Characteristics of the primary studies and prevalence ratios of high serum Legionella antibody (IgG) level assessed using extracted data
| Study | Country | Dental healthcare working categories | Occupationally unexposed individuals | Proportion seropositives (dental healthcare workers) | Proportion seropositives (occupationally unexposed individuals) | Prevalence ratio (95% CI) |
| Fotos et al 3 | USA | Dentists, clinical-level students, assistants | General population | 20.0% (54/270) | 10.4% (7/67) | 1.91 (0.91 to 4.01) |
| Oppenheim et al 65 | UK | Dentists, clinical-level students | Last-year medical students, young doctors | 5.9% (9/152) | 1.4% (1/70) | 4.15 (0.54 to 32.08) |
| Reinthaler et al 18 | Austria | Dentists, assistants, technicians | White-collar workers, non-dental students | 33.6% (36/107) | 4.7% (5/106) | 7.13 (2.91 to 17.47) |
| Luck et al 66 | Germany | Dentists, assistants | General population | 6.9% (15/218) | 5.5% (16/293) | 1.26 (0.64 to 2.49) |
| Pankhurst et al 32* | UK | Dentists | Blood donors | 0.4% (1/246) | 2.4% (12/500) | 0.17 (0.02 to 1.29) |
| Vogt et al 33 | USA | Dentists | Clinically unexposed volunteers | 8.6% (93/1076) | 9.1% (2/22) | 0.95 (0.25 to 3.61) |
| Borella et al 8 subset a | Italy (Turin) | Dentists, clinical-level students | White-collar workers | 26.9% (32/119) | 32.9% (23/70) | 0.82 (0.52 to 1.28) |
| Borella et al 8 subset b | Italy (Bari) | Dental healthcare workers | White-collar workers | 31.8% (14/44) | 9.1% (4/44) | 3.50 (1.25 to 9.80) |
*Legionella pneumophila antibodies.