Whooping cough cases are climbing. Here’s what to know

As cases of whooping cough rise, CNN wellness expert Dr. Leana Wen explains what causes the respiratory illness, how it spreads and what to do to protect yourself.

​ As cases of whooping cough rise, CNN wellness expert Dr. Leana Wen explains what causes the respiratory illness, how it spreads and what to do to protect yourself. Read More Breaking News, Latest News and Videos | CNN