| influenza virus | 3.88 | The vaccine is derived from killed influenza viruses. | ||
| influenza vaccine | 1.32 | Elderly patients on the hormone showed an improved response to influenza vaccine. | ||
| influenza strain | 0.79 | No one knows why influenza strains move as they do. | ||
| influenza epidemic | 0.39 | Did you know that poor little Edna died in the influenza epidemic? | ||
| influenza outbreak | 0.39 | Public health officials warned of an influenza outbreak. | ||
| influenza pandemic | 0.33 | An influenza pandemic. | ||
| influenza infection | 0.26 | They linked it to an influenza B viral infection. | ||
| influenza program | 0.26 | Usually, influenza immunization programs have been completed by now. | ||
| influenza season | 0.26 | The peak influenza season is usually in January and February, but is notoriously unpredictable. |