Nine people have died from the new type of coronavirus, and 440 cases have been confirmed in China, Chinese health officials said at a press conference on Wednesday.

Click here for the latest numbers of the pneumonia outbreak.

All the deaths occurred in Hubei Province, of which Wuhan is the provincial capital, according to an official.

Gao Fu, director of the Chinese Center for Disease Control and Prevention, also confirmed the source of the new coronavirus, saying it was transmitted via wild animals illegally sold at a seafood market in Wuhan.

Here are some more answers from the Chinese authorities to crucial questions about the outbreak:

Q1: Why is there a dramatic rise in the number of confirmed cases lately? Is it because of some new testing methods? 

A: (Gao Fu, director of the Chinese Center for Disease Control and Prevention)

It is a fact that the number of confirmed cases is increasing, and yes, we are using new testing methods. Developing our knowledge of the new virus is also a gradual process.

Q2: Is the new coronavirus more contagious and virulent than SARS and MERS?

A: (Zhong Nanshan, the expert who discovered the SARS virus during an outbreak in China in 2003)

It's not as contagious and virulent as SARS. I think there's a difference between the severity and the spread of the disease between the new coronavirus and SARS.

A: (Gao Fu, director of the Chinese Center for Disease Control and Prevention)

Including the new one, there are altogether seven coronaviruses that can infect humans. Of the six already known, four are lowly pathogenic to humans, and everyone knows the other two - SARS and MERS - are quite serious. We are still learning about the new virus. 

Q3: How can we contain the virus during the Spring Festival holiday?

A: (Li Bin, deputy director of the National Health Commission)

Because of the high personnel mobility during the Spring Festival, China has raised the epidemic prevention and control to a national level and made institutional arrangements. 

Governments at all levels in China and various departments have strengthened the implementation of various prevention and control measures. It is recommended that people outside Wuhan should not go to the city, and Wuhan residents should not leave the city without special circumstances. 

Q4: What do we know so far about the new type of coronavirus, such as its origin, incubation period and severity?  

A: (Gao Fu, director of the Chinese Center for Disease Control and Prevention)

We are still in the process of learning more about this virus. It appears to have some characteristics of common coronaviruses but also exhibits some special features. We have confirmed it was transmitted via wild animals illegally sold at a seafood market in Wuhan.

At first, it was spread from animals to humans. However, the virus has since been mutating and has become adaptive to its host. Human-to-human transmission has occurred, and there has been some community transmission. That is to say, it has gone through three stages.

We are still deepening the study on it. So far, children and young people are less likely to be infected.

Q5: Are there super-spreaders of the coronavirus? As we all know, back in 2003, the emergence of super-spreaders of SARS caused the rapid deterioration of the situation. Will this disease turn out to be another SARS-like epidemic?

A: (Gao Fu, director of the Chinese Center for Disease Control and Prevention)

There's no evidence to support the idea there are already super-spreaders. This is a scientific issue that we will keep monitoring closely. It's also a very important direction that guides us in the prevention and control of the virus. 

Note: A super-spreader is a highly contagious virus carrier. It could infect more secondary contacts than other hosts who are also infected with the same disease.

Q6: A study by a UK university estimated that 2,000 people have been infected in China. Have you ever predicted the number of infected people who are not being treated?

A: (Gao Fu, director of the Chinese Center for Disease Control and Prevention)

I think any question like that must be based on science. First of all, the calculation, which I also read, is a mathematical model. The number you just asked about is the highest estimate that the model has predicted. In order to know the exact casualty caused by a new virus, facts should be ascertained by the available numbers and it should not be based on theories.

What we've learned about the real situation is not in line with the model by the British scientist. 

Q7: Was early information disclosure insufficient? Has the government concealed some part of the whole picture? 

A: (Xu Shuqiang, director of the Emergency Management Office at the National Health Commission)

We attach great importance to information disclosure. After the outbreak, the National Health Commission directed the Wuhan Municipal Health Committee to release the latest situation on December 31, 2019, and January 3, 5, and 9, 2020. 

As the situation has changed, daily updates started on January 11. On January 9, the National Health Commission instantly released the finding that the pathogen is a new type of coronavirus. 

Recently, cases have been reported in areas outside Wuhan, Hubei Province. In order to inform the public of the latest, accurate and comprehensive situation, the commission has been collecting and publishing the number of confirmed and suspected cases in various provinces across the country daily, starting from January 20, which can be found on our official website. The daily updates will continue, including during the Spring Festival holiday, until it is no longer needed. 

(Video by CGTN's Wu Guoxiu. Liu Yuyao also contributed to the story.)