The Queensland government will offer Mount Isa teenagers mobile phone credit if they undergo sexual health checks.
Local health services have noted a nine-fold increase in syphilis cases since January last year, mostly affecting people under the age of 25.
Queensland Health announced it would offer $20 Telstra credit vouchers to people in Mount Isa who undergo a free, confidential screening for the disease before June 1.
Participants will also be put into a draw to win a mobile phone.
Chief health officer Jeannette Young said syphilis was a serious and potentially fatal illness.