US measles cases are undercounted, experts say, but real numbers are proving hard to pin down

During a Cabinet meeting last week, US Health and Human Services Secretary Robert F. Kennedy Jr. downplayed what is now the second-worst measles outbreak in the US since the disease was declared eliminated in 2000.

​ During a Cabinet meeting last week, US Health and Human Services Secretary Robert F. Kennedy Jr. downplayed what is now the second-worst measles outbreak in the US since the disease was declared eliminated in 2000. Read More Breaking News, Latest News and Videos | CNN