Yemen: Polio Outbreak
Polio
How the score is calculated
The score starts at 8. It adds points from recorded affected, deaths, displaced and casualty counts, plus terms found in the story title, event type or status. For each count, only its highest matching band is used.
- Affected people
- 1–999: +5 · 1,000–9,999: +12 · 10,000–99,999: +20 · 100,000–999,999: +28 · 1 million+: +35
- Deaths
- 1–9: +8 · 10–99: +14 · 100–999: +22 · 1,000+: +30
- Displaced people
- 1–9,999: +6 · 10,000–99,999: +12 · 100,000+: +18
- Casualties
- 100 or more: +8
- Story wording
- +10 for terms such as catastrophe, famine, war, conflict, major earthquake, mass casualty or critical. Otherwise, +5 for active, ongoing, emergency, outbreak, cyclone or hurricane.
Score bands: Watch 0–24 · Moderate 25–49 · High 50–74 · Critical 75–100. Scores are capped at 100. Missing or unparseable figures add no points.
This is a rule-based WorldsAid triage indicator, not an official or independently validated classification. It does not account for recency or local context, and it can understate events with incomplete reporting. Check the linked sources.
Historical record
Status: CLOSED · Imported 2026-10-07
Closed for this historical import at the site owner’s request; not a new assessment of current conditions.
In brief
- What happenedA polio outbreak has been declared in Yemen following 15 reported cases of vaccine derived poliovirus type 1 (cVDPV1) in the first weeks of August 2020.
- How many affectedAffected persons: 15
- What help is neededResponse priorities should be confirmed in the linked source reports as needs change.
What changed
First retained snapshot
No earlier verified snapshot is present in the recovered dataset. This record remains available as the historical baseline.
Situation
A polio outbreak has been declared in Yemen following 15 reported cases of vaccine derived poliovirus type 1 (cVDPV1) in the first weeks of August 2020. The cases were detected in different districts of Sa’ada Governorate, in the north-west of the country. Children aged from 8 months to 13 years are affected. Significant challenges and delays in the shipment of stool samples from Yemen during the last two years have resulted in delayed detection. An outbreak response is being implemented by UNICEF and WHO in support of the local health authorities. Local impediments, including security, limit the application of internationally recommended protocol of house-to-house vaccination campaigns. ( ECHO, 25 Aug 2020 ) The cases in Yemen are clustered in the Sa'adah governorate in the war-ravaged country's north-west, an area that has very low routine immunization levels and which has been inaccessible to the polio programme for more than 2 years. The last house-to-house campaigns in this area were nearly 2 years ago, in November 2018. ( UNICEF/WHO, 11 Sep 2020 )
Linked charities and agencies
WorldsAid verification
A WorldsAid editor reviewed this record against the retained source record, cleaned feed formatting and checked the crisis, place and reporting date. 1 human-impact figure was separated from the narrative and dated where the source allowed. Earlier observations remain in the evidence history instead of being silently overwritten.
Verified figures
- Affected persons
- 15 retained at 2020-09-14
What we knew when
- WorldsAid record entered the retained historical dataset.
- Last verification represented by this immutable snapshot.
Earlier figures are never replaced by later values; additional observations are retained as new ledger entries.
Provenance
This page renders the last verified WorldsAid cache directly in HTML. It does not treat generated summaries as primary evidence.
Cached dataset: worldsai_drup771.sql.gz
Verified
SHA-256 be4dfa2b320ccfe3a4abcb8c5c046aa5de30939beaa1ca362481e3e05ee2f571No external source link was stored for this record.