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Combination of Chikungunya and Zika Virus Linked to Stroke

by Samhita Vitta on September 19, 2020 at 12:41 PM
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Combination of Chikungunya and Zika Virus Linked to Stroke

Combination of two deadly mosquito-borne viruses may trigger a stroke, according to a new research study.

The study is published in the The Lancet Neurology.

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Researchers from the University of Liverpool and Brazilian collaborators have been investigating the connection between infection with viruses such as Zika and chikungunya and neurological disease.

Zika virus and chikungunya virus mostly circulate in the tropics. They result in large outbreaks of fever and rashes in places like India and Brazil.
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Zika virus is widely known to cause brain damage in babies following infection in pregnancy. However, the new study shows that zika virus can also cause nervous system disorders in adults.

The study shows that zika virus can cause Guillain-Barre syndrome. Guillain-Barre syndrome is a condition in which the nerves in the legs and arms are damaged.

Chikungunya was more likely to cause inflammation and swelling in the brain (encephalitis) and spinal cord (myelitis).

The study found that stroke was caused only when the patients were infected with both the viruses together. Either of the viruses alone would not result in a stroke.

Stroke commonly occurs when one of the arteries supplying blood to the brain becomes blocked.

It is known that after some types of viral infections like varicella zoster virus, which causes chickenpox and shingles, and HIV, the risk of getting stroke increases.

Stroke is also being recognized increasingly as a complication of COVID-19.

The study consisted of 1410 patients who were screened, and 201 patients were recruited over two years in Brazil.

Antibody testing and comprehensive PCR was carried out to test the viruses in the laboratories.

148 patients out of the admitted 201 patients with suspected neurological disease had confirmed viral infection on laboratory testing. One-third of these 148 patients had an infection with more than one virus.

The median age of patients was 48, and just over half the patients were female.

Only around 10% of patients had fully recovered at discharge. Many patients had issues such as weakness, seizures, and problems in brain function.

Two-thirds of the stroke patients, who were aged 67 on average, had an infection with more than one virus.

Most people who had a stroke also had other risk factors, like hypertension, indicating that stroke following Zika and chikungunya viral infection may most often be seen in those who are already high risk.

"Although the world's attention is currently focused on COVID-19, other viruses that recently emerged, such as Zika and chikungunya, are continuing to circulate and cause problems. We need to understand more about why some viruses trigger stroke so that we can try and prevent this happening in the future," said senior author Professor Tom Solomon.



Source: Medindia
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