| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| what caused the spanish flu outbreak | 0.48 | 0.1 | 9788 | 7 |
| causes of the spanish flu | 1.82 | 0.9 | 3570 | 42 |
| what started the spanish flu | 0.71 | 0.1 | 9202 | 7 |
| what causes spanish flu | 0.37 | 0.9 | 7587 | 4 |
| how did the spanish flu start | 0.95 | 0.3 | 3237 | 71 |
| cause of spanish flu | 1.16 | 0.6 | 1925 | 52 |
| how did the spanish flu begin | 0.01 | 0.5 | 505 | 66 |
| how did the spanish flu spread | 1.82 | 0.7 | 2208 | 83 |
| how the spanish flu started | 1.48 | 0.6 | 8287 | 20 |
| cause of spanish influenza | 0.38 | 0.5 | 9407 | 14 |
