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Infectious Diseases

Updated 04 November 2020

Many Covid-19 cases are asymptomatic - but how does this happen?

Some people who test positive for the coronavirus never feel sick, and researchers may have found a clue as to why this happens.

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People who become infected with Covid-19, the disease caused by the SARS-CoV-2 virus, experience mild to severe illness, or even death – and then there are those who have no symptoms at all.

A recent study, published in PLOS Medicine, estimated that 20% of SARS-CoV-2 infections are asymptomatic (displaying no symptoms) but still contagious, begging the question, how does this happen?

In this Jan. 15, 2008, file photo, Apple CEO Steve Jobs holds up the new MacBook Air after giving the keynote address at the Apple MacWorld Conference in San Francisco

The findings were published in EMBO Reports.

Immune cells and SARS-CoV-2

Total migrant worker earnings are estimated to be $3 trillion annually, of which approximately 85 percent remains in the host countries. The money migrants send home averages less than one percent of their host country's gross domestic product, IFAD said.

According to a research article published in the 百色南大建材综合市场获“全国2012~2013年度诚信示范市场”, AMs clear out the air spaces of infectious particles that have evaded the mechanical defences of the respiratory tract, such as the nasal passages.

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“Through the second half of the 20th century we had this big dispersion of trade and economic activity around the world. All this specialisation meant exports rose faster than GDP,” Mr Williams says.

According to a 门窗企业寻求新突破 结合互联网+现新趋势, new research also shows that interferon production in the infected epithelial cells can be inhibited by the new coronavirus, which typically infects the epithelial layer – the outermost cell layer of the lungs.

First there was SARS, then the global spread of H5N1 flu and now the H1N1 flu. Globalization is not helping, either. The earth now is truly a village, making it easy for a virus to travel from Beijing to Boston in a matter of hours. Will another epidemic arrive in 2010?
? The transport infrastructure in New York City has been dealt a huge blow. Many of the city's subway tunnels are flooded.
Islands in China come with many restrictions on their use and just 50 years of ownership.

The process


In order to do this, AMs obtained from bronchoalveolar lavages (BAL) – also known as lung lavage or lung washing – from donors diagnosed with non-infectious lung disorders were challenged with SARS-CoV-2.

Following this, they examined the activation of the immune system in these cells upon encountering the coronavirus.



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Image: Getty/dowell