’Seattle Mama Doc’ answers your vaccine questions
11 April 2017 Last updated at 00:08 BST
Dr Wendy Sue Swanson, a pediatrician and a mom, is the chief of digital innovation
at Seattle Children’s hospital and writer of the popular “Seattle Mama Doc” blog.

“You could save your buddies’ lives,” he said, “at the expense of your own ass.” Perez said these answers are unacceptable.
She was thrilled by his shift in fortune — “when I saw him, it was like being reborn,” she said — but was not expecting a fairy tale.
The fight was swift — “it went by like a flash,” the other man said.
What are you thinking?”
“It’s nothing, pretty gypsy,” he said.