A US military virologist says a recent cruise-related hantavirus outbreak could worsen and is “not over,” describing a chain of medical events that can occur when the disease advances. In comments published by the Daily Mail, Dr. Jay Hooper characterizes the illness as involving severe effects on blood vessels and the lungs, describing that “blood vessels leak” and that lungs can fill with fluid. He also suggests that the full set of complications leading to the most lethal outcomes requires unusually specific circumstances, saying it takes a “very, very rare” combination of factors for all of those events to occur. The report frames the warning as an assessment of how progression of the infection can affect patients over time, rather than a claim that conditions are necessarily worsening at a given moment. The article emphasizes clinical mechanisms and variability in disease severity, while not detailing new case counts or additional public health measures in the provided text.