Slide 001 Interventions for Tuberculosis Control and Elimination
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Around the turn of the 19th to the 20th century spitting was common among men in Europe and the United States (and possibly elsewhere). Campaings were made everywhere to re-educate the (male) population to stop the nasty habit and seemingly even burning it into bricks used on sidewalks as this one from San Francisco shows.

We now know (see the slide show on the epidemiology of tuberculosis on this site) that the sputum itself is not the real problem for transmission, but the droplets that evaporate to droplet nuclei and remain suspended in the air.

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Last update: September 29, 2010