The researchers identified people with symptoms of influenza in health clinics and confirmed that those people had influenza and not a different cause for their symptoms. If people agreed to participate, all members of the household were assigned at random to receive 1 of 3 infection prevention strategies. The first was education about healthy diet and lifestyle. In the second, people were given liquid hand soap and hand sanitizer and were instructed on how to use them. The third strategy was the same as the second, but it also included facemasks and instructions about how to use them.