this is be cool 8) how long does ivermectin stay in a dog's system The CDC has already manufactured this yearâs flu vaccine and distributed it to state and local health departments, but flu surveillance â one of the key tasks the CDC performs every year â was cut due to the shutdown. According to Barbara Reynolds, the CDCâs director of public affairs, 85 percent of the agencyâs flu division has been furloughed. The CDC has retained just 32 percent of its staff.