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For years, many public health campaigns that aimed at changing habits have been failures. Earlier this decade, two researchers affiliated with Vanderbilt University examined more than 100 studies on the effectiveness of antidrug campaigns and found that, in some cases, viewers’ levels of drug abuse actually increased when commercials were shown, perhaps in part because the ads reminded them about that bag of weed in the sock drawer.
A few years later, another group examined the effectiveness of advertising condom use to prevent AIDS. In some cases, rates of unprotected sex actually went up — which some researchers suspected was because the commercials made people more frisky than cautious.
To teach hand washing, about seven years ago Dr. Curtis persuaded Procter & Gamble, Colgate-Palmolive and Unilever to join an initiative called the Global Public-Private Partnership for Handwashing With Soap. The group’s goal was to double the hand-washing rate in Ghana, a West African nation where almost every home contains a soap bar but only 4 percent of adults regularly lather up after using the toilet.