Zambian President Michael Sata was receiving medical treatment in Israel on Thursday, an Israeli official said without elaborating on his condition.The disclosure came a day after Zambian Vice President Guy Scott told parliament in Lusaka that Sata, 76, was in Israel on a "working holiday"."(Sata) is here on a private visit and he is receiving medical treatment," the Israeli official said. "He did not come to lie on a beach."Sata suffered a heart attack in 2008. Concerns about his health persisted and his opponents said he collapsed during a six-week election campaign in 2011 - an account he denied.