Ago, people did not find this piginfluenza would be spread between humans.
以前，人们并没有发现这种猪的流感会在人类之间传播。
2
Meanwhile, also had more than 20 people in the us to infect the piginfluenza virus.
与此同时，在美国也有20多人传染了猪流感病毒。
3
Sequencing of all eight gene segments found no evidence of genetic reassortment with human or piginfluenza viruses and no evidence of significant mutations.