Teams of state health department and Pune-based National Institute of Virology have reached Kariyana town in the district to control the outbreak, they said.
Many people from Kariyana have migrated after the break out of the disease, according to sources.
"Six people died in Kariyana town in the district about a week back and their blood samples sent to Pune-based National Institute of Virology confirmed that they died of Congo fever, sources said.
"Neeru Gamara (25) was shifted to Rajkot civil hospital couple of days back with symptoms of Congo fever (vomiting and diarrhoea) died last night," Dr N K Patel, Resident Medical Officer at the Civil hospital said, adding six persons were still undergoing treatment.
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A medical officer A Singh working at Amreli civil hospital was also referred to here after having developed symptoms of Congo fever, he said.
Health officials from Gandhinagar and Pune have held meetings with local authorities to control the outbreak of the disease.