Hosted by Sandra Tsing Loh, The Loh Down on Science is a fun way to get your daily dose of science plus a dash of humor in less than two minutes.
Hosted by Sandra Tsing Loh
Airs Weekdays 2:31, 3:31 and 5:49 a.m.

A potential downside of living in a major metropolis

Can an excellent public transportation system make you . . . sick?

This is Sandra Tsing Loh with the Loh Down on Science.

It's long been known that infectious diseases tend to spread faster in certain cities.  But why?  Meet Benjamin Dalziel from Cornell University.  He simulated the spread of an airborne disease in 48 cities in Canada.  He considered the population size in and around each metro.  Also, how it changed during the daily rat race of some 7,000,000 commuters!

And?  As expected, bigger cities generally had bigger outbreaks.  The twist?  The best-organized metropoli were the worst off!  Especially those with a star-shaped design.  Such cities import workers by the burb-load, and pack ‘em into a relatively small city center.  With more germs in close daily contact?  Bugs body-hop like mad.  Then the newly infected go home, tainting communities in literally all directions.  These cities had three times more disease risk than they should, based on population size alone.

The findings should improve outbreak predictions.  With one small side effect:  The hub-city heebie-jeebies.  Yikes!


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The Loh Down on Science is produced by LDOS Media Lab, with 89.3 KPCC. And made possible by the generous support of the Gordon and Betty Moore Foundation.

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