The coronavirus outbreak has sickened more than 97,800 people, according to official counts. As of Thursday evening, at least 3,344 people have died, all but 331 in mainland China.
As these maps show, the disease has been detected in at least 81 countries.
Sustained local transmission of the virus has been reported in South Korea, Japan, Italy and Iran, raising fears of a global pandemic. The C.D.C. has advised against all non-essential travel to South Korea, China, Italy and Iran. And the agency has warned older and at-risk travelers to avoid Japan.
|REGION||CONFIRMED CASES||DEATHS||C.D.C. RISK LEVEL|
|South Korea||6,088||35||Avoid travel|
The number of known coronavirus cases in the United States continues to grow quickly. As of Thursday evening, there have been at least 211 cases of coronavirus confirmed by lab tests and 12 deaths, according to a New York Times database.
Many of the people infected in the United States are former passengers of the Diamond Princess cruise ship who are currently in quarantine on military bases or in hospitals.
Several people in the United States are infected despite having no known connection to previous cases, which suggests local, person-to-person spread of the virus. C.D.C. officials warned on Tuesday that future outbreaks are almost inevitable, given the number of cases around the world.
Reports of new infections outside of China have accelerated in recent days, outpacing new cases in China for the first time. China still accounts for most of the cases reported overall since the beginning of the outbreak.
The outbreak is believed to have begun in a seafood and poultry market in Wuhan, a city of 11 million people in central China. The virus is readily transmitted from person to person, scientists believe. But it’s unclear how far the virus will spread and how lethal it is.
Not all infected people have received a diagnosis, and some countries, like Singapore and the United States, have more proactive testing and containment efforts than others do.
Follow the latest updates on the coronavirus outbreak.
The precise dimensions of the outbreak are hard to know, especially in China, which has changed its definition of a “confirmed” case several times.
Total confirmed coronavirus cases
Many of the cases across Europe have been traced back to Italy, which has one of the world’s largest outbreaks. At least 3,858 people have tested positive as of Thursday evening.
While the outbreak is a serious public health concern, most people who contract the coronavirus do not become seriously ill, and only a small percentage require intensive care. Older people and those with existing health conditions, like heart disease or diabetes, are at higher risk.
Experts’ understanding of how the virus spreads is still limited, but there are four factors that likely play a role: how close you get; how long you are near the person; whether that person projects viral droplets on you; and how much you touch your face.
If your community is affected, you can help reduce your risk and do your part to protect others by following some basic steps:
Wash your hands! Scrub with soap and water for at least 20 seconds, and then dry them with a clean towel or let them air dry.
Keep distance from sick people. Try to stay six feet away from anybody showing flu- or cold-like symptoms, and don’t go to work if you’re sick.
Prepare your family, and communicate your plan about evacuations, resources and supplies. Experts suggest stocking at least a 30-day supply of any needed prescriptions. Consider doing the same for food staples, laundry detergent and diapers, if you have small children.
Here’s a complete guide on how you can preparefor the coronavirus outbreak.