Fill the blanks: In December 2019, there was a cluster of pneumonia cases in China. Investigations found that it was caused by a previously unknown 1 —now named the 2019 Novel Coronavirus. Coronaviruses consist of a core of genetic material surrounded by an envelope with protein spikes. Respiratory disease can range from the common 2 to pneumonia. And in most people, the symptoms tend to be 3 . However, there are some types of coronaviruses that can cause severe disease. These include the Severe Acute Respiratory Syndrome coronavirus first identified in 4 in 2003 and the Middle East Respiratory Syndrome coronavirus that was first identified in Saudi Arabia in 2012. The 2019 Novel Coronavirus was first identified in China. It initially occurred in a group of people with pneumonia who’d been associated with a 5 and live animal market in the city of 6 . The disease has since spread from those who were sick to others, including family members and 7 staff. There are many cases at present and the disease has spread within China and also to a number of other countries. The exact dynamics of how the virus is transmitted is yet to be determined. In general, respiratory viruses are usually 8 through droplets created when an infected person 9 or sneezes, or through something that has been contaminated with the virus. People most at risk of infection from the Novel Coronavirus are those in close contact with animals, such as live animal market workers, and those who are caring for people 10 with the virus, such as family members or healthcare workers.