| 1. | Viral strains causing pandemics in the last century
上一世纪导致大流行的病毒品种： |
| 2. | Is a highly infectious viral disease . it is caused by various types of influenza viral strains
流感是一种由病毒引致的疾病，传染性极高。 |
| 3. | It is caused by various types of influenza viral strains . three types of influenza viruses are recognized
流感由不同类型的病毒引起，已知的流感有三种类型： |
| 4. | Antigenic drifts minor changes of influenza viruses lead to the emergence of new viral strains every year
每年，流感病毒会出现抗原漂移轻微改变，并产生新病毒品种。 |
| 5. | Their destiny , like that of the “ attenuated ” viral strains grown in eggs , is to form part of a vaccine
这些疟蚊的作用便是用来作为疫苗的一部分，就像寄生于鸡蛋里面且毒素减弱的病毒株。 |
| 6. | The greater the difference is between the new influenza viral strain and the previous ones , the less immunity a population will have to it
新旧流感品种之间出现愈多差异，人口中对这种新病毒的免疫力就愈低。 |
| 7. | It is caused by various types of influenza viral strains . three types of influenza viruses are recognized : a , b and c . type a is more common
流感由不同类型的病毒引起，已知的流感有三种类型：甲型乙型及丙型，其中以甲型较为常见。 |
| 8. | Conclusion : sequential approach of alternate rounds of lamivudine or interferon may help patients to tolerate a prolonged schedule of therapy and protect them from emergence of viral strains
结论：交替使用轮拉米夫定、干扰素的序贯方法，有助病人忍受长期治疗并免于出现病毒株变异。 |
| 9. | Each year , the world health organization recommends the viral strain composition of the influenza vaccine for the coming season according to the prevalence of influenza viral strains in the community
每年，世均会根据社区中流感病毒品种的出现情况，为即将来临的流感高峰期使用的流感疫苗发出病毒成分建议。 |
| 10. | When two viral strains infect the same cell , their gene segments can reassort just like figures on a slot machine , forming new combinations and thus novel versions of the virus
当两种品系的病毒感染同一个细胞时，其中所带各段基因，就会像吃角子老虎上头的数字一样，重新配对而形成新的组合，也就是新品系的病毒。 |
