| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| viruses outbreaks in history | 1.25 | 0.3 | 9963 | 51 | 28 |
| viruses | 1.11 | 0.1 | 6344 | 42 | 7 |
| outbreaks | 0.51 | 0.3 | 4687 | 84 | 9 |
| in | 0.57 | 0.8 | 4685 | 83 | 2 |
| history | 0.24 | 0.2 | 6423 | 16 | 7 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| viruses outbreaks in history | 0.25 | 0.1 | 1648 | 14 |
| what was the worst virus outbreak in history | 1.85 | 1 | 5237 | 75 |
| worst virus outbreak in history | 0.93 | 0.5 | 8845 | 75 |
| history of deadly virus outbreaks | 1.48 | 0.6 | 2660 | 82 |
| infectious outbreaks in history | 0.76 | 0.9 | 3422 | 41 |
| disease outbreaks in history | 0.17 | 0.1 | 1873 | 22 |
| infectious disease outbreaks in history | 0.09 | 0.1 | 5054 | 79 |
| history of viruses in the world | 0.45 | 0.5 | 8896 | 5 |
| major viruses in history | 0.68 | 0.3 | 4148 | 77 |
| major disease outbreaks in history | 0.94 | 0.9 | 3187 | 88 |
| timeline of virus outbreaks | 1 | 0.1 | 8085 | 5 |
| bacterial outbreaks in history | 1.5 | 0.5 | 8344 | 18 |
| the history of viruses | 0.54 | 0.4 | 6897 | 7 |
| what was the first virus in history | 0.11 | 0.5 | 6278 | 23 |
| what year did the virus start | 0.86 | 0.8 | 376 | 82 |
| when did the virus start | 0.97 | 0.5 | 226 | 58 |
| what year were viruses discovered | 1.92 | 0.5 | 6713 | 88 |
| when did viruses appear | 0.32 | 0.9 | 9131 | 97 |
| when did virus begin | 1.05 | 0.8 | 9753 | 94 |
