The Study
Infectious seeds of valve calcification: Exploring the bacterial hypothesis in the pathogenesis of calcific aortic valve disease
This study looked at heart valves and found that sometimes bacteria were hiding in them, and when they were, the valves also had more signs of turning into bone. But it didn’t prove the bacteria made the bone — maybe something else, like bad cholesterol, caused both.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
Scientists checked heart valves from people who had surgery and found tiny bits of mouth bacteria in some calcified valves — and those valves also had more bone-like markers.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 544 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — even tiny amounts of mouth bacteria may trigger heart valves to turn into bone-like tissue, which can block blood flow and cause heart problems.
- 222.5% of calcified valves had bacterial DNA; 12.5% of non-calcified ones did.
- 3Calcium was 111 units higher in calcified valves (p=0.001).
- 4Osterix, a bone marker, was 123x higher in valves with bacterial DNA (p<0.0001).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
European Journal of Clinical Investigation
Year
2026
Authors
Antonella Forlino, Paola Giordani, C. Merla, S. Roda, R. Besio, Abeer Ahmed Qaed Ahmed, A. Kuka, I. Mileto, G. Petazzoni, M. Corbella, P. Cambieri, B. Fausto, A. De Silvestri, Totaro Pasquale, F. Amoroso, Pelenghi Stefano, Maraschi Federica, E. Arbustini, Viviana Vilardo, A. Smirnova, Raffaele Bruno, Seminari Elena
Related Content
Claims (6)
Patients with calcific aortic valve disease have more calcium buildup in their aortic valve leaflets than patients with aortic regurgitation, and this buildup is linked to high blood lipids and a congenital valve shape called bicuspid aortic valve.
Bacterial DNA from common low-risk bacteria is found more often in hardened aortic valve tissue than in non-hardened tissue, and its presence correlates with increased levels of a protein involved in bone formation.
Bacteria from inadequate dental hygiene are present in calcified heart valves and coronary arteries.
Cells taken from diseased heart valves form calcium deposits in a lab dish without any special triggers, while cells from healthy valves do not form these deposits under the same conditions.
Molecular testing detects traces of Staphylococcus and Streptococcus DNA in some aortic valves, but these bacteria are not found using standard tissue staining or culture methods.
In calcified aortic valves, osterix and alkaline phosphatase proteins are present at higher levels than in non-calcified valves. Osterix levels do not differ between valves with three leaflets and those with two leaflets. Alkaline phosphatase levels are higher in both calcified valves and bicuspid valves regardless of whether bacteria are present.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.