| Similarity | Rank | |
|---|---|---|
| vaccination | 0.806 | 13071 |
| cowpox | 0.798 | 85609 |
| rubella | 0.770 | 36198 |
| virus | 0.769 | 3744 |
| chlamydia | 0.763 | 41650 |
| tetanus | 0.758 | 19763 |
| immunization | 0.756 | 37647 |
| diphtheria | 0.753 | 24994 |
| azt | 0.742 | 28257 |
| immunise | 0.741 | 26499 |
| malaria | 0.739 | 12850 |
| penicillin | 0.737 | 15405 |
| hepatitis | 0.736 | 7631 |
| sulphonamide | 0.735 | 43862 |
| irradiation | 0.732 | 17771 |
| antibiotic | 0.731 | 7160 |
| measles | 0.731 | 15295 |
| injectable | 0.730 | 50700 |
| antitoxin | 0.730 | 90876 |
| infection | 0.730 | 2615 |
| tuberculosis | 0.729 | 11298 |
| hiv | 0.722 | 4107 |
| zidovudine | 0.719 | 36127 |
| polio | 0.717 | 19165 |
| immunisation | 0.716 | 21651 |