| appear in winter | 0.45 |
| occur | 0.38 |
| follow cold | 0.36 |
| begin with dry cough | 0.36 |
| develop throughout earl… | 0.35 |
| aggravate | 0.34 |
| prove to be the foundat… | 0.34 |
| come in two forms | 0.29 |
| rule the world | 0.25 |
| use expensive prescript… | 0.25 |
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| irritation | 0.33 |
| gastroentestinal | 0.32 |
| sore throat | 0.27 |
| high residual volume | 0.25 |
| wheezing | 0.24 |
| fatigue | 0.16 |
| effect | 0.34 |
| beginning | 0.25 |
| higher incidence | 0.19 |
| acute | 0.65 |
| chronic | 0.56 |
| contagious | 0.56 |
| viral | 0.53 |
| mild | 0.45 |
| versatile | 0.37 |
| severe | 0.34 |
| serious | 0.32 |
| boring | 0.28 |
| persistent | 0.19 |
| pneumonia | 0.39 |
| serious complications | 0.30 |
| painful sinusitis | 0.24 |
| breathlessness | 0.19 |
| emphysema | 0.16 |
| caused by virus | 0.61 |
| caused by bacteria | 0.59 |
| caused by smoking | 0.47 |
| caused by fungus | 0.46 |
| understood | 0.46 |
| caused | 0.43 |
| read | 0.41 |
| treated | 0.41 |
| caused by exposure | 0.41 |
| divided into two types | 0.34 |
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