Swine flu has hit the set of Sex.

We hear Sarah Jessica Parker and Co. are petrified that they will contract the potentially-fatal swine flu virus after a crew member on the New York City set of the upcoming Sex And The City sequel contracted the disease.

SATC stars — Sarah Jessica Parker, Cynthia Nixon, Kim Cattrall, and Kristin Davis — has implemented a policy demanding that hair and makeup staffers wear face masks when standing anywhere near them, according to a scoop from The National Enquirer’s Mike Walker.

A set tattle squeals: Sarah Jessica’s assistant distributed hand sanitizers to the entire cast and crew, instructing them to detoxify regularly – especially if they have to touch Boss Lady during scenes.