Today is World Asthma DayAs part of National Asthma Awareness Month, the Centers for for Disease Control & Prevention (CDC) is holding a "Twitter chat" on the subject on Tuesday, May 15 from 1-2 p.m. EST.

The topic: "Asthma's Impact on the Nation."

Asthma is a chronic disease that affects the airways in the lungs. During the Twitter chat, the CDC's Dr. Chris Portier will talk about ways to control asthma and highlight the latest data from CDC’s National Asthma Control Program. Twitter users can join the conversation by using #CDCasthma in their messages.
Twitter chats are scheduled gatherings of people on Twitter to discuss anything that interests them, using a #hashtag to keep track of the conversation. There are chats for everything from blogging to art and architecture and health. A Twitter chat is similar to a chat room in that it’s a topic-driven conversation happening in real time; it just happens to take place on Twitter.

If you're not already using Twitter you can visit and click “Sign Up,” then “follow” Dr. Portier by searching for @CDC_DrCPortier or by clicking on