KOHIMA, July 24 - Viral fever and water-borne diseases in Nagaland have claimed at least 274 lives in recent months, official sources said on Saturday. The state director of health services R Shaiza said the worst-affected areas were Mon, Mokokchung and Dimapur districts where the diseases were raging in an epidemic form. He said the diseases had claimed more than 150 people in Mon alone and 81 in Mokokchung. Forty-three people had died in Dimapur. Casualty figures from other parts of the state are yet to come in. However, unofficial figures put the toll at over 600.