A CHOLERA OUTBREAK HAS KILLED AT LEAST 424 PEOPLE AND SICKENED 14,000 SINCE JANUARY IN SOUTHERN SUDAN, AND OFFICIALS ARE CONCERNED THE DISEASE COULD SPREAD TO OTHER COUNTRIES, THE WORLD HEALTH ORGANIZATION SAID FRIDAY. THE OUTBREAK HAS HIT SEVEN STATES IN SOUTHERN SUDAN, THE GENEVA-BASED U.N. ORGANIZATION SAID. NEIGHBORING COUNTRIES MUST STAY ON ALERT FOR THE DISEASE, THE AGENCY SAID. «ON THE KENYA SIDE AND ON THE UGANDA SIDE, THEY HAVE TO GET PREPARED TO DIAGNOSE SUSPECT CASES QUICKLY AND TO TREAT THEM QUICKLY BY REHYDRATION,» WHO'S CHOLERA CHIEF CLAIRE-LISE CHAIGNAT WAS QUOTED AS SAYING BY THE ASSOCIATED PRESS.