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entry · p2026-09-06-291 · validated

CAD4TB chest X-ray screening on ultra-portable X-ray, Nigeria

A total of 94,694 subjects aged 4 years and above were screened for TB
tech
learned-cxr-tb-screening
passes the definition as
a convolutional model fit to labelled chest radiographs that scores each image for tuberculosis abnormality and decides who is sent for a confirmatory molecular test, in place of a clinician's read or a symptom questionnaire
from
2022-01
region
other:NG
domain
health
side
benefit
people
94,694 people (2022-09)
effect
2,337 people (2022-09) — patients diagnosed with tuberculosis out of 94,694 screened in nine months of active case finding, 3.4 percent of them with neither cough nor fever, so found by the model and not by any symptom
reversible
yes
who holds the switch
owner:Nigeria National Tuberculosis and Leprosy Control Programme
attribution
named
source kind
primary
the statistic
Nigeria rolled out ten ultra-portable digital X-ray units running CAD4TB across eight states. Between January and September 2022, 94,694 people aged four and above were screened; 10,236 were flagged presumptive, and 2,337 were diagnosed with TB. The number needed to screen to find one case was 39 in the north and 37 in the south. Average time to diagnosis was 2.0 days and to treatment 4.2 days, with 50.6 percent diagnosed the same day. Among the confirmed cases 3.4 percent were asymptomatic, cough absent in 18.2 percent and fever in 83.2 percent: subclinical TB that a symptom screen cannot reach. In severity, untreated pulmonary TB kills roughly half of those who have it, so a diagnosis plus treatment start is absorbing for the 2,337 and at minimum severe for the screened population as a whole. Nigeria's population in 2022 was 223,150,896 (World Bank).
source
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12257310/
proposed by
researcher (opus), brief 2026-09-06, severe-benefits
received
2026-09-06T17:40:15-04:00
harvest report
impacts/harvest/2026-09-06-severe-benefits.md

Rulings, in order

  1. 2026-09-06T17:40:16-04:00 · validatorpass — quote found on the fetched page (exact match; HTTP 200 text/html; charset=utf-8)
  2. 2026-09-06T17:40:46-04:00 · sessionseverity — A tuberculosis diagnosis and treatment start for 2,337 people, 3.4 percent of them with no symptom at all: untreated TB kills about half, so for the diagnosed this is absorbing — a life saved for some, a disease treated for all. The 94,694 screened got a screening; the count that bore the absorbing effect is the effect's own (Nigeria, 2022).
The proposal as it arrived (JSON)
{
 "id": "p2026-09-06-291",
 "received": "2026-09-06T17:40:15-04:00",
 "proposer": "researcher (opus), brief 2026-09-06, severe-benefits",
 "kind": "entry",
 "sha": "5ccb72b4a813a81d",
 "data": {
  "kind": "entry",
  "tech": "learned-cxr-tb-screening",
  "tech_name": "CAD4TB chest X-ray screening on ultra-portable X-ray, Nigeria",
  "definition": "a convolutional model fit to labelled chest radiographs that scores each image for tuberculosis abnormality and decides who is sent for a confirmatory molecular test, in place of a clinician's read or a symptom questionnaire",
  "region": "other:NG",
  "domain": "health",
  "side": "benefit",
  "from": "2022-01",
  "people": {
   "n": 94694,
   "unit": "people",
   "date": "2022-09"
  },
  "effect": {
   "n": 2337,
   "unit": "people",
   "date": "2022-09",
   "what": "patients diagnosed with tuberculosis out of 94,694 screened in nine months of active case finding, 3.4 percent of them with neither cough nor fever, so found by the model and not by any symptom"
  },
  "reversible": true,
  "switch": "owner:Nigeria National Tuberculosis and Leprosy Control Programme",
  "statistic": "Nigeria rolled out ten ultra-portable digital X-ray units running CAD4TB across eight states. Between January and September 2022, 94,694 people aged four and above were screened; 10,236 were flagged presumptive, and 2,337 were diagnosed with TB. The number needed to screen to find one case was 39 in the north and 37 in the south. Average time to diagnosis was 2.0 days and to treatment 4.2 days, with 50.6 percent diagnosed the same day. Among the confirmed cases 3.4 percent were asymptomatic, cough absent in 18.2 percent and fever in 83.2 percent: subclinical TB that a symptom screen cannot reach. In severity, untreated pulmonary TB kills roughly half of those who have it, so a diagnosis plus treatment start is absorbing for the 2,337 and at minimum severe for the screened population as a whole. Nigeria's population in 2022 was 223,150,896 (World Bank).",
  "source": "https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12257310/",
  "quote": "A total of 94,694 subjects aged 4 years and above were screened for TB",
  "attribution": "named",
  "source_kind": "primary"
 },
 "from_file": "impacts/harvest/2026-09-06-severe-benefits.md"
}