In an unprecedented move, the CDC announced it's changing the childhood immunization schedule – effective immediately. Rhiannon Ally has details on the federal health agency's new vaccine recommendations for the rotavirus, flu, RSV and more. https://abcnews.link/0HsigyC | ABC World News Tonight with David Muir

After holiday gatherings and travel, a record-breaking surge in flu cases is likely to get worse, health officials say. The CDC estimates there have been at least 11 million illnesses from flu so far this season. Stephanie Ramos has more. https://abcnews.link/Q6X6tLy | ABC World News Tonight with David Muir