SAN FRANCISCO (AP) — Passengers aboard a cruise ship off the California coast have been instructed to stay in their cabins as they await test results that could show whether the coronavirus is spreading among the 3,500 people aboard. The results are expected Friday. On Thursday, a military helicopter crew lowered test kits onto the 951-foot (290-meter) Grand Princess by rope and later retrieved them for analysis at a lab as the vessel lay at sea off San Francisco, under orders to keep its distance from shore. The Princess cruise line says 45 people were selected for testing.