Amendment paves way for power - sharing deal after violence disturbed election . President Robert Mugabe , opposition leader Morgan Tsvangirai signed agreement in parliament . More than 16,000 people have been infected , WHO said . Amendment allows prime minister post creation for opposition leader Tsvangirai . Parliament must approve amendment before government can put it into effect .
Amendment paves way for power - sharing deal after violence disturbed election . President Robert Mugabe , opposition leader Morgan Tsvangirai signed agreement in parliament . Amendment allows prime minister post creation for opposition leader Tsvangirai . Parliament must approve amendment before government can put it into effect .