What makes this particularly interesting is that UW has a BSL-3 lab of its own on the 9th floor of McArdle, which I think is the spot where they've been working with that infamous resurrected super-lethal 1918 influenza strain.
See the Sunshine Project web site for the full story: Faulty Aerosol Chamber Infects Three
NIAID Encourages Use of Leaky Device in Biodefense
Chambers are Located in Nine US States, India, New Zealand, and Northern Ireland
(Austin, 18 April 2005) - A leaky aerosol chamber manufactured by the University of Wisconsin at Madison was responsible for three laboratory-acquired tuberculosis infections in a Seattle BSL-3 lab last year. The infections have not been made public until now. Nearly twenty Madison chambers exist across the US and in India, New Zealand, and Northern Ireland. While tuberculosis is not a biological weapons agent, the accident underscores the inherent dangers when working with dangerous disease agents...
... The report says that McMurray claimed that "the chamber was so safe that there was no need to even locate it in a BSL-3 environment", that it was "foolproof", and that "respirator use was not necessary" ... The airflow meter also leaked in tests of a Madison chamber located in Fort Collins, Colorado. Although the University of Wisconsin at Madison was contacted by the State of Washington in the course of the investigation, two Madison aerosol chamber customers contacted by the Sunshine Project say that they have not received any safety advisories.
Known Madison Aerosol Chambers and Locations*
... University of Wisconsin Madison, WI