However, they are saying the man has no history of contact with sick fowl.
According to Supari, although the man, Iwan Siswara Rifei, has developed symptoms of bird flue, his two daughters, who also died, tested negative.
"There's strong suspicion that the father was infected with bird flu but we still have doubt about the test results. So we have sent the samples to Hong Kong for a second opinion," AFP quoted Supari as saying.
Supari told AFP that the results for all three family members could be announced in seven days.
She once again reiterated that the man and his family had no history of contact with sick fowl or foreigners during the past four months.
Meanwhile, World Health Organization spokeswoman Sari Setiogi has declared that the UN body is taking Rifei's death as a "suspected case" of H5N1 infection.
They are waiting for the results of the test.
The H5N1 type of bird flu chiefly spreads between animals. The virus has killed more than 50 people in Southeast Asia since 2003.
