Studies from the US show a very positive effect of Corona vaccination. The risk of Long Covid cases is reduced after vaccination, they say.
Amid the summer covid 19 waves in Austria and neighboring countries, studies published in the U.S. show the very positive effect of vaccination: a booster showed sound protective effects against infection in top U.S. basketball players and their teams. So far, according to the studies, the vaccines have prevented about 60 percent of impending pandemic deaths in the United States.
The three publications are in the Journal of the American Medical Association (JAMA), one of the most respected medical publications. Elena Azzolini of the IRCCS Humanitas Research Hospital in Milan and her Italian co-authors recently published a scientific study on the effect of Covid 19 vaccination on the incidence of long-term health problems (Long Covid) after illness (doi:10.1001/jama.2022.11691).
Thirty-one percent of observed patients with Long Covid signs
Between March 2020 and April 2022, workers in nine Italian healthcare facilities were observed. Regular PCR testing was performed. A total of 2,560 people participated in the study. 739 (29 percent) developed Covid 19 disease. Subsequently, 31 percent showed signs of long covid. The proportion was 48.1 percent in the first Covid-19 wave, eventually falling to 16.5 percent by the third wave at the end of the observation period.
Each Corona vaccine dose made a difference, according to a U.S. study
However, each vaccine dose made a difference: 48.1 percent of the unvaccinated with Covid-19 developed Long Covid, 30 percent with the disease after one partial vaccination, 17.4 percent after two vaccine doses, and 16 percent after three partial vaccinations and the disease occurred anyway.
Third partial vaccination reduces the risk of infection by 57 percent.
According to the authors, the effect was that the third partial vaccination against Covid-19 reduced the risk of SARS-CoV-2 by 57 percent. Symptomatic infections were as much as 61 percent less common. “This study showed that in young, healthy, and highly vaccinated groups of people with frequent checks for SARS-CoV-2, a ‘booster’ vaccination (third partial vaccination; note) resulted in significantly fewer infections.”
Massive data sets are used for the entire U.S.
Based on substantial data sets for the entire U.S. for the period Dec. 1, 2020, to Sept. 30, 2021, a scientific study to estimate the number of Covid-19 infections, hospital admissions due to the disease, and deaths due to severe disease progression was conducted by Molly Steele of the U.S. Centers for Disease Control (CDC/Atlanta), a government agency, and her co-authors. Sixteen million covid-19 illnesses and 310,000 deaths had already occurred before the opportunity to vaccinate against SARS-CoV-2 in the U.S. between January 19, 2020, and December 12 of the same year.
Vaccination started in the USA in December 2020, taken into account.
Modeling taking into account vaccinations started in the U.S. as of December 12, 2020, yielded the following results for the period from early December 2020 to the end of September 2021: “Covid-19 vaccination is estimated to have prevented 27 million infections with SARS-CoV-2, in addition to approximately 1.6 million hospital admissions and 235,000 deaths at the same time. Finally, the relative effectiveness of the Covid-19 vaccine was calculated to be 52 percent fewer infections, 56 percent fewer hospital admissions, and 58 percent fewer deaths in September 2021 than it would have been without the SARS-CoV-2 vaccines.
- sources: vienna.at/APA/picture: pixabay.com
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