Air pollution can worsen Covid infection: Study


London, Nov 18 | People infected with Covid, who had long-term exposure to air pollution, are more likely to end up in hospital or intensive care, finds a study.

The study found an association between higher exposure to Nitrogen Dioxide (NO2) and fine particulate matter (PM2.5) and increased disease symptoms, particularly for severe cases that ended in the hospital or in intensive care.

The association with PM2.5 was stronger for men over 60 years of age and people living in socioeconomically deprived areas, said the researchers from Barcelona Institute of Global Health (ISGlobal).

A series of previous studies have suggested that regions with higher pre-pandemic levels of air pollution had a higher incidence of Covid-19 cases and deaths. However, the reasons for these associations are not yet clear; air pollution could favour airborne transmission of the virus, or it could increase an individual’s susceptibility to infection or disease.

“The problem is that previous studies were based on reported cases, which had been diagnosed, but missed all the asymptomatic or undiagnosed cases,” said first author Manolis Kogevinas, researcher at ISGlobal.

To understand, the team measured a series of virus-specific antibodies in a cohort of adults living in Catalonia, with information on the long-term exposure of such individuals to air pollutants (NO2, PM2.5, black carbon and ozone).

The study, published in Environment Health Perspectives, included 9,605 participants among which there were 481 confirmed cases (5 per cent). In addition, blood samples from over 4,000 participants were taken to determine the presence and quantity of IgM, IgA and IgG antibodies to five viral antigens.

Of these, 18 per cent had virus-specific antibodies, but no association was found between infection and exposure to air pollutants. However, among those who were seropositive (that is, got infected), an association was found between higher exposure to NO2 and PM2.5 and higher levels of IgG specific for the five viral antigens — an indication of higher viral burden and/or symptom severity.

“Our study provides the strongest evidence globally on the association of ambient air pollution and Covid-19,” said Kogevinas. “These results are in line with the association between air pollution and hospitalisation described for other respiratory diseases such as influenza or pneumonia”.

Further, air pollution can also contribute by favouring the development of cardiovascular, respiratory or other chronic conditions, which in turn increase the risk of severe Covid-19.

The team said that the results provide additional support for the public health benefits of reducing air pollution levels, and highlight the influence of environmental factors on infectious diseases.

Source: IANS

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Share Market Closing Bell: Nifty ends around 15,800, Sensex tanks 1,416 pts

Share Market Closing Bell: Nifty ends around 15,800, Sensex tanks 1,416 pts

On the back of Global Clues and SGX, Nifty opened on a gap down note & continued downside momentum throughout the day and closed the session at 15809.40 level with a loss of 430.90. However, Bank nifty closed the session at 33315.65 level with a loss of 848.05 points.

India VIX closed at 24.56 up by 10.13% which is a sign of more volatility in upcoming sessions.47 stocks out of NIFTY 50 closed in RED which suggest broad based selling. All the sectoral indices were ended in the red with metal, IT indices down 4-5 percent.

Despite one way fall, Stocks like ITC, DRREDDY, POWERGRID were the top gainers, While WIPRO, HCLTECH, INFY, TCS & TECHM were prime losers. On a daily chart, Nifty has formed a Bearish candle which indicates downside momentum for an upcoming session. Moreover, Nifty is showing support from horizontal line i.e., 15750 levels which is make or break level. In addition, Nifty has been sustained above the 21-Monthly Moving Average which indicates a bounce back from lower levels can be seen.

However, the momentum indicators MACD & Stochastic were trading with a negative crossover & trading in oversold zone which is a sign of sideways to negative trend in Nifty. The Nifty may find Strong support around 15700 levels, breaching below it can show more downside till 15500 levels while on the upside 16000 may act as an immediate hurdle. On the other hand, Bank nifty has support at 32800 levels while resistance at 34500 levels.

Palak Kothari
Research Associate
Choice Broking

Source: Choice India


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