| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| major viruses in history | 1.3 | 0.1 | 8330 | 67 | 24 |
| major | 1 | 0.8 | 3414 | 3 | 5 |
| viruses | 1.89 | 0.8 | 7454 | 3 | 7 |
| in | 0.51 | 0.4 | 5606 | 32 | 2 |
| history | 0.96 | 0.7 | 2206 | 25 | 7 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| major viruses in history | 1.05 | 1 | 4121 | 68 |
| major virus outbreaks in world history | 0.09 | 0.5 | 4921 | 87 |
| famous viruses in history | 0.54 | 0.2 | 1813 | 4 |
| biggest viruses in history | 0.85 | 1 | 1252 | 10 |
| history of viruses in the world | 0.85 | 0.5 | 3441 | 65 |
| past viruses in history | 0.47 | 0.2 | 1403 | 46 |
| deadly viruses in history | 1.2 | 0.1 | 2131 | 65 |
| most infectious virus in history | 1.82 | 0.9 | 1991 | 41 |
| viruses outbreaks in history | 1.7 | 1 | 8317 | 98 |
| viruses in historical outbreaks | 0.39 | 0.9 | 209 | 33 |
| worst viruses in history | 0.8 | 0.9 | 6449 | 31 |
| viruses in history of humanity | 0.64 | 0.1 | 9324 | 50 |
| famous computer viruses in history | 0.84 | 0.1 | 609 | 75 |
| what was the first virus in history | 1.98 | 0.4 | 659 | 28 |
| diseases and viruses through history | 0.06 | 0.8 | 3681 | 62 |
| viruses in historical evolution | 1.02 | 0.2 | 8965 | 14 |
| viruses in historical records | 1.59 | 0.7 | 9412 | 43 |
| viruses in historical epidemiology | 0.26 | 1 | 7693 | 95 |
| viruses in the 20th century | 1.58 | 0.5 | 1136 | 76 |
| viruses a natural history | 0.3 | 0.7 | 8169 | 93 |
