CA COVID-19 was first defined in China as an accountant in Wuhan pouring into 8/12/2019, but traceats did not stop there.

Chen, Accounting Officer in Wuhan, not a seafood seller, bat hunter or laboratory scientist.

In the efforts to trace Covid-19 pandemic origin, all traces officially stopped in Chen, who was identified patients S01, or China's first confirmed NCOV and was included in the investigation report

We really speak too little about the origin of the pandemic.

Even with S01, the patient is most carefully reviewed, the information is also very vague.

S01's records joints with a 41-year-old diagnosed with NCOV in the end of December. But in China's database, this person is reported to be infected on December 16.

Although the whole world wishes to clarify Covid-19, the scientists may take years to learn a new epidemic that is not rare.

However, scientists are trying to seek and collect some clues in further places like Paris or Milan about what may have happened before S01 gathosis.

Health workers sampled Covid-19 tests in Wuhan in May 2020.

Three days before the S01 manifested symptoms, on December 5, 2019, a 4-year-old boy in the outskirts of Milan, Italy was sampled into the epidemic caused by measles.

Researchers in France also found a clue that the virus even appeared earlier since November. A group of French National Health Research Institute and Health and National Institutes checked 9,000 serum samples

We discovered 7 positive volunteers, in which two cases were sampled from the first week of November, Marie Zins, project director, said.

One of the most controversial studies was announced in November, of which ITALY researchers said NCOV may have appeared since September 2019.

The results showed that WHO asked a laboratory in the Netherlands to test again.

Emanuele Montomoli, co-authors studied, hypothesized that they could have discovered that the NCOV strain was less infected than circulating but did not make a big outbreak.

Another study published in Science magazine in April showed that the virus capabilities spread earlier with a small scale.

The identification of the first patients of the Covid-19 pandemic is very difficult.

Chinese officials meant that NCOV was taken to Wuhan from abroad.

In Wuhan, the s01 pre-infection searches do not bring results.

Some scientific groups estimate that the outbreak can begin in October 2019, the time China experienced the worst seasonal flu in the past 10 years, so it was likely that the first cases were omitted.

Some American MPs called to investigate the risk of outbreaks from the Military Olympics, held in October 2019.

There are many rumors around the origin of the pandemic.

Everyone around me has a feeling that the actual number is higher than the official report.

In most of the 2020, CA Covid-19 earliest is said to be a sick Wuhan resident on December 1, 2019.

Security staff outside the Vu Han Virus Institute on February 3.

Nearly 20 months passed since the outbreak in Wuhan at the end of 2019, the origin of Covid-19 is still a controversial issue.

WHO reported that the hypothesis of virus leaked from the laboratory in Wuhan is extremely unlikely.

The origin of NCOV is unclear with two logical hypotheses that it spreads from animals to humans, or due to the incident from the laboratory, Bloom said.

Bloom last month made public opinion notes when announcing to recover 13 gene sequences of the first cases in China, after they suffer from Wuhan scientists from international gene databases but unknown

As a scientist, we have to find a way to gather more data about the earliest cases, he said.

Temple's Professor Pond said that Bloom's report provided information for the process of learning how viruses developed, while emphasizing the hypothesis of a male seafood market hypothesis may not be the only outbreak.

Even if there are only 13 new gene sequences, a little small number, can also significantly change the knowledge of the origin of the pandemic, Pond said.