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ORPHA:169085

Susceptibility to respiratory infections associated with CD8alpha chain mutation

low confidenceDisorder

Also known as: Familial CD8 deficiency

Query health: suspect — Only one of 2 strategies returned hits (phrase).

Publications

28,355

Trials

0

Interventional, condition-specific

Researchers

41

Distinct authors in sample

Gene link

CD8A

Strong

Readiness

3/6

Stages with a signal

Clinical definition (Orphanet)

A rare primary immunodeficiency due to a defect in adaptive immunity characterized by the absence of CD8+ T cells with normal immunoglobulin and specific antibody titres in blood and susceptibility to recurrent respiratory bacterial and viral infections. Symptom severity range from fatal respiratory insufficiency to mild or asymptomatic phenotypes.

How rare: <1 / 1 000 000 — fewer than one in a million. In a city the size of Kolkata, that might mean on the order of fifteen people.

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (2)

familial CD8 deficiency · susceptibility to respiratory infections associated with CD8alpha chain mutation

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

3/6 stages with a signal

No matched interventional trial; the gene is known and literature exists — preclinical or natural-history work may still be the practical next step.

  1. Gene identifiedPresent

    Strong — CD8A

  2. LiteraturePresent

    28,355 matched papers (23,584 in last 10 years) Source

  3. Phenotype characterisedPresent

    5 HPO annotations (e.g. Recurrent respiratory infections; Absence of CD8+ T cells; Recurrent viral infections) Source

  4. Animal modelNot found

    No Alliance genotype “model of” associations via Monarch for these Mondo IDs

  5. Orphan designationNot found

    No FDA or EMA orphan-drug designation matched this disease via UMLS or preferred name Source

  6. Interventional trialNot found

    No matched interventional trial under our ClinicalTrials.gov rules

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Yes — we know a specific gene responsible (CD8A).

GenCC classification: Strong.

Phenotypes (Monarch / HPO)

5

Associated phenotypes · MONDO:0012161

  • Recurrent respiratory infections
  • Absence of CD8+ T cells
  • Recurrent viral infections
  • Bronchiectasis
  • Recurrent bacterial infections

Animal models (Monarch / Alliance)

None returned for this Mondo ID. Empty here is not proof that no model organism work exists under another name or gene.

Monarch fetch 2026-07-29

Therapies

Designations, candidates, and chemicals

FDA OOPD and EMA orphan designations, Open Targets clinical candidates, and CTD chemical associations via MyDisease.info. These never change the interventional-trial headline.

Orphan designation (FDA · EMA)

No designation matched this disease via UMLS or preferred name on the FDA OOPD mirror or EMA orphan register. Absence here is not proof that none exists under another wording.

Open Targets candidates

No drugs or clinical candidates returned for this Mondo ID on Open Targets.

CTD chemicals (MyDisease.info)

No CTD chemical associations returned for this Mondo ID.

Literature

Is anyone studying this?

28,355

28,355 papers — among the better-studied rare conditions, though still a fraction of common-disease literature (breast cancer: over 700,000). Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=3967) is 59.

28,355 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 59 (publications denominator n=3967).

23,584 in the last 10 years · low confidence

Phrase hits: 5 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

41

Distinct author names in 5 sampled papers — named people below.

Who's working on it?

No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.

  1. 01
    Aliu N1 paper · 2023

    Department of Human Genetics, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland.

    Papers in Europe PMC
  2. 02
    Arostegui JI1 paper · 2001
    Papers in Europe PMC
  3. 03
    Caragol I1 paper · 2001
    Papers in Europe PMC
  4. 04
    Carneiro-Sampaio M1 paper · 2007

    Children's Hospital, Faculdade de Medicina da Universidade de São Paulo, Av. Dr. Enéas Carvalho Aguiar 647, 05403-900 São Paulo, Brazil. magdascs@icr.hcnet.usp.br

    Papers in Europe PMC
  5. 05
    Casamitjana N1 paper · 2001
    Papers in Europe PMC
  6. 06
    Collins EJ1 paper · 2008
    Papers in Europe PMC
  7. 07
    Coutinho A1 paper · 2007
    Papers in Europe PMC
  8. 08
    de la Calle-Martin O1 paper · 2001

    Department of Immunology, Hospital de la Santa Creu i Sant Pau, Barcelona, Spain. odlcalle@hsp.santpau.es

    Papers in Europe PMC
  9. 09
    Du L1 paper · 2023

    BGI-Wuhan Clinical Laboratory, BGI-Shenzhen, 430074, Wuhan, China.

    Papers in Europe PMC
  10. 10
    Escher P1 paper · 2023

    Department of Ophthalmology, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

0

interventional trials for this specific condition

No interventional trial testing a treatment matched this specific condition name on ClinicalTrials.gov (observational studies and pan-disease registries are listed separately when present).

Data as of 11 September 2026 · last trial check 11 September 2026

No matched interventional trials. This is true for 77.2% of diseases in the trials denominator (5501 of 7126). Here are the researchers publishing on it.

low confidence · 38.6th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.

See who's working on it — people publishing on this disease are often the practical next contact when no trial is listed.

Other registries (secondary)

Broader net from EU CTIS, ISRCTN, and ICTRP when available — deduped against ClinicalTrials.gov IDs already counted above. Dual-model LLM relevance gates what we keep. These rows are not added to the interventional headline.

raw 0 · after dedupe 0 · already on CT.gov 0 · kept 0 · parent 0 · uncertain 0 · dropped 0 · fetched 2026-07-30

Source notes: ictrp: Error: ICTRP public search unavailable (WHO portal is SPA-only; SOAP needs partnership). Tried: https://apps.who.int/tri

No secondary-registry studies passed dual-model relevance for this condition name (after dedupe).

Where to find support

Condition-specific patient organisations, when Orphanet lists them, are on the disease’s Orphanet page. We also link umbrella groups that support undiagnosed and ultra-rare families.

Orphanet entry for Susceptibility to respiratory infections associated with CD8alpha chain mutation — check Associations / patient organisations on that page.

India — NPRD

Last verified 2026-07-26

This ORPHAcode is not on our curated NPRD list (direct or Mondo-parent match). That does not decide clinical eligibility; families in India should ask a notified Centre of Excellence about current coverage.

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

("Susceptibility to respiratory infections associated with CD8alpha chain mutation" OR "Familial CD8 deficiency") OR (MESH:"CD8 Deficiency, Familial") OR ("CD8A" OR "CD8A syndrome" OR "CD8A-related")

Run this search on Europe PMC

MeSH descriptor terms unioned into the query: CD8 Deficiency, Familial

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Susceptibility to respiratory infections associated with CD8alpha chain mutation" OR "Familial CD8 deficiency" OR "CD8 Deficiency, Familial"

Study-type breakdown: 0 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.

Query health: suspect — strategies attempted: phrase, mesh; with hits: phrase

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus
  • Publication count (28355) is implausibly high for prevalence class "<1 / 1 000 000" — treat as possible over-matching, not a measure of research intensity

Ingested 2026-07-27T08:34:39.208Z