U.S. researcher contracts Zika during experiment – media
Lara, who is less then 3-months old and was born with microcephaly, is examined by a neurologist at the Pedro I hospital in Campina Grande, Paraiba state, Brazil. On Wednesday, April 13, 2016, the U.S. Centers for Disease Control and Prevention said there's enough evidence now to declare that the Zika virus during the mother's pregnancy causes the microcephaly birth defect and other brain abnormalities. (AP Photo/Felipe Dana, File)
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A United States laboratory researcher was back at work after contracting the Zika virus by pricking herself with a needle during an experiment last month, broadcaster ABC News said on Thursday.

There is no vaccine or treatment for Zika, which is a close cousin of diseases such as dengue and chikungunya, and causes mild fever, rash and red eyes. An estimated 80 percent of those infected have no symptoms.

The unidentified researcher at the University of Pittsburgh pricked herself on May 23 and showed symptoms on June 1, returning to work five days later when she no longer had a fever, ABC News said, citing a statement from the school.

School officials were not immediately available for comment.

The incident was the fourth confirmed case of the Zika virus in Allegheny County, its health department said, without giving details of the accident.

“Despite this rare incident, there is still no current risk of contracting Zika from mosquitos in Allegheny County,” department director Karen Hacker said in a statement.

U.S. health officials have concluded that Zika infections in pregnant women can cause microcephaly, a birth defect marked by small head size that can lead to severe developmental problems in babies.

The World Health Organization has said there is strong scientific consensus that Zika can also cause Guillain-Barre, a rare neurological syndrome that causes temporary paralysis in adults.

The connection between Zika and microcephaly first came to light last fall in Brazil, which has now confirmed more than 1,400 cases of microcephaly that it considers to be related to Zika infections in the mothers.

To reduce the chance of virus transmission, the Pittsburgh researcher is using insect repellent to avoid mosquito bites, besides wearing garments with long sleeves and trousers, ABC News added.

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