IndexNo:799342:cbANmNDdurLY
| 投稿者 | Sydney |
|---|---|
| 投稿日時 | 2014/08/08 14:19:45 |
| Thanks funny site write a short essay on global warming There is no definitive test to prove when a virus has spread from human-to-human, but scientists consider matching viruses and eliminating other ways the virus might have spread to be convincing evidence. Scientists also tested 43 contacts of the two patients; none had H7N9. | |