harare zimbabwe opposition leader morgan tsvangirai suffer severe vomit party meet airlift johannesburg hospital senior party source say saturday tsvangirai due challenge president robert mugabe elections next year stable source say dismiss report media dangerously sick 65-year-old symptoms come suddenly meet opposition coalition movement democratic change mdc thursday even kadoma city around 160 km 100 miles southwest capital harare source say two zimbabwean political source confirm detail sudden illness airlift friday south africa mdc say official statement tsvangirai south africa routine medical procedure morgan tsvangirai ... stable condition contrary morbid media report critical battle life mdc statement say announcement come month vice president emmerson mnangagwa see favorite succeed 93-year-old mugabe rush south africa emergency medical care mnangagwa since return dismiss local media speculation poison tsvangirai say last year treat colon cancer party source say saturday sudden illness relate condition zimbabwe opposition chief tsvangirai suddenly ill airlift hospital source