Vital Information for Your Everyday Life
If zombies did start roaming the streets, CDC would conduct an investigation much like any other disease outbreak. CDC would provide technical assistance to cities, states, or international partners dealing with a zombie infestation. This assistance might include consultation, lab testing and analysis, patient management and care, tracking of contacts, and infection control (including isolation and quarantine). It's likely that an investigation of this scenario would seek to accomplish several goals: determine the cause of the illness, the source of the infection/virus/toxin, learn how it is transmitted and how readily it is spread, how to break the cycle of transmission and thus prevent further cases, and how patients can best be treated.
-- The CDC, on its role in a hypothetical zombie outbreak. As for what you can do, you should prepare for zombies like you would any other natural disaster: stock up on water, food, first aid, and wait it out in a safe place.
They do not, however, mention useful improvised weapons or heading out to your favorite pub.
(via The A.V. Club.)