CIA report says most ‘Havana syndrome’ cases not caused by hostile foreign power

Some interim findings of a major CIA study conclude that most cases of the mysterious ailment known as “Havana syndrome” are unlikely to have been caused by Russia or another hostile foreign power. The report says a majority of the 1,000 reported cases can be explained by environmental causes, undiagnosed medical conditions, or stress. But the CIA is still investigating two dozen or so cases that remain unexplained. Carol Hills speaks with David Relman, a microbiologist at Stanford University.