JOHANNESBURG: Over 500 people in South Africa have fallen ill from a gastrointestinal illness that causes stomach cramps and diarrhea, which authorities are blaming on poor water quality in two different cities in the country. Authorities this week issued a warning to communities east of the capital, Pretoria, to stop drinking water from their taps after 408 people including children fell ill and were treated at various health facilities. Like other cities in the country, the capital and its