| occur in 1957 | 0.68 |
| sweep the globe | 0.66 |
| spread to europe | 0.65 |
| occur in 1968 | 0.62 |
| come in wave | 0.60 |
| occur in 1918 | 0.56 |
| kill million | 0.51 |
| threaten to decimate hu… | 0.48 |
| begin in china | 0.44 |
| affect large proportion… | 0.41 |
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| serious illness | 0.28 |
| their servants | 0.30 |
| strain | 0.16 |
| severe | 0.69 |
| mild | 0.62 |
| imminent | 0.52 |
| inevitable | 0.51 |
| deadly | 0.47 |
| widespread | 0.45 |
| unpredictable | 0.37 |
| unusual | 0.35 |
| devastating | 0.31 |
| milder | 0.30 |
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| epidemic | 0.59 |
| an epidemic of infectio… | 0.45 |
| cooperative game | 0.34 |
| co-operative game | 0.32 |
| game | 0.28 |
| declared | 0.58 |
| caused by virus | 0.37 |
| used as adjective | 0.37 |
| spread | 0.31 |
| addressed by the parkin… | 0.30 |
| mitigated | 0.30 |
| equated with zika | 0.26 |
| equated with influenza | 0.26 |
| equated with hiv | 0.26 |
| sure to occur | 0.21 |
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