They said Arumugam (32) of Pothiramangalam village in the district died yesterday after being admitted to the government hosptial at Thittakudi on July 21.
Six others were first admitted to hospital in Neyveli from where they were referred to the governent hospital in Chennai, the sources said.
They said health department officials are camping at thittakudi and conducting health camps in villages and conducting special awareness drives on prevention of dengue in the district.
Former health minister M R K Panneerselvam, an MLA representing kuringipadi constituency in cuddalore district, alleged that the state government had failed to control spread of dengue in Tamil Nadu.
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He claimed that during the visit to the government hospital in cuddalore, he had noticed over 150 persons being treated for dengue and fever.
On July 9 A woman and her two-day old baby had died of dengue at the government hospital in Coimbatore.
Tamil Nadu government had stated on July 22 that it was acting on "war-footing" to tackle the spread of dengue fever in some parts of the state.