(CNN) -- Here’s some information about the spread of the coronavirus outbreak, declared a pandemic by the World Health Organization. The coronavirus, called Covid-19 by the WHO, originated in China and is the cousin of the SARS virus.
Coronaviruses are a large group of viruses that are common among animals. The viruses can make people sick, usually with a mild to moderate upper respiratory tract illness, similar to a common cold. Coronavirus symptoms include a runny nose, cough, sore throat, possibly a headache and maybe a fever, which can last for a couple of days.
December 31, 2019 - Cases of pneumonia detected in Wuhan, China, are first reported to the WHO. During this reported period, the virus is unknown. The cases occur between December 12 and December 29, according to Wuhan Municipal Health.
January 1, 2020 - Chinese health authorities close the Huanan Seafood Wholesale Market after it is discovered that wild animals sold there may be the source of the virus.
January 5, 2020 - China announces that the unknown pneumonia cases in Wuhan are not SARS or MERS. In a statement, the Wuhan Municipal Health Commission says a retrospective probe into the outbreak has been initiated.
January 7, 2020 - Chinese authorities confirm that they have identified the virus as a novel coronavirus, initially named 2019-nCoV by the WHO.
January 11, 2020 - The Wuhan Municipal Health Commission announces the first death caused by the coronavirus. A 61-year-old man, exposed to the virus at the seafood market, died on January 9 after respiratory failure caused by severe pneumonia.
January 17, 2020 - Chinese health officials confirm that a second person has died in China. The United States responds to the outbreak by implementing screenings for symptoms at airports in San Francisco, New York and Los Angeles.
January 20, 2020 - China reports 139 new cases of the sickness, including a third death. On the same day, the WHO's first situation report confirms cases in Japan, South Korea and Thailand.
January 20, 2020 - The National Institutes of Health announces that it is working on a vaccine against the coronavirus. "The NIH is in the process of taking the first steps towards the development of a vaccine," says Dr. Anthony Fauci, director of the National Institutes of Allergy and Infectious Diseases.
January 21, 2020 - Officials in Washington state confirm the first case on US soil.
January 23, 2020 - At an emergency committee convened by the World Health Organization, the WHO says that the coronavirus does not yet constitute a public health emergency of international concern.
January 23, 2020 - The Beijing Culture and Tourism Bureau cancels all large-scale Lunar New Year celebrations in an effort to contain the growing spread of coronavirus. On the same day, Chinese authorities enforce a partial lockdown of transport in and out of Wuhan. Authorities in the nearby cities of Huanggang and Ezhou Huanggang announce a series of similar measures.
January 28, 2020 - Chinese President Xi Jinping meets with WHO Director General Tedros Adhanom in Beijing. At the meeting, Xi and the WHO agree to send a team of international experts, including US Centers for Disease Control and Prevention staff, to China to investigate the coronavirus outbreak.
January 29, 2020 - The White House announces the formation of a new task force that will help monitor and contain the spread of the virus, and ensure Americans have accurate and up-to-date health and travel information, it says.
January 30, 2020 - The United States reports its first confirmed case of person-to-person transmission of the coronavirus. On the same day, the WHO determines that the outbreak constitutes a Public Health Emergency of International Concern (PHEIC).
February 2, 2020 - A man in the Philippines dies from the coronavirus -- the first time a death has been reported outside mainland China since the outbreak began.
February 4, 2020 - The Japanese Health Ministry announces that ten people aboard the Diamond Princess cruise ship moored in Yokohama Bay are confirmed to have the coronavirus. The ship, which is carrying more than 3,700 people, is placed under quarantine scheduled to end on February 19.
February 7, 2020 - Li Wenliang, a Wuhan doctor who was targeted by police for trying to sound the alarm on a "SARS-like" virus in December, dies of the coronavirus. Following news of Li's death, the topics "Wuhan government owes Dr. Li Wenliang an apology," and "We want freedom of speech," trend on China's Twitter-like platform, Weibo, before disappearing from the heavily censored platform.
February 8, 2020 - The US Embassy in Beijing confirms that a 60-year-old US national died in Wuhan on February 6, marking the first confirmed death of a foreigner.
February 10, 2020 - Xi inspects efforts to contain the coronavirus in Beijing, the first time he has appeared on the front lines of the fight against the outbreak. On the same day, a team of international experts from WHO arrives in China to assist with containing the coronavirus outbreak.
February 10, 2020 - The Anthem of the Seas, a Royal Caribbean cruise ship, sets sail from Bayonne, New Jersey, after a coronavirus scare had kept it docked and its passengers waiting for days.
February 11, 2020 - The WHO names the coronavirus Covid-19.
February 13, 2020 - China's state-run Xinhua News Agency announces that Shanghai mayor Ying Yong will be replacing Jiang Chaoliang amid the outbreak. Wuhan Communist Party chief Ma Guoqiang has also been replaced by Wang Zhonglin, party chief of Jinan city in Shandong province, according to Xinhua.
