CNN News:武汉爆发新型冠状病毒 可能存在人传人现象

In terms of total area, which of these countries is the smallest? Russia, Canada, United States or China. These countries are listed in order by size with Russia being the biggest and China being the smallest.
It's still massive at more than 3.7 million square miles and China is the world's most populated country with more than 1 billion 380 million people.

That's why there's some international concern about a mysterious new virus that's sprouted up there. The disease itself has been labeled a coronavirus. It's a type of virus that can cause respiratory problems. It was first detected more than a month ago in Wuhan a province of central eastern China. So far more than 40 people have gotten sick from it and two have died. Chinese health officials say most of the patients in Wuhan had been to a large seafood and animal market there. But because some of them had not been to the market, the U.S. Centers for Disease Control says the virus may be spreading from person to person. The CDC says this is not something Americans should be worried about and that common bugs like the flu are a much bigger threat. But health officials are planning to check passengers at three U.S. airports who've arrived from Wuhan China.