| lower part of the lungs | 0.27 |
| mouth | 0.16 |
| affect lung | 0.49 |
| affect child | 0.48 |
| affect people | 0.44 |
| affect the elderly | 0.39 |
| respond to treatment | 0.38 |
| inflame the air sacs | 0.37 |
| involve lung | 0.37 |
| resolve over time | 0.35 |
| occur | 0.33 |
| affect the young | 0.29 |
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| fever | 0.43 |
| chill | 0.40 |
| fluid | 0.34 |
| chest pain | 0.34 |
| confusion | 0.31 |
| breathing difficulties | 0.29 |
| conjunctivitis | 0.28 |
| cough | 0.26 |
| fatigue | 0.19 |
| weakness | 0.19 |
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| autism spectrum disorder | 0.19 |
| attention deficit hyper… | 0.19 |
| learning disability | 0.19 |
| different symptoms | 0.23 |
| bloody sputum | 0.21 |
| hospitalization | 0.47 |
| bed rest | 0.16 |
| bacterial | 0.56 |
| contagious | 0.53 |
| life-threatening | 0.53 |
| serious | 0.51 |
| treatable | 0.44 |
| fatal | 0.44 |
| severe | 0.43 |
| dangerous | 0.41 |
| more serious | 0.39 |
| mild | 0.38 |
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| respiratory failure | 0.32 |
| meningitis | 0.23 |
| sepsis | 0.19 |
| serious complications | 0.16 |
| about 4 million deaths | 0.16 |
| infection | 0.69 |
| a lung infection | 0.53 |
| inflammation | 0.42 |
| serious lung infection | 0.29 |
| complicated infection | 0.19 |
| acute, chronic disease | 0.16 |
| an inflammation of the … | 0.16 |
| caused by bacteria | 0.70 |
| caused by virus | 0.66 |
| treated with antibiotic | 0.63 |
| diagnosed | 0.58 |
| caused by fungus | 0.57 |
| treated | 0.54 |
| treated at home | 0.53 |
| prevented | 0.52 |
| caused by streptococcus… | 0.50 |
| caused by mycoplasma | 0.49 |
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