3.3K views · 43 reactions | Most experts say that the best, safest way to reach herd immunity is through a vaccine, and a more controversial way is through natural infection. WebMD Chief Medical Officer Dr. John Whyte explains how many Americans would have to be infected with, and recover from, COVID-19 for the U.S. to reach it: | WebMD | Facebook

2.7K views · 16 reactions | Did you know about 50 million people in the U.S. have allergies each year? Learn more -- including 5 ways to soothe your symptoms: | WebMD | Facebook

10K views · 54 reactions | Macular degeneration is the most common cause of age-related vision loss. Here's a look at what happens in your eye when it occurs: | WebMD | Facebook