<i>Giardia duodenalis</i> in men who have sex with men: a systematic review
Bibliographic record
Abstract
Objective Giardia duodenalis causes enteritis and malabsorption and can be sexually transmissible in men who have sex with men (MSM). The aim of this study was to explore factors associated with MSM with G. duodenalis. Methods MEDLINE, Embase, Emcare, PubMed, Global Health and Web of Science were searched for manuscripts published up to February 2024. The primary author screened manuscript titles and abstracts; two authors independently reviewed full-text manuscripts for eligibility and risk of bias. We only included manuscripts that included MSM with G. duodenalis and explored at least one risk factor or association. Narrative data were synthesised following the population of a predetermined table. Results Twelve manuscripts were included in this review, including cross-sectional studies (n=7), case series (n=3), cohort study (n=1), case-control study (n=1), from the USA (n=8), the UK (n=1), Cuba (n=1), Spain (n=1) and Canada (n=1) published between 1977 and 2024 and included 191 MSM with G. duodenalis. This review highlighted demographic (living with HIV and living with HIV with a CD4 count <400 cells/mL), biological (coinfection with Neisseria gonorrhoeae, Chlamydia trachomatis, Escherichia coli, Entamoeba histolytica, non-pathogenic enteric parasites, intestinal spirochaetosis, Enterobius vermicularis, previous Treponema pallidum, N. gonorrhoeae, Shigella spp, hepatitis A, E. histolytica and G. duodenalis) and behavioural (lack of anal douching, oral-anal sex, oral sex, anal sex, group sex, use of sex toys, having more than one sexual partner per week, non-condom use, being part of a sexual network or having a sexual partner with G. duodenalis) factors associated with MSM with G. duodenalis. Conclusion This review has highlighted some demographic, behavioural and biological factors associated with MSM with G. duodenalis, which provide insight for public health control strategies and future research. PROSPERO registration number CRD42023477691.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.005 | 0.021 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.007 | 0.005 |
| Bibliometrics | 0.011 | 0.013 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".