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There are not a few cases of mild or no symptoms when infected with the Corona 19 virus. In China, research has shown that viruses hide their symptoms and are becoming harder and harder to know about the infection.

This is correspondent Chung Sung-yeop in Beijing.

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Researchers at Wuhan University People's Hospital in China analyzed the symptoms of 89 confirmed patients admitted in January.

The two groups were compared: 31 patients admitted in mid-January and 58 patients admitted in late January.

As a result, the rates of coughing, high fever, sputum, and fatigue, typical of corona19 in the group of patients who were hospitalized later, fell far lower than those who were hospitalized first.

Over the course of a week, many of the apparent symptoms of corona have disappeared.

The researchers found that the Corona 19 virus quickly shifted to enhance hiding.

That's why it's harder to see who you are.

Researchers have shown that Corona 19 has been able to linger in the human body for as long as it is without symptoms, like a typical influenza virus.

Other researchers have also shown that women may have a longer incubation period.

China's new corona19 confirmed, with the exception of Wuhan and overseas returnees.

Chinese officials say the Corona 19 vaccine will be available next month.

[Zeng Zhongwei / Head of the National Institute of Medical Science: I have such hope. The vaccine can be used for clinical or emergency situations.]

Sooner or later, it is said that Xi Jinping visited Wuhan, the epicenter of Corona19, which is interpreted as a declaration of victory in the war on defense.