Pathological laboratories and doctors were being threatened in order to hush up the actual dengue situation in the state, Ghosh alleged in a press conference.
He said, "World Cup posters are carrying photos of the chief minister. But why is there no awareness campaign on dengue situation?"
The FIFA U-17 World Cup is being co-hosted by Kolkata.
"People are being given erroneous (pathological test) reports. The state government is trying to hush up the real picture of the disease," said Ghosh who is currently on a north Bengal tour.
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On the panchayat polls due next year, he said corruption would be the election plank of the party.
The funds being released by the Centre for the people are not reaching the intended beneficiaries, the senior BJP leader alleged.
The party is being readied for the panchayat election and state leaders are holding meetings with district level leaders, he said.
The party did not have faith on the state police manning booths during panchayat polls, he said.
To a question, Ghosh said paramilitary personnel were not properly utilised during elections in the state.