For much of the 20th century, medical progress seemed limitless.

Antibiotics revolutionized the care of infections. Vaccines turned deadly childhood diseases into distant memories. Americans lived longer, healthier lives than their parents.

Yet today, some of the greatest success stories in public health are unraveling.

Even as the world struggles to control a mysterious new virus known as COVID-19, U.S. health officials are refighting battles they thought they had won, such as halting measles outbreaks, reducing deaths from heart disease and protecting young people from tobacco. These hard-fought victories are at risk as parents avoid vaccinating children, obesity rates climb, and vaping spreads like wildfire among teens.

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