A
Coronaviruses(冠状病毒) are a large group of viruses. In this text, we’ll take a quick look at what’s recently known about the virus.
Covid-2019
The 2019 Novel Coronavirus, first reported December in Wuhan, central China’s Hubei Province, has quickly spread across the country and around the world.
Intermediate hosts (中间宿主) : The Covid-2019 may originate (起源) in bats, a team led by Chinese virologist Shi Zhengli said earlier, but the intermediate host remains unknown.
Incubation period(潜伏期): usually 1-14 days.
Infection: Virus may spread before symptoms show.
SARS-CoV
The SARS coronavirus was first identified in China in 2003.
Intermediate hosts: Bats are the original host.
Incubation period: 2-7 days.
Infection: Virus spread after symptoms show.
MERS-CoV
The MERS(中东呼吸综合征) coronavirus was first identified in Saudi Arabia in 2012.
Intermediate hosts: MERS-CoV was travelled from camel to humans.
Incubation period: 2-14 days.
Infection: Virus may spread before symptoms show.
21. What might be the intermediate hosts of the Covid-2019?
A. Bats. B. Mosquitoes C. Camel. D. Unknown yet.
22. Which kind of coronaviruses spreads after symptoms appear?
A. SARS-CoV. B. MERS-CoV. C. The Covid-2019. D. All Coronaviruses.
23. What can we learn about coronaviruses ?
A. Bats are to blame for the outbreak of all the three coronaviruses.
B. The Covid-2019, SARS-CoV and MERS-CoV are all listed as coronaviruses.
C. Mers-Cov were first identified in China.
D. SARS-Cov has a longer incubation period than Mers-cov.
