With six persons dying of seasonal flu in Humla, health workers have gone on high alert in the district. According to the District Public Health Office, the disease with symptoms similar to swine flu spreading, preparations are on to send blood and sputum samples to Kathmandu for testing. Two persons, who died are from Shreenagar and Chhipra VDCs and one person each of Kalika and Dandaphya VDCs died. The number of patients has risen rapidly in the past month.