Readers respond to “I Grew Up Unvaccinated. I’m Lucky I Didn’t Get Sick,” a guest essay by Dr. Elisabeth Marnik. Also: A voice from Norway.

There are lots of follow-on risks once children start getting vaccine-preventable diseases.

Readers react to the Times investigation of the labor leader and civil rights icon. Also: A decision on vaccines; shielding lawyers.

Readers criticize President Trump’s proposed ballroom addition to the White House. Also: Trust the pediatrician; troops, not “boots on the ground.”

In Ohio after a toxic chemical accident, finding common ground in the country’s health wars.

Researchers have devised a new tool for discerning between naturally occurring viral outbreaks and those resulting from lab accidents.