Many modern day liqueurs, like Campari and Pimm's, started off as 19th century medicinal tonics made to cure an array of ailments, including malaria. So if you're sipping a French aperitif or an absinth cocktail this holiday season, chances are you're also imbibing a bit of malaria history.

With publicity campaigns, radio jingles and pinups, the government helped eliminate the parasitic disease. The Centers for Disease Control and Prevention is still fighting malaria at home and abroad.

Global deaths from malaria have dropped sharply in the past decade, thanks in part to powerful drugs called artemisinins. But on the border between Thailand and Myanmar, doctors are starting to see cracks in artemisinin's armor. The medicine is working more slowly, and sometimes not at all.

Myanmar and other parts of Southeast Asia are awash with shoddy and phony malaria drugs. Some fakes are almost indistinguishable from authentic drugs. The counterfeits can be deadly for patients, but they also threaten to undermine major weapons against the disease.