A
Coronaviruses ( 冠状病毒)
Coronaviruses are a large group of viruses. They consist of a core of genetic material(遗传物质) surrounded by an envelope with protein spikes(蛋白棘突). This gives it the appearance of a crown. Crown in Latin is called “corona” and that’s how these viruses get their name. In this text, we’ll take a quick look at what’s currently 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. It initially occurred in a group of people with pneumonia(肺炎) who’d been associated with a seafood and live animal market in the city of Wuhan.
Intermediate hosts(中间宿主）: The Covid-2019 may originate in bats, a team led by renowned Chinese virologist Shi Zhengli said earlier, while the intermediary host remains unknown.
Incubation period( 潜伏期): usually 1-14 days.
Infection: Virus may spread before symptoms show.
SARS-CoV
The Severe Acute Respiratory Syndrome (SARS) coronavirus was first identified in China in 2003.
Intermediate hosts: Bats are the original host. Civet cats serve as an important intermediary that carries virus from the winged mammal to humans.
Incubation period: 2-7 days.
Infection: Virus spread after symptoms show.
MERS-CoV
The Middle East Respiratory Syndrome (中东呼吸综合征) coronavirus was first identified in Saudi Arabia in 2012.
Intermediate hosts: MERS-CoV was travelled from dromedary camel to humans.
Incubation period: 2-14 days.
Infection: Virus may spread before symptoms show.
21. What are the intermediate hosts of the Covid-2019?
A. Bats. B. Unknown yet. C. Camel. D.Civet cats.
22. Which kinds of coronaviruses may spread before symptoms show?
A. The Covid-2019 B. SARS-CoV C. MERS-CoV D. The Covid-2019 and MERS-CoV
23. What is the following statement is true about coronaviruses?
A. Bats are the original hosts of all the three coronaviruses.
B. The three coronaviruses were all first identified in China.
C. The Covid-2019, SARS-CoV and MERS-CoV are all included in coronaviruses.
D. The coronaviruses have the same incubation period length.
