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 . Those companies will fine-tune the virus for their own production methods , and produce small `` pilot lots '' of vaccine that can be tested in animals , and possibly people , for effectiveness and safety . Another method uses reverse genetics instead of growing viruses in egg .
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 .