February 14, 2020 - A Chinese tourist who tested positive for the virus dies in France, becoming the first person to die in the outbreak in Europe. On the same day, Egypt announces its first case of coronavirus, marking the first case in Africa.
February 15, 2020 - The official Communist Party journal Qiushi publishes the transcript of a speech made on February 3 by Xi in which he "issued requirements for the prevention and control of the new coronavirus" on January 7, revealing Xi knew about and was directing the response to the virus on almost two weeks before he commented on it publicly.
February 18, 2020 - Xi says in a phone call with British Prime Minister Boris Johnson that China's measures to prevent and control the epidemic "are achieving visible progress," according to state news Xinhua.
February 21, 2020 - The CDC changes criteria for counting confirmed cases of novel coronavirus in the United States and begins tracking two separate and distinct groups: those repatriated by the US Department of State and those identified by the US public health network.
February 25, 2020 - The NIH announces that a clinical trial to evaluate the safety and effectiveness of the antiviral drug remdesivir in adults diagnosed with coronavirus has started at the University of Nebraska Medical Center in Omaha. The first participant is an American who was evacuated from the Diamond Princess cruise ship docked in Japan.
February 25, 2020 - In an effort to contain the largest outbreak in Europe, Italy's Lombardy region press office issues a list of towns and villages that are in complete lockdown. Around 100,000 people are affected by the travel restrictions.
February 26, 2020 - CDC officials say that a California patient being treated for novel coronavirus is the first US case of unknown origin. The patient, who didn't have any relevant travel history nor exposure to another known patient, is the first possible US case of "community spread."
February 26, 2020 - President Trump places Vice President Mike Pence in charge of the US government response to the novel coronavirus, amid growing criticism of the White House's handling of the outbreak.
February 29, 2020 - A state health official announces that a patient infected with the novel coronavirus in Washington state has died, marking the first death due to the virus in the United States.
March 3, 2020 - The Federal Reserve slashes interest rates by half a percentage point in an attempt to give the US economy a jolt in the face of concerns about the coronavirus outbreak. It is the first unscheduled, emergency rate cut since 2008, and it also marks the biggest one-time cut since then.
March 3, 2020 - Officials announce that Iran will temporarily release 54,000 people from prisons and deploy hundreds of thousands of health workers as officials announced a slew of measures to contain the world's deadliest coronavirus outbreak outside China. It is also announced that 23 members of Iran's parliament tested positive for the virus.
March 4, 2020 - The CDC formally removes earlier restrictions that limited coronavirus testing of the general public to people in the hospital, unless they had close contact with confirmed coronavirus cases. According to the CDC, clinicians should now "use their judgment to determine if a patient has signs and symptoms compatible with COVID-19 and whether the patient should be tested."
March 8, 2020 - Italian Prime Minister Giuseppe Conte signs a decree placing travel restrictions on the entire Lombardy region and 14 other provinces, restricting the movements of more than 10 million people in the northern part of the country.
March 9, 2020 - Conte announces that the whole country of Italy is on lockdown.
March 11, 2020 - The WHO declares the novel coronavirus outbreak to be a pandemic. WHO says the outbreak is the first pandemic caused by a coronavirus. In an Oval Office address, Trump announces that he is restricting travel from Europe to the United States for 30 days in an attempt to slow the spread of coronavirus. The ban, which applies to the 26 countries in the Schengen Area, applies only to foreign nationals and not American citizens and permanent residents who'd be screened before entering the country.
March 18, 2020 - Trump signs into law a coronavirus relief package that includes provisions for free testing for Covid-19 and paid emergency leave.
March 19, 2020 - At a news conference, officials from China's National Health Commission report no new locally transmitted coronavirus cases for the first time since the pandemic began.
March 25, 2020 - The White House and Senate leaders reach an agreement on a $2 trillion stimulus deal to offset the economic damage of coronavirus, producing one of the most expensive and far-reaching measures in the history of Congress.
March 27, 2020 - Trump signs the stimulus package into law.
April 2, 2020 - According to the Department of Labor, 6.6 million US workers file for their first week of unemployment benefits in the week ending March 28, the highest number of initial claims in history. Globally, the total number of coronavirus cases surpasses 1 million, according to Johns Hopkins University's tally.
April 3, 2020 - Trump says his administration is now recommending Americans wear "non-medical cloth" face coverings, a reversal of previous guidance that suggested masks were unnecessary for people who weren't sick.
April 8, 2020 - China reopens Wuhan after a 76-day lockdown.
April 14, 2020 - Trump announces he is halting funding to the WHO while a review is conducted, saying the review will cover the WHO's "role in severely mismanaging and covering up the spread of coronavirus."
April 20, 2020 - Chilean health officials announce that Chile will begin issuing the world's first digital immunity cards to people who have recovered from coronavirus, saying the cards will help identify individuals who no longer pose a health risk to others.
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