A potentially paralyzing illness in children spreads across the country and the U.S. experiences the worst flu season in decades.

The CDC estimates 80,000 people died of the flu and its complications last season, the deadliest toll in 40 years. The virus also killed a record number of children.

The CDC also confirmed more than 150 cases of Acute Flaccid Myelitis – or AFM. The rare, potentially-paralyzing illness affects mostly children and it's still unclear exactly what causes AFM.

Just before thanksgiving, the CDC also issued a warning to throw away all romaine lettuce. The alert followed an e-coli outbreak that made dozens of people sick.

Those are some of the highlights in the health world from 2018. CBS News Chief Medical Correspondent Dr. Jon LaPook has a look back at all of the year's top medical stories.