Since the 1970s, the Centers for Disease Control and Prevention has operated the Vessel Sanitation Program (VSP), one of the most quietly consequential public health initiatives. Under its authority, any cruise ship carrying 13 or more passengers on an international itinerary that stops at a U.S. port is subject to twice-yearly, unannounced sanitation inspections. No heads-up. No grace period. Just a team of trained environmental health officers stepping onto the gangway, clipboards in hand, ready …
