Prevalence of the different mutations associated with clarithromycin resistance in recent studies
| Country | No of strains tested | A2143G >(No (%)) | A2142G >(No (%)) | A2142C >(No (%)) | T2717C >(No (%)) | No detection (%) | Reference |
|---|---|---|---|---|---|---|---|
| *Two strains also harboured the A2142G mutation. | |||||||
| **These four strains had a T2182C mutation. | |||||||
| Germany (adults) | 16 | 9 (52.7) | 3 (16) | 4 (11) | Wolle13 | ||
| Italy | 12 | 7 (58.3) | 5 (41.6) | Fontana62 | |||
| Poland (children) | 23 | 16 (69.5) | 4 (17.3) | 2 (8.6) | 1 (4.3) | Dzierzanowska-Fangrat42 | |
| Spain (children) | 28 | 23 (82.1) | 2 (7.1) | 3 (10.7) | Alarcon63 | ||
| European multicentre study | 10 | 7 (70) | 2 (20) | 1 (10) | Mégraud19 | ||
| Brazil | 19 | 14 (73.6)* | 3 (18.7) | 2 (10.5) | Prazeres-Magalhaes27 | ||
| Hong Kong | 23 | 22 (95.6) | 1 (4.3) | Ling30 | |||
| Iran | 20 | 15 (75) | 1 (5) | 3 (15) | 1 (5) | Mohammadi42 | |
| Japan | 12 | 11 (92) | 1 (8) | Kato32 | |||
| Japan | 9 | 2 (22.2) | 6 (66.6) | 1 (11.1) | Umegaki64 | ||
| Korea | 12 | 8 (66.6) | 4 (33.3)** | Kim65 | |||
| Taiwan | 12 | 10 (83.3) | 1 (8.3) | 1 (8.3) | Yang66 | ||
| Total | 196 | 137 (69.8%) | 23 (11.7%) | 5 (2.6%) | 7 (3.6%) | 24 (12.2%) | |