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A British study shows that the booster dose loses its effectiveness against the Omicron variant after ten weeks.

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One British study suggests that the booster dose of the covid-19 vaccine loses its effectiveness in protecting against symptomatic infections caused by the Omicron variant after ten weeks.

There have not yet been serious enough cases of Omicron to evaluate the effectiveness of booster doses against severe symptomatic infection, but experts believe vaccines will continue to provide significant protection against hospitalization and death.

“It will take several weeks before the effectiveness of Omicron in treating serious diseases can be evaluated. However, based on previous experience, it is likely to be significantly higher than the estimates for symptomatic infections. ”, points to a new UK Health Safety Agency report cited The newspaper “New York Times

In the weeks following the discovery of the Omicron variant, several studies showed that the mutation, first identified in South Africa, avoids the antibodies produced after vaccination or covid-19 infection.

However, a new UK report, which includes data on people vaccinated by immunizers AstraZeneca, Pfizer and Moderna, indicates that the vaccines – both the original vaccination schedule and booster doses – were less effective and reduced their protection against Omicron Variant faster than Variant Delta.

Among people who received both doses of AstraZeneca vaccine, a booster dose with one of the mRNA vaccines, Pfizer or Moderna, was 60% effective in preventing symptomatic infection two to four weeks after injection. However, ten weeks after injection, the Pfizer booster dose was only 35% effective. The booster dose of Moderna has been shown to be 45% effective within nine weeks of vaccination.

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“These Nazis don’t speak Russian. It encourages barbarism”: an analysis of José Milhazes and Nuno Rogueiro

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In their usual analysis of the conflict between Russia and Ukraine in Jornal da Noite, SIC columnists José Milhazes and Nuno Rogueiro highlight the withdrawal of troops from Severodonetsk, Lavrov’s statement, and the statement of a Russian neo-Nazi group.

Nuno Rogueiro reports that the soldiers who have already begun to leave Severodonetsk are heading to Lisichansk, the only point in the Luhansk region, which is still controlled by the Ukrainians.

“The withdrawal began yesterday [quinta-feira]continues, apparently without casualties. They managed to get out without being surrounded or captured,” he says.

If in Lugansk the Ukrainians practically no longer offer resistance, then in Kherson they may find themselves in a “situation of superiority” over Russian forces, Nuno Rogueiro believes.

Ukrainian troops came close to Kherson, a port city in the south of the country. Although they have not yet entered, and contrary to what is happening in the Donbass, the ratio of Ukrainian and Russian forces is “1.5 to 1,” the SIC observer explains.

“Ukrainians have a situation of equality or even superiority here,” says Nuno Rogueiro.

José Milhazes highlights Lavrov’s speech, accusing the head of Russian diplomacy of “putting his feet on his hands.”

“Firstly, this suggests that Ukraine’s accession to the European Union does not carry anything fundamental. It goes on to say that the EU and NATO are preparing for war with Russia. Then they look for examples from World War II, compare the EU and NATO with Hitler“, He says.

This is another reference from Russia to the Nazis, but there is a group “which the Russians don’t talk about”Milhazes says.

“There is a Russian neo-Nazi group that has been fighting in the Donbas since 2015, and today a statement spread within the organization itself became known. They admit that during the fighting they commit “stupid things”, and if they do “stupid things”, they must eliminate witnesses who saw what they were doing. Civilians This is nothing but the encouragement of barbarism,” he concludes.

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Bank of Portugal sees risk of falling house prices | Bank of Portugal

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After four months of war in Ukraine and at a time when inflation reaches its highest level in decades, Banco de Portugal (BdP) is raising the tone of its financial stability risk warnings. Among the main risks now is the possibility of a “significant correction in market prices for residential real estate”, a scenario that, if confirmed, could have a direct impact on banks’ balance sheets.

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World’s largest bacteria found in Caribbean swamps

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Scientists have discovered the world’s largest bacterium in a Caribbean swamp, which, unlike most, is not microscopic and can be seen with the naked eye, according to Science magazine.

The thin white thread, about the size of a human eyelash, is “by far the largest bacteria known to date,” said Jean-Marie Folland, a marine biologist at Lawrence Berkeley National Laboratory and co-author of the paper citing the discovery. made.

Olivier Gros, a co-author and biologist at the University of the French West Indies and Guyana, discovered the first specimen of this bacterium, named Thiomargarita magnifica, or “magnificent sulfur pearl,” clinging to underwater leaves in the Guadeloupe archipelago in the Caribbean. Sea, 2009

The scientist did not immediately determine that this is a bacterium, due to its surprisingly large size, since these bacteria reach an average length of 0.9 centimeters.

Only more recent genetic analyzes have shown that the organism is a single bacterial cell.

“This is an incredible discovery. It raises the question of how many of these giant bacteria exist in the world and reminds us not to underestimate bacteria,” said Petra Levin, a microbiologist at the University of Washington who was not involved in the study. .

Olivier Gros also found bacteria attached to oyster shells, rocks and glass bottles in the marshes of Guadeloupe.

Scientists haven’t been able to grow it in the lab yet, but researchers say the cell has an unusual structure for bacteria.

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The principal difference is that it has a large central compartment, or vacuole (a cavity in cellular protoplasm), which allows some cellular functions to be carried out in this controlled environment rather than in the entire cell.

“The acquisition of this large central vacuole definitely helps the cell bypass the physical limitations (…) of cell size,” said Manuel Campos, a biologist at the French National Center for Scientific Research who was not involved in the study.

The researchers also noted that they are not sure why the bacterium is so large, but co-author Jean-Marie Folland suggested that it may be an adaptation to help it avoid being eaten by smaller organisms.

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