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This is when people with COVID-19 are most at risk of spreading the virus



According to the latest data compiled by the Center for Systems Science and Engineering of Johns Hopkins University, the coronavirus pandemic hit another undesirable milestone on Tuesday when the number of COVID-19 infections reached 20,166. 415 people worldwide.

But the actual number of cases in both the United States and around the world could be much higher, health authorities said. The Centers for Disease Control and Prevention estimates that 40% of people with COVID-19 actually have no symptoms. Other data show that 16% of coronavirus transmission is caused by carriers who show no symptoms or show only very mild symptoms, who may not believe they have the disease.


Viruses can be detected in people one to three days before symptoms start, with viral load peaking around the day when symptoms start.

A case study of the quarantined Italian town of Vo published in the journal Nature in June found that more than 40% of COVID-1

9 infections were asymptomatic. With a population of about 3,200 people, Vò reported the first COVID-related death in Italy on 20 February. As a result, the town’s residents were quarantined for 14 days.

About 2.6% of towns tested positive for SARS-CoV-2, the virus that causes COVID-19, when lockdowns begin, but this has dropped to 1.2% after a few years. week. During this time, 40% of those infections are asymptomatic people. Researchers also concluded that people with positive test results without the virus take 9.3 days.

“A person with an asymptomatic infection is completely unconscious of carrying the virus and, according to their lifestyle and profession, can meet a large number of people without changing their behavior. , ”Research conducted by researchers at Imperial College London and University of Padua.

Enrico Lavezzo, a professor at the Department of Molecular Medicine at the University of Padua, said: “If we find some people are symptom-positive, we expect the number of asymptomatic carriers to be difficult to determine. and much more isolated.

A separate study from China on asymptomatic cases “shows that the proportion of people infected with never having symptoms is 23%,” the World Health Organization noted last month. “Many studies have shown that people infect others before they get sick themselves, which is supported by available viral transmission data. A Singapore transmission study reported that 6.4% of secondary cases were due to pre-symptom transmission, ”the organization added.

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Know when An infected person who can spread SARS-CoV-2 is just as important as how quickly the virus spreads. WHO recently released a scientific summary of how the virus spreads, especially in asymptomatic people.

Viruses can be detected in people one to three days before they start to show symptoms, with viral load peaking around the day when symptoms start, then decreasing over time. This level of spread appears to range from one to two weeks for asymptomatic people and up to three weeks or more for patients with mild to moderate illness.


Viruses can be detected in people one to three days before symptoms start, with viral load peaking around the day when symptoms start.

“SARS-CoV-2 transmission can occur through direct, indirect, or close contact with infected people through infected secretions such as saliva and respiratory secretions or sugar drops. their respiration, which is expelled when an infected person coughs, sneezes, talks or sings, ”says WHO. This makes asymptomatic transmission more common, the scientists say.

However, all studies on asymptomatic people have limitations, the WHO added: “For example, some studies do not clearly describe how they track people with no symptoms at the moment. test scores to determine if they have ever developed symptoms. Others have a very narrow definition of ‘asymptomatic’ as those who never have a fever or respiratory symptoms, rather than those who do not develop any symptoms at all. “

According to the Institute of Health Metrology and Evaluation (IHME) at the Medical University of Washington, the US may reach close to 300,000 by December 1, but wearing a consistent mask today could save about 70,000 lives. . IHME director Christopher Murray said: “It seems that people are wearing masks and are more out of society as the infection increases, then for a while when the infection subsides, people lose their guard and stop exercising. these measures to protect ourselves and others ”.

Dispatch from a pandemic:Ireland says people must wear masks in stores to prevent COVID-19 – but why is it taking so long?

COVID-19 has currently killed at least 738,266 people worldwide and the US ranks 15th in the world in death per 100,000 (49.5), said Johns Hopkins University. With 10,485 deaths, California recently became the third US state to record more than 10,000 deaths, behind New York (32,787 deaths) and New Jersey (15,890 deaths).

California Governor Gavin Newsom, a Democrat, last month announced a statewide resumption of operations at restaurants as well as bars, zoos, wineries, museums, and gambling halls. and movie theaters. “This happens in every county in California, not just those on the watchlist,” he said.

