| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| 50 000 year old virus | 0.31 | 0.3 | 778 | 40 |
| 50 000 year old zombie virus | 0.54 | 0.3 | 9564 | 5 |
| every 100 year virus | 0.21 | 0.8 | 2748 | 68 |
| oldest virus known to man | 1.98 | 0.4 | 8193 | 74 |
| viruses every 100 years | 1.92 | 0.7 | 7790 | 36 |
| viruses in the last 20 years | 1 | 0.5 | 8815 | 49 |
| oldest virus in the world | 1.93 | 0.9 | 5502 | 65 |
| what is the oldest virus | 0.62 | 0.6 | 1180 | 100 |
| huge virus in 1990s | 0.84 | 0.6 | 25 | 7 |
| virus 100 million viruses | 1.37 | 0.8 | 2151 | 47 |
| how old are viruses | 0.15 | 0.4 | 2797 | 85 |
| big viruses in 1800s | 0.24 | 1 | 4260 | 27 |
| deadly viruses over the years | 0.86 | 0.4 | 6161 | 38 |
| viruses over the years | 1.27 | 0.8 | 5540 | 78 |
| most deadly virus in history | 1.03 | 0.3 | 7095 | 22 |
| major viruses last 20 years | 0.44 | 0.9 | 9992 | 88 |
| virus in 90s news | 1.81 | 0.5 | 3144 | 73 |
| viruses in the 20th century | 1.95 | 0.9 | 8567 | 22 |
| most deadly virus in human history | 0.71 | 0.3 | 5769 | 25 |
| biggest viruses in history | 0.8 | 0.2 | 3859 | 60 |
| famous viruses in history | 0.11 | 1 | 7040 | 53 |
| what are some of the older viruses | 0.33 | 0.1 | 4668 | 30 |
| deadliest viruses in history | 1.15 | 0.6 | 758 | 69 |
