- The coronavirus outbreak that originated in Wuhan, China has spread to at least 110 other countries.
- The disease, named COVID-19, has killed more than 4,700 people and infected more than 127,000. (For the latest case total and death toll, see Business Insider's live updates here.)
- Here's what to know about the coronavirus — including symptoms, spread, and travel warnings — in 16 charts and graphics.
The World Health Organization declared the novel coronavirus a pandemic on Wednesday; cases have been reported in more than 110 countries.
In the US — which has recorded over 1,500 cases and 38 deaths — the virus has spread to 45 states and Washington, DC.
On Wednesday, President Donald Trump announced a 30-day travel ban for people traveling from Europe, excluding the United Kingdom. US citizens and permanent residents, along with their immediate families, will be exempt.
Since the first case of COVID-19 — the disease caused by the virus — was reported in December, more than 127,000 people have been infected, and 4,700 have died.
About 80% of cases are mild, according to one study, but older people with preexisting health issues are more at risk of severe complications like difficulty breathing and lung infections.
These 14 charts and graphics lay out what to know as the outbreak continues to progress.
Here's where cases have been confirmed so far — and where patients have recovered:
The majority of cases have been in China: about 63%. But as China sees a drop-off in its rate of new cases, the virus has gained momentum in other parts of the globe.
Italy and El Salvador have declared nationwide lockdowns.
As the number of new cases in China has decreased, other countries have begun to experience surges in cases.
The US has reported over 1,500 coronavirus cases.
The US has reported 38 deaths from the coronavirus as of Wednesday: 30 in Washington state, four in California, two in Florida, one in New Jersey, and one in South Dakota.
Washington has confirmed 373 cases of the virus and 30 deaths. More than 50 residents of a nursing facility in King County called Life Care Center have tested positive. Nineteen of the Washington deaths are linked to the long-term care facility.
In total, the country has reported 1,552 cases of the coronavirus across at least 45 states and Washington, DC.
That includes 44 repatriated citizens who were on the quarantined Diamond Princess cruise ship in Japan and three people who were evacuated from Wuhan.
The US State Department and CDC have issued travel warnings for countries affected by the coronavirus.
Currently, China, South Korea, Iran, and much of Europe are at Level 3, meaning the CDC recommends avoiding non-essential travel to those countries.
This chart shows the rate at which the coronavirus case total has shot up worldwide.
The true number of infected people is probably still higher than the official total, since some mild and asymptomatic cases are likely not tested and counted.
The total number of cases and deaths have far surpassed those of the SARS outbreak.
The coronavirus most seriously affects older people.
The disease's death rate is highest among more elderly groups. The study this data comes from did not report any deaths in children younger than 10, who represented less than 1% of the patients studied.
The coronavirus also poses a higher risk to people with pre-existing health conditions, such as diabetes, heart disease, and high blood pressure.
Among coronavirus patients, the preexisting condition with the highest death rate appears to be heart disease. Patients already diagnosed with heart disease had a death rate of more than 10%. Diabetes was the preexisting condition with the second-highest fatality rate: 7%.
Patients with the most commonly reported preexisting condition, hypertension (high blood pressure), had a death rate of 6%. Coronavirus patients with cancer had a similar death rate.
The flu and the new coronavirus have some similar symptoms, and both disproportionately affect older people. However, across the board, the coronavirus has been far deadlier.
The most crucial difference between the flu and the coronavirus is that the latter has been far deadlier. Whereas about 0.1% of people who get the flu die, the coronavirus' death rate is now at about 3.4%, based on the current numbers of cases and deaths.
The fatality rate of the novel coronavirus is still evolving, however, as more cases are confirmed. Many health experts believe that the rate will drop as the number of cases rises.
The death rates used above are based on data from the Chinese CDC.
South Korea so far has lower overall coronavirus death rates than other countries and than the global average. But there, too, the coronavirus is still more deadly.
The coronavirus' pneumonia-like symptoms include fever and difficulty breathing.
Scientists have found that the virus' average incubation period — the length of time between when a person gets infected and when they test positive for the illness — is five days.
The new research also showed that 97.5% of people who are infected develop symptoms within 11.5 days. About 1% of patients, however, show symptoms after 14 days — outside the window of the CDC's quarantine guidelines.
Some symptoms of COVID-19 overlap with those of the common cold, allergies, and the flu, which can make it tricky to diagnose without a test.
The coronavirus primarily affects the lungs and commonly causes a fever, a dry cough, and shortness of breath. Just over 80% of coronavirus cases are "mild," according to an analysis from the Chinese Center for Disease Control and Prevention.
As of Sunday, the US had done less coronavirus testing per capita than most other countries with outbreaks.
As of Thursday, 10,000 Americans had been tested for the novel coronavirus, though not all have received results yet, according to the CDC. That's about 30 tests per million people, which still makes the US the lowest on the chart above.
It's likely that the US has done more tests than the CDC's reported figure shows, however, since the agency isn't tallying tests performed at state and private labs in the past week.
Social distancing and other preventative measures could keep the outbreak within the capacity of the US healthcare system. Otherwise, facilities and staff are at risk of being overrun.
Pleas to help "flatten the curve" are becoming common as the US looks for ways to curb the spread of the virus.
The idea is to reduce the number of people who are sick at the peak of the virus's spread so that the health system isn't overwhelmed and more people can get life-saving care. This is the reason for the rising number of school closures, cancellations of major events, and companies that are mandating employees work from home.
Holly Secon and Aria Bendix contributed reporting to this story.
Read next on Business Insider: 80% of COVID-19 patients experience 'mild' symptoms — but that likely still involves a fever and cough