Here’s some of HealthDay’s top stories for Thursday, July 22:

Two-dose Pfizer vaccine gives great protection against Delta. A new study should reassure millions of Americans who’ve gotten the Pfizer vaccine: Two doses provide 88% protection against the COVID Delta variant. But protection fell sharply for those with only one dose. Read more

Biden says COVID vaccines could gain full approval soon. America’s three COVID-19 vaccines are currently being used under an FDA emergency authorization — leaving some people to question their safety and avoid immunization. But President Joe Biden said Wednesday that full approval may arrive soon. Read more

Drug makers reach $26 billion deal on opioid lawsuits. Between 1999 and 2019, over 500,000 U.S. lives were lost to opioid painkiller overdose, and many blame drug companies’ aggressive marketing for these tragedies. On Wednesday, four pharmaceutical giants reached a tentative settlement with states to settle opioid-linked lawsuits. Read more

Roller coaster rides shake up migraine research. Scientists tracking the brain activity of 40 roller coaster riders — half who had a history of migraines, half who didn’t — say key differences seen during the rides could help further research into the headaches. Read more

Want to avoid sleep apnea? Get off the sofa. The nighttime disturbances of sleep apnea plague millions, and new research finds a ‘couch potato’ lifestyle raises people’s risk. The link remained even when researchers accounted for weight. Read more