| circulate in human | 0.72 |
| infect pig | 0.69 |
| infect bird | 0.63 |
| infect human | 0.62 |
| change possible | 0.59 |
| cause the flu | 0.55 |
| shown resistance | 0.52 |
| enter cell | 0.50 |
| circulate in swine | 0.45 |
| circulate among bird | 0.42 |
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| pandemic | 0.31 |
| sore throat | 0.16 |
| unpredictable | 0.36 |
| contagious | 0.33 |
| deadly | 0.32 |
| infectious | 0.27 |
| concentrated | 0.25 |
| promiscuous | 0.16 |
| enveloped rna viruses | 0.36 |
| rna viruses | 0.27 |
| isolated | 0.51 |
| spread to person | 0.44 |
| involved in hemagglutin… | 0.40 |
| involved in virus attac… | 0.40 |
| involved in envelope fu… | 0.40 |
| divided into subtype | 0.40 |
| spread | 0.38 |
| divided into three types | 0.33 |
| propagated in embryonat… | 0.29 |
| inactivated by normal t… | 0.25 |
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