The best-case scenario: Sneeze into a tissue, throw it out, and immediately wash your hands. The second-best option (for when you're caught tissue-less): Sneeze into your upper sleeve, not your hands, and then still wash your hands.
It's common courtesy, people. The CDC has issued this same advice for more than a decade, so the ignorance excuse won't last much longer. Even Sesame Street weighed in on the matter back in 2009:
發表於 
見你一聽到打乞嗤。就已經咁不安。因為有時真係未必拎得切紙巾 
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