The CDC received a candidate vaccine virus for testing on Friday . CDC : Suitable vaccine will hopefully be sent to manufacturers by end of next week . In one vaccine method , viruses swap genes in egg . Another method uses reverse genetics instead of growing viruses in egg .
The CDC received a candidate vaccine virus for swine flu Friday . CDC : Suitable viruses will hopefully be sent to manufacturers by end of next week . In one vaccine method , viruses swap genes in egg . Another technique uses reverse genetics instead of growing viruses in eggs .