| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| how is the h1n1 influenza virus spread | 0.9 | 1 | 3259 | 76 |
| how does h1n1 influenza virus spread | 0.22 | 0.8 | 6384 | 89 |
| how is h1n1 spread | 0.18 | 0.9 | 4307 | 67 |
| how is the influenza virus spread | 1.33 | 0.5 | 2138 | 76 |
| how is h1n1 transmitted | 0.51 | 0.7 | 9247 | 100 |
| how is the influenza virus transmitted | 1.52 | 0.3 | 8635 | 57 |
| how is the flu virus spread | 1.71 | 1 | 9204 | 75 |
| how is influenza spread | 1.41 | 0.7 | 6752 | 96 |
| how is influenza spread among humans | 1.82 | 1 | 2940 | 26 |
| h1n1 influenza a virus | 1.49 | 0.4 | 4350 | 80 |
| how is h. influenzae transmitted | 1.63 | 0.2 | 6895 | 87 |
