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Volume 31, Number 2—February 2025
Research
Global Epidemiology of Outbreaks of Unknown Cause Identified by Open-Source Intelligence, 2020–2022
Damian Honeyman, Deepti Gurdasani, Adriana Notaras, Zubair Akhtar, Jared Edgeworth, Aye Moa, Abrar Ahmad Chughtai, Ashley Quigley, Samsung Lim, and Chandini Raina MacIntyre
Table 5
Ten most frequent signs/symptoms reported during outbreaks of unknown cause identified by open-source intelligence, 2020–2022*
| Symptoms | Frequency, no. (%) |
|---|---|
| Fever | 90 (21.6) |
| Diarrhea | 62 (14.9) |
| Vomiting | 56 (13.4) |
| Breathing difficulties | 41 (9.8) |
| Headache | 22 (5.3) |
| Cough | 16 (3.8) |
| Nausea | 16 (3.8) |
| Stomachache | 13 (3.1) |
| Peripheral swelling | 11 (2.6) |
| Hemorrhagic fever | 10 (2.4) |
*Total 417 outbreaks with clinical signs/symptoms reported.
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Page updated: January 21, 2025
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