A serious neurological disorder has been linked to Zika virus. The mosquito-borne virus causes an autoimmune disorder that attacks the brain's myelin similar to multiple sclerosis, according to the new study.
"Though our study is small, it may provide evidence that in this case the virus has different effects on the brain than those identified in current studies," said study author Maria Lucia Brito Ferreira, MD, with Restoration Hospital in Recife, Brazil. "Much more research will need to be done to explore whether there is a causal link between Zika and these brain problems."
Zika Fever
Zika virus is transmitted to humans by infected mosquitoes which causes mild fever with maculopapular rash. No treatment or vaccine is currently available.
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‘People stricken by the Zika virus developed an autoimmune disorder known as acute disseminated encephalomyelitis (ADEM), which attacks the myelin sheaths that surround the nerve fibers of the brain and spinal cord.’
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For the study, researchers followed people who came to the hospital in Recife from December 2014 to June 2015 with symptoms compatible with arboviruses, the family of viruses that includes Zika, dengue, and chikungunya. Six people then developed neurologic symptoms that were consistent with autoimmune disorders and underwent exams and blood tests. The authors saw 151 cases with neurological manifestations during a period of December 2014 to December 2015.
All of the people came to the hospital with fever followed by a rash. Some also had severe itching, muscle and joint pain and red eyes. The neurologic symptoms started right away for some people and up to 15 days later for others.
![Swift Action Needed To Minimize Economic Impact Of Zika Outbreak: World Bank]( "Swift Action Needed To Minimize Economic Impact Of Zika Outbreak: World Bank")
The impact of the mosquito-borne Zika virus will be modest, if $3.5 billion, or 0.06 percentage points is taken off of gross domestic output (GDP) for the affected region this year.
Of the six people who had neurologic problems, two of the people developed acute disseminated encephalomyelitis (ADEM), an attack of swelling of the brain and spinal cord that attacks the myelin, which is the coating around nerve fibers. In both cases, brain scans showed signs of damage to the brain's white matter. Unlike MS, acute disseminated encephalomyelitis usually consists of a single attack that most people recover from within six months. In some cases, the disease can reoccur. Four of the people developed Guillain-Barré syndrome (GBS), a syndrome that involves myelin of the peripheral nervous system and has a previously reported association with the Zika virus.
When they were discharged from the hospital, five of the six people still had problems with motor functioning. One person had vision problems, and one had problems with memory and thinking skills.
Tests showed that the participants all had Zika virus. Tests for dengue and chikungunya were negative.
"This doesn't mean that all people infected with Zika will experience these brain problems. Of those who have nervous system problems, most do not have brain symptoms," said Ferreira. "However, our study may shed light on possible lingering effects the virus may be associated with in the brain."
"At present, it does not seem that ADEM cases are occurring at a similarly high incidence of the GBS cases, but these findings from Brazil suggest that clinicians should be vigilant for the possible occurrence of ADEM and other immune-mediated illnesses of the central nervous system," said James Sejvar, MD, with the Centers for Disease Control and Prevention in Atlanta and a member of the American Academy of Neurology. "Of course, the remaining question is 'why'-why does Zika virus appear to have this strong association with GBS and potentially other immune/inflammatory diseases of the nervous system? Hopefully, ongoing investigations of Zika virus and immune-mediated neurologic disease will shed additional light on this important question."
The study will be presented at the American Academy of Neurology's 68th Annual Meeting in Vancouver, Canada, April 15 to 21, 2016.
Source: Eurekalert
Swift Action Needed To Minimize Economic Impact Of Zika Outbreak: World Bank
The impact of the mosquito-borne Zika virus will be modest, if $3.5 billion, or 0.06 percentage points is taken off of gross domestic output (GDP) for the affected region this year.
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Of the six people who had neurologic problems, two of the people developed acute disseminated encephalomyelitis (ADEM), an attack of swelling of the brain and spinal cord that attacks the myelin, which is the coating around nerve fibers. In both cases, brain scans showed signs of damage to the brain's white matter. Unlike MS, acute disseminated encephalomyelitis usually consists of a single attack that most people recover from within six months. In some cases, the disease can reoccur. Four of the people developed Guillain-Barré syndrome (GBS), a syndrome that involves myelin of the peripheral nervous system and has a previously reported association with the Zika virus.
When they were discharged from the hospital, five of the six people still had problems with motor functioning. One person had vision problems, and one had problems with memory and thinking skills.
Tests showed that the participants all had Zika virus. Tests for dengue and chikungunya were negative.
"This doesn't mean that all people infected with Zika will experience these brain problems. Of those who have nervous system problems, most do not have brain symptoms," said Ferreira. "However, our study may shed light on possible lingering effects the virus may be associated with in the brain."
"At present, it does not seem that ADEM cases are occurring at a similarly high incidence of the GBS cases, but these findings from Brazil suggest that clinicians should be vigilant for the possible occurrence of ADEM and other immune-mediated illnesses of the central nervous system," said James Sejvar, MD, with the Centers for Disease Control and Prevention in Atlanta and a member of the American Academy of Neurology. "Of course, the remaining question is 'why'-why does Zika virus appear to have this strong association with GBS and potentially other immune/inflammatory diseases of the nervous system? Hopefully, ongoing investigations of Zika virus and immune-mediated neurologic disease will shed additional light on this important question."
The study will be presented at the American Academy of Neurology's 68th Annual Meeting in Vancouver, Canada, April 15 to 21, 2016.
Source: Eurekalert
International Health Experts to Visit Brazil to Check Rise in Zika Virus
Experts from the US Centers for Disease Control are already in Brazil and officials from the Food and Drug Administration and the National Institutes of Health, are due to arrive.
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 Mexico Reports Six Confirmed Cases Of Zika Virus In Pregnant WomenThe women are among 80 total Zika cases in Mexico, with more than half of them reported in the southern impoverished state of Chiapas. | Advertisement
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