News at Seven-Thirty highlights: the administration has tracked down the 36 passengers set near the infected Mexican man on his flight; guests and staff at Metropark Hotel have been put under a seven-day quarantine; Education Bureau has ruled out suspending school classes at this stage; all flights between Mexico and Shanghai have been suspended; H1N1 virus is less ominous than first believed; South Korea confirmed the first case of H1N1 influenza in a woman; more than 40,000 visitors flocked to Cheung Chau; transport operators in HK have stepped up precautionary efforts to avoid an H1N1 outbreak; authorities in Europe and South America are busy clearing up the mess after May Day protests; a Portuguese warship seized explosives from suspected Somali pirates; the high-IQ society Mensa has recruited its youngest-ever member in Britain.