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.

【小题1】What might be the intermediate hosts of the Covid-2019?

A．Bats.

B．Mosquitoes

C．Camel.

D．Unknown yet.

【小题2】Which kind of coronaviruses spreads after symptoms appear?

A．SARS-CoV.

B．MERS-CoV.

C．The Covid-2019.

D．All Coronaviruses.

【小题3】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.