Shutdowns also affect the indoor operations of gyms, places of worship, offices for non-critical sectors, hair salons, beauty salons, in-house malls and other venues. Other business in 30 counties on California’s “watch list”, accounting for 80% of California state.

On the 1918 flu anniversary, health writer Ed Yong warned of another pandemic and now says that the United States must learn from the past seven months, adding, “COVID-19 only is a harbinger of worse epidemics about to come. ”


New York City, the epicenter of the epidemic in the United States in its early days, is a case study of how some Americans live better than others, and how viruses spread.

“Despite the warnings, the United States squandered every possible opportunity to control the coronavirus. And in spite of its significant advantages – enormous resources, biomedical prowess, scientific expertise – it remains awkward, ”he wrote in the September issue of The Atlantic. While Korea, Thailand Lan, Iceland, Slovakia and Australia acted “decisively” to level and then bend the curve of new infections downwards, “The United States only reached a plateau in the spring, after that. turns into a terrifying summer uphill slope, “he said.

Yong said he has spoken to more than 100 health professionals since the pandemic began and summed up US mistakes this way: “A slow response from a professionally denied government. has allowed coronavirus to gain foothold, ”combined with“ the chronic public health funding, ”he said. “A cumbersome, inefficient system of health care keeps hospitals unprepared for the next wave of illness. The racist policies that have existed since the colonial and slavery days make Native Americans and Blacks particularly vulnerable to COVID-19.

New York City, the once epicenter of the US pandemic, is a case study of how some Americans live better than others and how viruses spread. Black and Latino were hospitalized at twice the rate of whites during the peak of the crisis, city data released in May showed.

Black New Yorkers were hospitalized at 632 per 100,000, while whites were hospitalized at 284 per 100,000. Black and Hispanic residents died at 21.3 per 100,000, while non-white races died at 40.2 per 100,000, according to the data.

One theory: More overseas-born Americans tend to live in multigenerational households, and Asians and Hispanics are more likely to be immigrants than whites, according to the Center. Pew Research. People of color that are more likely to do frontline jobs have a higher risk of getting COVID-19.

Dispatch from a pandemic: A letter from Chennai as India tops 2 million COVID-19 cases: ‘Amid so many deaths, despair and depression, life goes on’

President Donald Trump on Saturday dismissed the nation’s lawmakers as he claimed authority to postpone payroll taxes and replace the expired unemployment benefit with a lower amount after negotiations with Congress on the newly collapsed coronavirus rescue package.

However, the executive decree and memoranda of understanding seem to provide relief amid a troubled pandemic that seems unfeasible or illegal, analysts say, the analysts added. that the wording of these commands raises more questions than answers.

The United States had the highest number of COVID-19 deaths of any country (164,329), followed by Brazil (101,752), Mexico (53,003), Great Britain (46,611) and India (45,257). The virus has infected at least 5,094,565 people in the US, the most of any country.

Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases and a member of the White House corona virus task force, is optimistic about a vaccine coming in late 2020 or early this year. 2021, and says that people must continue to practice social vision and wear masks.

Fauci said he hoped that the coronavirus vaccine could be developed as early as 2021, but had previously said that it was unlikely that the vaccine would provide 100% immunity; He said the best practice result, based on other vaccines, would be 70% to 75% effective. Other epidemiologists are even more cautious about a vaccine that will soon eliminate the transmission of the virus.

Michael Osterholm, an epidemiologist at the University of Minnesota who realized that the outbreak would become pandemic as early as January, told MarketWatch: “We won’t vaccinate our way. to get rid of this for more than eight billion people around the world right now. in the first day of this month. “And if we don’t have long-term immunity, we could potentially be looking at re-vaccination on a regular basis, if we can do that. We really had to understand really living with this virus, at least in my life, and at the same time, that doesn’t mean we can’t do much about it. “

Dow Jones Industrial Index DJIA,
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ended lower on Tuesday as investors awaited progress in the second round of a financial stimulus measure during the coronavirus pandemic.

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