News Tracking a pathogen Share this: Share on Facebook (Opens in new window) Facebook Share on Bluesky (Opens in new window) Bluesky Share on X (Opens in new window) X Print (Opens in new window) Print Email a link to a friend (Opens in new window) Email By Chicago TribunePUBLISHED: July 22, 2002 at 4:25 PM CDT | UPDATED: January 26, 2019 at 11:11 PM CSTGetting your Trinity Audio player ready... Tracking a pathogen Share this: Share on Facebook (Opens in new window) Facebook Share on Bluesky (Opens in new window) Bluesky Share on X (Opens in new window) X Print (Opens in new window) Print Email a link to a friend (Opens in new window) Email
