COVID-19 pandemic

Disease and virus

COVID-19, caused by the coronavirus SARS-CoV-2^[1][2]

First reported to WHO's attention

Dec 31, 2019, from Wuhan, China^[1]

Declared a pandemic

WHO's assessment of March 11, 2020^[1]

Global emergency ended

May 5, 2023^[3]

Reported cases

779,470,397 (cumulative, reported to WHO)^[4]

Reported deaths

7,117,689 (cumulative, reported to WHO; WHO says the true number is higher)^[4][2]

Estimated excess deaths

22.1 million for 2020 to 2023 (WHO estimate, all excess deaths)^[5]

Origin

Unresolved^[6]

The COVID-19 pandemic is the global outbreak of the disease caused by the coronavirus SARS-CoV-2, first identified in Wuhan, China, at the end of 2019.^[1] Countries have reported more than 7.1 million deaths to the World Health Organization, and WHO estimates that total excess deaths from 2020 to 2023 were about three times the reported number.^[4][5] WHO ended its global health emergency in May 2023, but the virus still circulates, and WHO rated the global public health risk as moderate in its assessment of Aug 6, 2026.^[3][7]

Emergence and spread

On Dec 31, 2019, WHO's office in China picked up a statement from the Wuhan health authorities about cases of viral pneumonia.^[1] WHO published its first outbreak report on Jan 5, 2020, Chinese authorities identified a new coronavirus on Jan 9, and Thailand reported the first case outside China on Jan 13.^[1]

0:16 A mysterious pneumonia in Wuhan NBC News' 2020 timeline opens with the first reports from China and screening at U.S. airports.

WHO declared a public health emergency of international concern on Jan 30, when 18 other countries had 98 cases and no deaths.^[1] It named the disease COVID-19 on Feb 11 and said on March 11 that the outbreak could be characterized as a pandemic.^[1] The virus travels through the air in particles that people release when they breathe, talk, cough or sneeze, and it can pass from people who show no symptoms. WHO says it circulates year-round with no established seasonal pattern.^[2]

1:21 WHO: "can be characterized as a pandemic" Tedros Adhanom Ghebreyesus makes the assessment on March 11, 2020, and explains why pandemic is not a word to use lightly.

Deaths and how they are counted

Two kinds of figure are in use, and they answer different questions. The first is reported deaths: those that countries report to WHO as confirmed COVID-19. WHO's dashboard data, read on Oct 31, 2026, list 7,117,689 such deaths and 779,470,397 cases.^[4] WHO's fact sheet says the real totals are likely higher.^[2] The largest national reported totals are those of the United States (1,239,585), Brazil (704,092), India (533,849), Russia (404,290) and Mexico (335,184), though testing and reporting differ widely between countries.^[4]

The second is excess mortality: all deaths above what would have been expected without the pandemic, whatever the cause on the certificate. WHO estimated in May 2022 that there were about 14.9 million excess deaths in 2020 and 2021 (range 13.3 to 16.6 million), with 84% in South-East Asia, Europe and the Americas and 81% in middle-income countries.^[8] Men accounted for 57% of them.^[8]

World Health Statistics 2026 extends the count to about 22.1 million excess deaths from 2020 to 2023, compared with 7.0 million reported COVID-19 deaths over the same years.^[5] Excess deaths peaked at 10.4 million in 2021 and fell to 3.3 million in 2023, and global deaths ran 6.2% above expected levels in 2020 and 17.9% above in 2021.^[5] The number of excess deaths for each reported death rose from nearly one in 2020 to about nine in 2023.^[5] WHO warns against reading the whole gap as COVID-19 deaths: the figure combines deaths that went unreported with indirect effects, such as disrupted health care, and it links the widening of the gap after 2021 largely to the fall in testing.^[5]

Origin

The origin of SARS-CoV-2 has not been established. WHO's Scientific Advisory Group for the Origins of Novel Pathogens reported on June 27, 2025, that the weight of available evidence pointed to spillover from animals, either directly from bats or through an intermediate host.^[6] It also said much of the information needed to weigh every hypothesis had not been provided, and WHO's Director-General Tedros Adhanom Ghebreyesus said all hypotheses, a laboratory leak included, must remain open.^[6] According to WHO, China has not supplied the early patient sequences, details of animals sold at Wuhan markets, or information on laboratory work and biosafety in Wuhan that WHO requested.^[6]

U.S. intelligence agencies are divided. A declassified report of June 2023 said the National Intelligence Council and four other agencies favored natural exposure to an infected animal, the Energy Department and the FBI favored a laboratory-associated incident, and the CIA and one other agency could not decide; all regarded both explanations as plausible.^[9] Almost all assessed that the virus was not genetically engineered, and all that it was not developed as a biological weapon.^[9] In January 2025 the CIA said a research-related origin was more likely than a natural one, with low confidence in that judgment.^[10]

