Question

introduction of covid 19
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Answer 1

Answer:

➡On 31 December 2019, the World Health Organization (WHO) was formally notified about a cluster of cases of pneumonia in Wuhan City, home to 11 million people and the cultural and economic hub of central China. By 5 January, 59 cases were known and none had been fatal.1 Ten days later, WHO was aware of 282 confirmed cases, of which four were in Japan, South Korea and Thailand.2 There had been six deaths in Wuhan, 51 people were severely ill and 12 were in a critical condition. The virus responsible was isolated on 7 January and its genome shared on 12 January.3 The cause of the severe acute respiratory syndrome that became known as COVID‐19 was a novel coronavirus, SARS‐CoV‐2. The rest is history, albeit history that is constantly being rewritten: as of 12 May, 82,591 new cases of COVID‐19 worldwide were being confirmed daily and the death rate was over 4200 per day.4......

➡Phylogenetic analysis suggests that SARS‐CoV‐2 originated in animals, probably bats, and was transmitted to other animals before crossing into humans at the Huanan wet market in Wuhan City.5, 6 There is some evidence that the intermediate vector may have been pangolin, a type of nocturnal anteater imported illegally for its flesh. This animal carries a coronavirus that is very similar to SARS‐CoV‐2 but differs in a crucial region that determines viral infectivity and host range. It is therefore possible that the virus passed into humans and then, through adaptation as it infected more people, mutated to acquire the characteristics that made it spread so quickly.....

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Answer 2

Answer:

ans = it is a harmful disease caused by a virus .

the disease is contagious from the country

name China. it goes toward 198 country

of the world like America , Russia , India

and many more .

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