Zika Virus: Birth Defects and Neurological Dangers

The Zika virus, a flavivirus similar to those causing yellow fever and West Nile, is primarily transmitted through the bite of infected Aedes aegypti mosquitoes. It can also spread through sexual contact, blood transfusions, or needle transmission. While most infections are asymptomatic, symptoms like fever, rash, joint pain, and conjunctivitis can occur. A critical concern is Zika's impact on pregnancy, where infection can lead to microcephaly, a severe neurological disorder causing abnormally small heads in newborns, along with other developmental issues and an increased risk of miscarriage. Research indicates that nearly one in seven babies born to infected mothers may experience health problems. The virus was first discovered in Uganda's Zika forest in 1947 and isolated from mosquitoes in 1948. The first active human case was identified in 1964. Major outbreaks occurred on Yap Island in 2007 and French Polynesia in 2013-2014, with a notable increase in Guillain-Barré Syndrome cases suggesting a potential link. Brazil alerted the WHO to a Zika outbreak in March 2015, noting a surge in microcephaly cases by October 2015, prompting a national public health emergency. By February 2016, the WHO declared Zika a Public Health Emergency of International Concern due to rising neurological disorders. In April 2016, the CDC confirmed Zika causes microcephaly. While the WHO declared the outbreak no longer a public health emergency in November 2016, shifting focus to research, the CDC deactivated its emergency response in September 2017, though vigilance and study continue.