| flu vaccine | 71 |
| mmr vaccine | 29 |
| hpv vaccine | 26 |
| inactivated vaccine | 12 |
| dna vaccine | 7 |
| varicella vaccine | 5 |
| cancer vaccine | 4 |
| bcg vaccine | 3 |
| subunit vaccine | 1 |
| clinical trials | 0.52 |
| development | 0.50 |
| phase | 0.41 |
| the pipeline | 0.35 |
| protect child | 0.66 |
| produce antibody | 0.62 |
| provide protection | 0.60 |
| stimulate immune system | 0.60 |
| reduce the chance | 0.58 |
| protect against rubella | 0.58 |
| prevent infectious dise… | 0.57 |
| protect against pertuss… | 0.56 |
| protect against measle | 0.56 |
| create immunity | 0.55 |
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| merck | 0.51 |
| using monkey kidneys | 0.35 |
| countermeasure | 0.32 |
| booster shots | 0.47 |
| adjuvant | 0.46 |
| two doses | 0.46 |
| single dose | 0.43 |
| a series of shots | 0.42 |
| multiple doses | 0.41 |
| more than one dose | 0.40 |
| three doses | 0.33 |
| prescription | 0.31 |
| virus | 0.48 |
| bacteria | 0.42 |
| a variety of substances | 0.42 |
| peptide | 0.36 |
| weakened form of the vi… | 0.35 |
| a variety of animal cel… | 0.33 |
| dead virus | 0.33 |
| inactivated virus | 0.33 |
| aflu vaccine viruses | 0.33 |
| actual cancer cells | 0.28 |
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| tested | 0.63 |
| recommended for child | 0.62 |
| approved by the fda | 0.61 |
| recommended by the cdc | 0.61 |
| given by injection | 0.61 |
| introduced | 0.60 |
| made | 0.60 |
| recommended | 0.58 |
| used in the united stat… | 0.58 |
| tested for safety | 0.58 |
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| routine immunization of… | 0.35 |
| treatment | 0.33 |