Oral Health and Pneumonia in Adults With Intellectual and Developmental Disabilities: A Scoping Review.
Dirty mouths in adults with IDD hold pneumonia germs—screen oral health and arrange adapted dental care.
01Research in Context
What this study did
Byrne et al. (2026) searched every paper that linked dirty mouths to lung infections in adults with intellectual or developmental disabilities.
They did not run new tests. They mapped what is known and where the gaps are.
The goal: see if bad teeth could be a fixable pneumonia trigger for your clients.
What they found
Adults with IDD often carry pneumonia germs in their saliva.
The papers agree on that, but no one has run strong trials to prove dental care cuts lung risk.
The authors say: treat oral health as a red-flag vital sign until better data arrive.
How this fits with other research
Aznar et al. (2005) already gave us a 16-item checklist that predicts who will sit through dental work without sedation. Use it first, then clean teeth.
Li et al. (2015) warn that preschoolers with ASD and low IQ fight oral screens. Katrina moves the same worry to adults: if they can’t cooperate, germs stay.
Boudreau et al. (2015) and Naidoo et al. (2020) show sensory rooms and picture boards help kids accept care. The review hints adults need similar tricks, just not yet tested.
Together the papers form one story: spot the people who hate the dentist, adapt the visit, and you may stop pneumonia before it starts.
Why it matters
You already track swallowing and aspiration. Add a 30-second mouth check: red gums, plaque, or foul smell equals risk.
Pair the ICF quick screen with a sensory plan—dim lights, tell-show-do, or a simple board—so the client can finish the cleaning.
One clear note to the dentist or mobile hygienist could save a hospital trip later.
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02At a glance
03Original abstract
INTRODUCTION: Pneumonia is a leading cause of death for people with intellectual and developmental disabilities (IDD), who also have increased risk of oral disease. Given the known relationship between oral disease and pneumonia in similar populations, this review aims to explore what is known about the association between oral health and pneumonia among people with IDD. METHODS: This systematic scoping review was carried out in accordance with the Joanna Briggs Institute methods and the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews checklist (PRISMA-ScR). A systematic search of Medline (Ovid), Embase, Cochrane Trials, Cochrane Review, CINAHL and PubMed was conducted, guided by a registered protocol. The PCC framework informed the search and inclusion criteria. Titles and abstracts were independently screened by two reviewers, with full texts assessed for relevance to oral health and pneumonia in adults with IDD. RESULTS: Following a protocol and defined criteria, (2544) articles were abstract screened; a further (31) reached full-text review, with (7) included in this review. Study designs included cross-sectional studies (2), retrospective cohorts (2), prospective cohorts (2) and one RCT pilot (1). Six studies reported oral carriage of respiratory pathogens such as Streptococcus pneumoniae, Pseudomonas aeruginosa and Klebsiella pneumoniae. Two studies reported predictive relationships between oral pathogens and pneumonia, with increased odds of respiratory illness associated with positive PCR results for specific pathogens (OR 9.0, 95% confidence interval [CI] 2.3-38.8). Two studies identified poor oral health as a predictor of pneumonia, using validated tools such as the ROAG (OR 1.6, 95% CI 1.1-2.5). Mediating factors included enteral feeding, level of IDD, and history of oral disease. CONCLUSIONS: Research consistently finds carriage of potential respiratory pathogens in the oral microbiome of people with IDD. Despite this, there is a significant lack of research into the relationship between the oral microbiome, poor oral health, and pneumonia in this population, though the latter two are both prevalent and consequential. There is an urgent need for further research exploring the role that oral health and the oral microbiome play in pneumonia among people with IDD.
Journal of intellectual disability research : JIDR, 2026 · doi:10.1111/jir.70013