Most adults infected with the Zika virus have no symptoms, and those who have them have mild symptoms such as fever, rash, joint pain and swelling in the eyes. These symptoms can last several days and up to a week after the initial infection.
It has also been discovered that Zika infection causes neurological diseases in adults, such as Guillain-Barré syndrome (GBS). GBS is a rare disorder that can cause paralysis and sometimes death. In addition, Zika has been linked to infections of the central nervous system, including myelitis (inflammation of the spinal cord) and mening o encephalitis (inflammation of the brain and surrounding tissues).
Research shows that infection with Zika virus during pregnancy can cause birth defects in the developing fetus, but not all babies whose mothers had Zika during pregnancy are born with health problems. In 2015, infection with the Zika virus was linked to microscopically, a disease in which the brain and skull are smaller than normal. In studies conducted thereafter, additional complications have been observed including spontaneous abortions, births of dead children, intracranial calcification (calcium deposits in brain tissues), eye defects, hearing loss and growth problems. Further research is needed to understand the long-term results of Zika virus infection during pregnancy.