NEW YORK, July 5 -- Anyone who has spent time in Carnegie Hill or Yorkville since late June and developed a fever, cough, or trouble breathing is now being told, in plain terms, to see a doctor immediately. Ten of their neighbors already have, and left with a diagnosis that starts with a mist of water vapor and can end in a hospital bed.

The New York City Health Department confirmed this week that it is investigating a community cluster of Legionnaires' disease centered on the Upper East Side, spanning the 10028 and 10128 zip codes. Two cases were confirmed on July 2. By July 3, the count had risen to ten, according to CBS New York, though the city's own case count as of its most recent public statement stood at two confirmed with additi...