Researchers have realized that the good effect in the treatment, the virus was not detected in blood, some T-cells and other cells appears to have a very low level in order to generate a new virus.

研究人员也意识到，在治疗效果很好、血液中检测不到病毒的情况下，一些辅助性T细胞和其他细胞似乎也在以极低的水平产生新的病毒。

youdao

"There was a lot about this new virus that we didn't know."

VOA: standard.2010.04.29

When Microsoft first learned of Scob, it advised users to disable a part of Internet Explorer because it couldn't stop the new virus.

FORBES: Criminal Outbreak

Microsoft learned of Scob last June, and at first it advised users to disable a part of Internet Explorer because it couldn't stop the new virus.

FORBES: Criminal Outbreak

And because it's a relatively new virus, most dogs don't have immunity to resist it.

WSJ: A New Breed of Flu Shot to Avoid Getting Sick as a Dog