Philadelphia Reflections

Philadelphia in 1976: Legionaire's Disease

The Yellow Fever

No other city in America is remembered for an epidemic; Philadelphia is remembered for two of them. The Yellow Fever epidemic, for one, that finished any Philadelphia's hopes for a re-run as the nation's capital. And Legionnaire's Disease, that ruined the 1976 bicentennial celebration. One is a virus disease spread by mosquitoes, the other a bacterial disease spread by water-cooled air conditioners. Neither epidemic was the worst in the world of its kind, neither disease is particularly characteristic of Philadelphia. Both of them particularly affected groups of people who were guests of the city at the time; French refugees from Haiti and attendees at an American Legion convention.

In 1976, dozens of conventions and national celebrations were scheduled to take place in Philadelphia as part of a hoped-for repeat of the hugely successful centennial of a century earlier. Suddenly, an epidemic of respiratory disease of unknown cause struck 231 people within a short time, and 34 of them died. Every known antibiotic was tried, mostly unsuccessfully, although erythromycin seemed to help somewhat. The victims were predominantly male, members of the American Legion of a certain age, somewhat inclined to drink excessively, and staying in the Bellevue Stratford Hotel, one of the last of the grand hotels. Within weeks, it was identified that a new bacterium was evidently the source of the disease, and it was named Legionella pneumophila. Pneumophila means "love of the lungs" just as Philadelphia means "city of brotherly love", but still that foreign name seemed to imply that someone was trying to hang it on us. Eventually, the epidemic went away, but so did all of those out-of-town visitors. The bicentennial was an entertainment flop and a financial disaster.

Since that time, we have learned a little. A blood test was devised, which detected signs of previous Legionella infection. One-third of the residents of Australia who were systematically tested were found to have evidence of previous Legionella infection. A far worse epidemic apparently occurred in the Netherlands, at the flower exhibition. Lots of smaller outbreaks in other cities were eventually recognized and reported. It becomes clear that Legionnaire's disease has been around for a very long time, but because the bacteria are "fastidious", growing poorly on the usual culture media, had been unrecognized. And, although the bacteria were fastidious, they were found in great abundance in the water-cooled air conditioning pipes of the Bellevue Stratford Hotel. Even though the air conditioning was promptly replaced, everybody avoided the hotel and it went bankrupt. When it reopened, 560 rooms had shrunk to 170, and it still struggled. Although there is little question that lots of other water-cooled air conditioning systems were quietly ripped out and replaced, all over the world, the image remains that it was the Bellevue, not its type of plumbing, that was a haunted house. There is even a website devoted to its hauntedness.

Originally published: Thursday, May 25, 2000; most-recently modified: Friday, May 31, 2019