| 1. | Congregation of cattle in stock yard or of horses in racetracks may provide the necessary environment for respiratory viruses .
将牛畜集中在牲畜围栏内或马匹集中在赛马场内会给呼吸道病毒传染提供必要的环境。 |
| 2. | How is virus transmitted to baby from the infected mother
女性怎样将病毒传染给婴儿？ |
| 3. | An hiv infection
人类免疫缺陷病毒传染 |
| 4. | An infected pregnant woman may transmit the virus to a foetus , leading to miscarriage and stillbirth
受感染孕妇可将病毒传染胎儿，导致流产和诞下死胎。 |
| 5. | A positive test result means that you are infected with hiv , and that you can spread it to others
当测试呈阳性反应，表示你已感染爱滋病病毒，并可将病毒传染他人。 |
| 6. | The newest estimate is that around forty million people are currently infected with the virus that causes aids
最新的估计是目前大约有4千万人被这种病毒传染导致引起爱滋病。 |
| 7. | But there are questions that remain , such as how the virus developed in chimps before it jumped to humans
但是依然存在一些问题，如在病毒传染给人以前它在猩猩群中是怎样发展的。 |
| 8. | Most victims display no signs of the illness during the early stage of infection but are able to transmit the virus to others
大部分患者在感染初期没有病征，但仍会把病毒传染他人。 |
| 9. | Latex and polyurethane condoms do not let std viruses pa through , so they offer good protection from stds
橡胶和聚氨酯避孕套都可以阻断性传播疾病病毒传染，所以可以有效地防止性病传播。 |
