Dr. Jeffrey Kopin, Chief Medical Officer for Northwestern Medicine Catherine Gratz Griffin Lake Forest Hospital, joins John Williams to talk about measles cases being on the upswing, what we should know about Cyclospora outbreak today, and the benefits and risks of testosterone replacement.

https://serve.castfire.com/s:northwestern_medicine_KEiLn/audio/8560346/8-4-26_Dr_Jeffrey_Kopin_measles_cases_vaccination_Cyclospora_testosterone_therapy_2026-08-04-193446.128.mp3RFK Jr. says parents should vaccinate children against measlesRecent postsHealthOcasio-Cortez says she’s freezing her eggs as she decides her next political moves.cls-4{fill:#000;}Is it safe to eat your vegetables again?.cls-7{fill:#fff;fill-rule:evenodd}Doctor explains shift in hydrogen peroxide use.cls-3{fill:#fff;fill-rule:evenodd}Health officials urge caution for Gulf Coast beachgoers during surge of deadly bacterial infections.cls-4{fill:#000;}No Ebola cases found on quarantined river boat, Congo authorities say.cls-4{fill:#000;}Click for moreRecent PostsJohn WilliamsWhat do you think of the Sox Pope Hat giveaway?.cls-4{fill:#000;}John Williams Best of Speed Jokes 8-7-26.cls-7{fill:#fff;fill-rule:evenodd}WGN Radio’s Summer Playlists.cls-4{fill:#000;}Video and Photos: Chicago Ducky Derby 2026.cls-3{fill:#fff;fill-rule:evenodd}What do you do if a pollster asks about your vote?.cls-4{fill:#000;}Click for more