Atiq Khan LUCKNOW: With at least two dozen districts of Uttar Pradesh reeling under the impact of rain-related diseases, the worst may not yet be over for them, despite the decline in floods and a respite from the prolonged spell of monsoon. Over 400 people have died of viral fever, malaria, diarrhoea, encephalitis, gastro-enteritis and measles. With runoff of water receding following a lull in rainfall, a fresh outbreak of water and vector-borne diseases has not been ruled out. According to health officials, there is a likelihood of a 25 per cent increase in the cases of viral fever and malaria, as also the dreaded encephalitis.