Question

Please Tell This Question

Answer 1

Answer:

ok here is the research paper

Explanation:

Human coronaviruses, first characterized in the 1960s, are responsible for a substantial proportion of upper respiratory tract infections in children. Since 2003, at least 5 new human coronaviruses have been identified, including the severe acute respiratory syndrome coronavirus, which caused significant morbidity and mortality. NL63, representing a group of newly identified group I coronaviruses that includes NL and the New Haven coronavirus, has been identified worldwide. These viruses are associated with both upper and lower respiratory tract disease and are likely common human pathogens. The global distribution of a newly identified group II coronavirus, HKU1, has not yet been established. Coronavirology has advanced significantly in the past few years. The SARS epidemic put the animal coronaviruses in the spotlight. The background and history relative to this important and expanding research area are reviewed here:

HISTORY

The history of human coronaviruses began in 1965 when Tyrrell and Bynoe1 found that they could passage a virus named B814. It was found in human embryonic tracheal organ cultures obtained from the respiratory tract of an adult with a common cold. The presence of an infectious agent was demonstrated by inoculating the medium from these cultures intranasally in human volunteers; colds were produced in a significant proportion of subjects, but Tyrrell and Bynoe were unable to grow the agent in tissue culture at that time. At about the same time, Hamre and Procknow2 were able to grow a virus with unusual properties in tissue culture from samples obtained from medical students with colds. Both B814 and Hamre's virus, which she called 229E, were ether-sensitive and therefore presumably required a lipid-containing coat for infectivity, but these 2 viruses were not related to any known myxo- or paramyxoviruses. While working in the laboratory of Robert Chanock at the National Institutes of Health, McIntosh et al3 reported the recovery of multiple strains of ether-sensitive agents from the human respiratory tract by using a technique similar to that of Tyrrell and Bynoe. These viruses were termed “OC” to designate that they were grown in organ cultures.

Now India Under Lockdown:

India, 1.3 billion people were confined to their homes with just four hours' notice as the country embarked on the world's biggest lockdown.

Tens of millions of migrant workers suddenly found themselves jobless, quickly running out of money and food, and unable to return to their villages across India.

On 24 March 2020, the Government of India under Prime Minister Narendra Modi ordered a nationwide lockdown for 21 days, limiting movement of the entire 1.3 billion population of India as a preventive measure against the COVID-19 pandemic in India. It was ordered after a 14-hour voluntary public curfew on 22 March, followed by enforcement of a series of regulations in the country's COVID-19 affected regions.The lockdown was placed when the number of confirmed positive coronavirus cases in India was approximately 500.[1] Observers stated that the lockdown had slowed the growth rate of the pandemic by 6 April to a rate of doubling every six days, and by 18 April, to a rate of doubling every eight days.

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Answer 2

Explanation:

• covid-19 was first attacked on China in the city of Wuhan. it was identified in December 2019. the first confirmation case has been traced to November 2019 .
• it spreaded in most of the countries of the world most infected countries are America , Spain , France, Italy and India too.
• lockdown is good for the prevention of the covid-19 but it has big impact on common man and economic. due to the lockdown many people who depended on the daily wages due to lockdown they are in big problem like shortage of food and money. Indian economy gone down to lockdown as the people were not allowed to go out of home
• three red zone: Maharashtra , Delhi and Gujarat
• zones you can search on Google
• five countries:

1. America
2. France
3. Spain
4. Italy
5. India

I hope this will help you

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