reduces the chances of transmission of the virus.”

It is very difficult to study the extent of the effect of the vaccine on virus transmission and infection, because this requires exceptionally intense tracking of contact, which is what a few countries have.

But an epidemiologist and infectious disease expert, and advisor to the US President for virus affairs, Anthony Fauci, seemed optimistic in a briefing at the White House, last week, when he said that “The question that looms on the horizon is, if the person who was vaccinated is infected, does this person have the ability to Transfer it to someone else? Some studies indicate a very positive trend.

In contrast, an epidemiologist at Harvard School of Public Health, Mark Lipsitch, seems cautious in his optimism, because the evidence is still limited so far, but he indicated at the same time that the minimum reduction in transmission due to vaccines is 50 percent.

While British lawmakers have indicated the power of vaccines in announcing a gradual easing of lockdown restrictions, government scientists have warned that many people need injections to prevent an outbreak of the epidemic among vulnerable groups, who may suffer serious symptoms or death.

Britain decided to delay giving people second doses of the Pfizer and AstraZeneca vaccine for up to three months after the first doses, and chose to provide partial protection to more people from a single dose.

“We now need to understand how long this protection takes for a single dose of vaccine,” said Arne Akbar, a professor at University College London and president of the British Society of Immunology.

The British government has pledged to provide a first dose for every adult person by the end of July, as more than 17 million people have so far received at least an initial dose of the vaccine, a third of the UK’s adult population.

On Friday, the Israeli government said that the comprehensive closure imposed for more than a month throughout the country to contain the Kurna virus will gradually increase, starting from Sunday, after a slight decrease in the number of infections, after more than 3.3 million people received the first dose of the vaccine.

Israel, which has a population of nine million, has recorded more than 675,000 cases of the virus, of whom 5,019 have died since the outbreak began.

Netanyahu appealed to the population to go to receive the vaccine “as vaccinations prove their effectiveness,” and to link this to “opening the economy gradually, in a cautious and responsible manner.”

According to the US Centers for Disease Control, “CDC” received more than 61 million doses of the vaccine at least in the United States, and 18 million received the two doses, but the frost wave slowed the pace of vaccination.

With an average of 1.7 million injections given daily, Biden said he was confident he would be able to reach 600 million doses (enough to vaccinate the entire population) by the end of July.

At the same time, some scientists and public health officials still warn that people who have been vaccinated must continue to adhere to the health measures they followed before being vaccinated, by wearing masks and social distancing, until the effectiveness of vaccinations is confirmed, especially since there are many studies that are still It works on the effectiveness of different vaccines against the Corona virus and its various strains.


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