Here’s some of HealthDay’s top stories for Tuesday, July 6:

Even if vaccinated get ‘breakthrough’ COVID, it’s mild. A study of nearly 4,000 U.S. healthcare workers tracked from December through April found COVID infection is very rare in the fully vaccinated, and when it does happen cases at worst resembled a short-lived cold. Read more

Can you eat your way to fewer migraines? People with migraines who consumed a lot of the omega-3 fatty acids found in oily fish such as salmon or mackerel appear to reduce their headaches by up to 40%. Read more

Moderna, Pfizer COVID vaccines activate key immune system players. There’s been lots of talk about a drop-off in antibodies months after COVID vaccination, but new research suggests the shots activate other immune system actors that could provide long-term immunity. Read more

Pope Francis undergoes colon surgery. The Vatican announced that Pope Francis underwent a planned procedure on Sunday in which surgeons removed a section of his colon that had narrowed. Experts said it’s a common condition that can cause pain and trouble eating. Read more

Just 20 states reach Biden’s July 4 vaccination goal. In May, President Biden pledged to have 70% of Americans get at least one dose of a COVID-19 vaccine. But come Independence Day, that goal was not met by more than half of states. Read more