Two Disease Outbreaks Prompt Review of U.S. Health Surveillance

A cruise ship that departed Argentina in November carried roughly 175 passengers from two dozen countries. One passenger died from hantavirus infection, and at least ten others became ill before the vessel reached Rotterdam. Health authorities tracked returning passengers after they disembarked.

Several individuals attended events in their home countries before entering quarantine, and dozens of Americans are now being monitored at U.S. facilities or at home.

The Andes strain identified on the ship spreads through direct contact or airborne particles. No vaccine or specific treatment exists, and the condition can progress to hantavirus cardiopulmonary syndrome with a fatality rate reaching 50 percent. A prior outbreak in Argentina showed that one infected person can transmit the virus to more than two others before isolation measures begin.

The incubation period can last up to two months, delaying symptom onset.

Ebola Declaration and U.S.

The circulating strain does not respond to an existing vaccine developed for an earlier variant. The Centers for Disease Control and Prevention received information about the hantavirus cases secondhand, and the agency did not activate its Emergency Operations Center until some U.S. passengers had already returned.

Staff reductions at the Centers for Disease Control and Prevention and cuts to foreign-aid programs have limited direct involvement in overseas disease monitoring. Officials have said the measures aim to restore public trust in health agencies.