With six more people dying of encephalitis here since Saturday night, the vector-borne disease has claimed altogether 51 lives in northern West Bengal over the past 18 days, health officials said on Sunday. Six patients admitted to the North Bengal Medical College and Hospital (NBMCH) died between Saturday night and Sunday evening, the facility’s assistant Superintendent Rajiv Basu said. Superintendent Amarendranath Sarkar said 40 others are still undergoing treatment at NBMCH.A concerned West Bengal Government has announced a high alert in the seven North Bengal districts. Six others, admitted with high fever at the Jalpaiguri District Hospital, have perished during the past one week, said the district hospital’s superintendent Sushanta Roy.“They were admitted between July 13 and 20 with high fever and in serious condition. But they died soon after admission. Altogether 104 patients with high fever have been admitted during this period. “We don’t have the facility to test whether they have encephalitis. We have sent the blood samples of 11 of them to NBMCH. We are yet to get the reports,” said Roy. North Bengal Development Minister Gautam Deb visited the NBMCH here in Darjeeling district on Saturday and met the patients suffering from the Acute Encephalitis Syndrome. Health officials and Ministers will meet at the State Government’s branch secretariat Uttar Kanya in neighbouring Jalpaiguri district Monday to discuss the sudden outbreak of the disease.