Rash on an arm due to<unk>  Most people who are infected have no or few symptoms. Otherwise the most common signs and symptoms of<unk>  are<unk> , rash, conjunctivitis (red eyes), muscle and joint pain, and headache, which are similar to signs and symptoms of dengue and chikungunya<unk> . The time from a mosquito bite to developing symptoms is not yet known, but is probably a few days to a week. The disease lasts for<unk> al days to a week and is usually mild enough that people do not have to go to a hospital. Due to being in the same family as dengue, there has been concern that it could cause similar bleeding disorders. However that has only been documented in one case, with blood seen in semen, also known as hematospermia. Guillain–Barré syndrome<unk>  virus infections have been strongly associated with Guillain–Barré syndrome (GBS), which is a rapid onset of muscle weakness caused by the immune system damaging the peripheral nervous system, and which can progress to paralysis. While both GBS and<unk>  infection can simultaneously occur in the same individual, it is difficult to definitively identify<unk>  virus as the cause of GBS. Though<unk>  virus has been shown to infect human Schwann cells.<unk> al countries affected by<unk>  outbreaks have reported increases in the rate of new cases of GBS. During the 2013–2014 outbreak in French Polynesia there were 42 reported cases of GBS over a 3-month period, compared to between 3 and 10 annually prior to the outbreak. Pregnancy Microcephaly The disease spreads from mother to child in the womb and can cause multiple problems, most notably microcephaly, in the baby. The full range of birth defects caused by infection during pregnancy is not known, but they appear to be common, with large scale abnormalities seen in up to 42% of live births. The most common observed associations have been abnormalities with brain and eye development such as microcephaly and chorioretinal scarring. Less commonly there have been systemic abnormalities such as hydrops fetalis, where there is abnormal accumulation of fluid in the fetus. These abnormalities can lead to intellectual problems, seizures, vision problems, hearing problems, problems feeding and slow development. Whether the stage of pregnancy at which the mother becomes infected affects the risk to the fetus is not well understood, nor is whether other risk factors affect outcomes. One group has estimated the risk of a baby developing microcephaly at about 1% when the mother is infected during the first trimester, with the risk of developing microcephaly becoming uncertain beyond the first trimester. Affected babies might appear normal but actually have brain abnormalities; infection in newborns could also lead to brain damage.
Zika fever
Chikungunya
Leptospirosis
Yellow fever
Dengue fever
Blackwater fever
Malaria
Trench fever