About a year ago today (04 December 2020), scientists came to know about the Sars-CoV-2 corona virus, which spread Covid-19 disease, when some people in Wuhan, China, were reported to be infected.
But according to a new research, the virus caused the epidemic which had infected people many weeks before this.
The results of this research conducted by scientists from the Centers for Disease Control and Prevention (CDC) in the United States have been published in the journal Clinical Infectious Diseases.
According to the information available so far, officially the scientists got information about the corona virus on 31 December 2019 when health officials of Hubei province of Wuhan, China issued a warning saying that many such cases are being registered in which There are severe symptoms of pneumonia. He called it a strange kind of breathing-related illness.
But eleven months after the epidemic began, researchers now say there are 39 people in three states of the US who have antibodies to the corona virus in their bodies. These antibodies were present in his body for two weeks before he was warned about China's corona virus.
However, the first case of Sars-Cov-2 in the US was reported on 21 January 2020.
What do the research results say?
According to this research, a total of 7,389 people had lost their blood donation in the US from 13 December 2019 to 17 January 2020. Of these, antibodies to the corona virus have been found in blood samples of 106 people.
Antibodies found in a person's body mean that the person has been infected with the virus and their immune system has created antibodies to deal with that virus.
Of the blood samples taken between 13 and 16 December 2019 in California, Oregon and Washington, 39 have antibodies to the corona virus.
According to the research, 67 specimens were deposited in January 2020 in Massachusets, Michigan, Rhode Island and Wisconsin. This was before the outbreak of the epidemic in these states.
Most of the people who came in contact with this virus were male and their average age was 52 years.
Researchers believe that these people may have become antibodies against a corona virus already present in their bodies. However, he says that according to research, most of the people who have received antibodies, many of them had symptoms of Covid-19 at that time.
However, researchers say that large-scale virus infection began spreading in the US in the last week of February 2020. But till now the information about the origin of the virus will be changed by this research?
Where was the virus first found?
Where was the Sars-Cov-2 virus first found? It may never be possible to answer this question.
There have been many indications that the virus was already present in the world for several weeks before it was found in Wuhan, China on 31 December 2019.
But CDC researchers say that they cannot say for sure that these people were infected in their own country or that they were infected by the virus during the journey.
The Red Cross, the organization that organizes the blood donation program, says that only three percent of the people whose samples were collected said that they had recently traveled abroad. Of this, five percent said that they have returned from a tour of the Asian country.
In some other research done before this, evidence of corona virus was found in people of other countries before China warned.
In May 2020, French scientists said that on 27 December 2019, a person was treated as a suspected pneumonia patient near Paris. These individuals were actually infected with the corona virus.
Researchers in several countries had reported that corona virus was found in sewer water samples. These samples were taken several weeks before the epidemic was declared.
In June 2020, Italian scientists had said that on 18 December 2019 traces of the corono virus were found in the sewer waters of the city of Milan. However the first case of corona virus was confirmed much later.
According to a research conducted in Spain, in mid-January 2020, sewer water samples were taken in Barcelona, traces of corono virus were found. But the first case of corona was confirmed here forty days later.
How did this virus reach Brazil? Many questions have also been raised about this.
The first case of corona infection was found in Brazil on 26 February 2020. The first patients from Corona, a 61-year-old businessman from São Paulo, returned from a trip to Italy a few days earlier. By that time Italy had become the second center of the epidemic.
However, a team of researchers from Brazil's Federal University of Santa Catarina (UFSC), a few months earlier, had reported that the virus was found in sewer water on 27 November 2019.
According to another research conducted by the Oswaldo Cruz Foundation, the first case of Sars-Cov-2 infection was found here in Brazil between 19 and 25 January 2020, about a month before the first coronary infection was officially confirmed in Brazil. However, it is not yet known whether this person had toured overseas or not.
So didn't the virus spread from Wuhan Animal Market?
One thing that is not yet known about Sars-CoV-2 is not when did it come from animals to humans, but rather when did the virus start infecting people?
Experts say that so far the epicenter of the epidemic is believed to be the Wuhan animal market where live and dead wild animals are traded. This is because a large number of cases of infection were reported in the early stages related to this market. But researchers are unsure that the virus started spreading from person to person from there.
Microbiologist Yuen Kwok-yung at Hong Kong University told the BBC, "If you ask me, I think it is likely that the virus started spreading from the markets where wild animals are bought and sold."
China has also lagged behind its timeline regarding the Corona virus. It is not a big deal to do this during an investigation involving the onset of a fast-spreading virus.
According to a study done by doctors in Wuhan, China, the first case of corona was identified here on 01 December 2019 and it was not related to the animal market. The study was published in the medical journal Lancet.
Some experts say that the virus, which has the potential to spread the epidemic, is present worldwide for months without detection, it is not possible.
But it is possible that the virus has been recognized and already existed in the northern hemisphere, especially during winter.
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