Harare – Zimbabwe’s ailing opposition leader, Morgan Tsvangirai, who has returned to Harare after being rushed to South Africa for medical treatment, remains in "isolation" because doctors fear he could contract new infections.Sources close to the Movement for Democratic Change leader say that doctors have strictly instructed him to steer clear of public places and have limited contact with people, reported NewsDay. "He is at his Highlands home and has been contact with just a select few people, because he is under doctors' instructions to avoid the public as he recovers. The [MDC] president is at the moment fragile and prone to opportunistic infections," an unnamed source was quoted as saying.Tsvangirai was expected to make another trip to South Africa this weekend for further treatment before he resumes duties around Thursday next week.Tsvangirai announced last year that he had been diagnosed with colon cancer and that he had begun chemotherapy.Tsvangirai's spokesperson, Luke Tamborinyoka, has been quoted as saying the MDC leader was out of danger and would be back at work soon. "But he will not be working for some days to come as he fully recharges his batteries."The long-time opposition leader was airlifted to South Africa last month after he fell ill.