Zika virus was first discovered in Uganda in 1947. It causes an infection which is generally a non-severe viral illness with fever but it can cause severe disease by effects on the foetus in pregnant women. It is transmitted by mosquitoes which bite a human. Possible transmission via sex, specifically semen has been reported. The most common mosquito carrying the Zika virus (also carries the Dengue Fever virus) is only found in Northern Queensland and parts of central Queensland. Recent outbreaks have occurred in Central and South America especially in Brazil.