ON the morning of Thursday, March 5, 15 health officers at the Tanjung Emas Port, Semarang, Central Java, sailed on a speedboat. As it closed in on the Norwegian cruise ship, Viking Sun, the speedboat slowed. Soon they were hurryingly boarding the cruise ship.

The health officers, armed with thermal guns and other health equipment, checked all 1,190 tourists and crew members on the cruise ship. During two hours of examination, none was found wit