Governments have taken opposing public positions. In April 2025 the White House under Donald Trump replaced federal COVID-19 sites with a page titled for a lab leak; some virologists quoted by NPR rejected its evidence, while others critical of the market hypothesis welcomed further inquiry.^[11] China's government issued a white paper days later, arguing that the virus may have emerged earlier in the United States, accusing Washington of politicizing the question and citing a joint WHO-China study that called a lab leak extremely unlikely.^[12]

Vaccines and the end of the emergency

Development moved quickly. In April 2020, 130 scientists, funders and manufacturers committed to work with WHO on a vaccine, and by Jan 26, 2021, WHO's landscape listed 63 candidates in clinical development and 173 in preclinical development.^[1]

6:23 The first efficacy results Moderna, Pfizer and Oxford report results in late 2020. NBC's timeline is mostly about the United States.

WHO gave its first emergency use validation for a COVID-19 vaccine, the Pfizer/BioNTech mRNA vaccine, on Dec 31, 2020.^[13] By May 2023, 13.3 billion doses had been given worldwide, and 89% of health workers and 82% of adults over 60 had completed a primary series, with wide regional variation.^[3]

7:21 Fauci takes the vaccine on camera Top U.S. health officials get their first shots in December 2020 to build public confidence.

A modeling study in The Lancet Infectious Diseases estimated that vaccination averted 14.4 million deaths from Dec 8, 2020, to Dec 8, 2021, in 185 countries and territories, measured against reported deaths, and 19.8 million when measured against excess deaths.^[14] These are modeled results, not counts.

WHO's Director-General determined on May 5, 2023, that COVID-19 no longer constituted a global emergency, citing a sustained fall in deaths, hospitalizations and intensive care admissions.^[3] WHO says about 6% of people infected develop post COVID-19 condition, known as long COVID, with lasting symptoms that can include fatigue, memory problems and breathing difficulties.^[2]

Social and economic effects

The World Bank warned in June 2020 of the worst recession since World War II.^[15] It later estimated that the pandemic pushed about 70 million people into extreme poverty in 2020, the largest one-year rise since monitoring began in 1990, and that income losses averaged 4% for the poorest 40% of people, double the losses of the wealthiest 20%.^[16]

2:41 Markets and jobs fall One of Wall Street's worst quarters, and U.S. unemployment of 14.7 percent.

School closures reached 1.6 billion students at their peak. A report by the World Bank, UNESCO and UNICEF projected in December 2021 that the learning lost could cost this generation about US$17 trillion in lifetime earnings.^[17]

Current situation and aftermath

Reporting has thinned considerably. WHO's dashboard shows 61,916 new cases from 61 countries and 692 deaths from 31 countries in the 28 days from Sept 14 to Oct 11, 2026, and it cautions that the data are incomplete.^[18] WHO also notes that blood surveys suggest many infections were never reported.^[7]

The pandemic reshaped global health politics. The United States, citing what it called WHO's failures in handling COVID-19, left the organization on Jan 22, 2026, one year after giving notice.^[19] The World Health Assembly adopted a Pandemic Agreement on May 20, 2025, by 124 votes to none with 11 abstentions in committee, but the treaty cannot open for signature until a separate annex on sharing pathogens and their benefits is agreed, and it takes effect only once at least 60 countries have signed and ratified it.^[20] In May 2026 the assembly extended those talks, with the outcome due at the May 2027 assembly or at a special session in 2026.^[21]

Timeline

1. 2019-12-31 WHO's China office picks up the first reports of viral pneumonia in Wuhan.^[1]
2. 2020-01-09 Chinese authorities identify a novel coronavirus.^[1]
3. 2020-01-13 Thailand reports the first case outside China.^[1]
4. 2020-01-30 WHO declares a public health emergency of international concern.^[1]
5. 2020-02-11 The disease is named COVID-19.^[1]
6. 2020-03-11 WHO says COVID-19 can be characterized as a pandemic.^[1]
7. 2020-12-31 WHO issues its first emergency use validation for a vaccine.^[13]
8. 2022-05-05 WHO estimates 14.9 million excess deaths in 2020 and 2021.^[8]
9. 2023-05-05 WHO ends the global health emergency.^[3]
10. 2025-05-20 The World Health Assembly adopts the Pandemic Agreement.^[20]
11. 2025-06-27 WHO's advisory group reports on origins; all hypotheses stay open.^[6]
12. 2026-01-22 The United States leaves WHO.^[19]