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From an on line Senior's website which I'm a Member  https://www.yourlifechoices.com.au/health/covid19/glasses-cut-covid-infections-study? This although not conclusive I found interesting as

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Researchers hypothesize coronavirus immunity from dengue exposure



A new study suggests a mosquito-borne illness called dengue may afford some immunity against coronavirus.

Researchers at Duke University analyzed factors contributing to the spread of coronavirus cases in Brazil, and found an inverse correlation between the percentage of people with antibody levels for dengue fever and COVID-19 cases, growth rate and mortality.

“States in which a large fraction of the population had contracted dengue fever in 2019-2020 reported lower COVID-19 cases and deaths, and took longer to reach exponential community transmission, due to slower SARS-CoV-2 infection growth rates,” study authors wrote.

A similar inverse correlation was also said to be found among countries in Asia and Latin America and islands in the Pacific and Indian Oceans.

The findings were released in medRxiv on Monday and await peer review.

The study authors hypothesized that a safe and effective dengue vaccine could offer some immunity against SARS-CoV-2 before a coronavirus vaccine is available.

Miguel Nicolelis, the lead study author and professor at Duke University, told Reuters that the findings are interesting given previous research showing that those with dengue antibodies turn up false-positive COVID-19 tests, despite no coronavirus infection.

“This indicates that there is an immunological interaction between two viruses that nobody could have expected because the two viruses are from completely different families,” Nicolelis told Reuters, saying more research is needed to verify the finding.

According to data compiled by Johns Hopkins University, Brazil ranks third worldwide for the highest number of reported COVID-19 cases at nearly 4.6 million, preceded only by the U.S. with its nearly 6.9 million reported infections and India’s 5.6 million. Brazil tops India in coronavirus-related deaths, however, and ranks second globally at 137,272 reported deaths.

The researchers noticed a discrepancy of coronavirus cases in some areas of Brazil; states like Paraná, Santa Catarina, Rio Grande do Sul, Mato Grosso do Sul and others “tended to display a very slow growth of COVID-19 cases” after initial cases reported in March.

Researchers said the slow growth happened despite the states crossing major highways and a heavy influx of traffic from the “super-spreading” city of São Paulo.

Nicolelis also told Reuters that the team came across the findings by accident.

“It was a shock. It was a total accident,” Nicolelis told Reuters. “In science, that happens, you’re shooting at one thing and you hit a target that you never imagined you would hit.”


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Plastic face shields are all but useless when it comes to defeating the spread of the coronavirus, according to a new Japanese study.


Plastic face shields don't stop coronavirus spread, study claims

The study was conducted by Riken, a government-backed research center in Kobe, Japan

Plastic face shields are all but useless when it comes to defeating the spread of the coronavirus, according to a new Japanese study.

The clear coverings were tested in a simulation by Fugaku, the world’s fastest supercomputer, which found that nearly 100% of airborne droplets less than 5 micrometers in size escaped through the shields, the Guardian reported Tuesday.

One micrometer is the equivalent of one-millionth of a meter.

The shields, typically used by workers in the restaurant industry, were also ineffective at trapping larger droplets measuring 50 micrometers — about half of which were also able to escape.

The study was conducted by Riken, a government-backed researcher center in Kobe, Japan.

In order to reach its results, the Fugaku simulation combined airflow with thousands of particles of various sizes.

Makoto Tsubokura, a team leader at Riken, said regular face masks should be used instead of face shields.

“Judging from the results of the simulation, unfortunately the effectiveness of face guards in preventing droplets from spreading from an infected person’s mouth is limited compared with masks,” he told the Guardian.


Tsubokura said people who are not recommended to wear face masks could resort to donning shields — but only if they were outdoors or in indoor settings with proper ventilation.

Fugaku has conducted other simulations, recently finding that face masks made out of non-woven fabric are more effective at preventing the spread of COVID-19 than those made of cotton and polyester, the outlet noted.

Researchers at Duke University made similar findings last month, concluding that N95 masks are most effective but three-layer surgical masks and cotton masks are good stand-ins as well


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