Outbreak Archive
Detailed records of major infectious disease outbreaks and pandemics from 2003 to present. Each page contains epidemiological data, timeline, affected countries, response measures, and WHO source references.
WHO declared a Public Health Emergency of International Concern in August 2024 as Mpox Clade Ib spread across the DRC and neighbouring countries in Central and East Africa.
2023 set global records for dengue cases with over 6.5 million cases reported, driven by El Niño conditions, expanding Aedes aegypti range, and post-COVID surveillance recovery.
Mpox (formerly monkeypox) Clade IIb spread globally from May 2022 reaching 110+ countries. WHO declared a PHEIC in July 2022. Over 90,000 confirmed cases before the outbreak declined in late 2022.
SARS-CoV-2 emerged in late 2019, with the WHO declaring a pandemic on March 11, 2020. The first wave caused mass lockdowns across 180+ countries and overwhelmed healthcare systems worldwide.
The second-largest Ebola outbreak in history. Over 3,400 cases in the DRC's North Kivu and Ituri provinces during an active armed conflict, hindering response and vaccination campaigns.
19 confirmed cases and 17 deaths in Kozhikode and Malappuram districts. India's response — rapid isolation, contact tracing, and fruit bat education — was cited by WHO as a model containment effort.
WHO PHEIC declared in February 2016 after explosive Zika spread through Brazil and the Americas. Linked to thousands of microcephaly cases and Guillain-Barré syndrome, prompting global pregnancy travel advisories.
The largest Ebola epidemic in history — 28,616 cases and 11,325 deaths across Guinea, Sierra Leone, and Liberia. The outbreak drove development of the first approved Ebola vaccine, rVSV-ZEBOV.
The first pandemic of the 21st century. A novel influenza A (H1N1)pdm09 strain emerged in Mexico, spread globally within weeks, and ultimately caused an estimated 150,000–575,000 deaths in its first year.
Severe Acute Respiratory Syndrome spread from China to 29 countries in 2003, killing 774 people with an 11% CFR. The outbreak reshaped global health regulations and accelerated the 2005 International Health Regulations revision.