MIAMI: An elderly man who died of the Zika virus in Utah appears to have spread the infection to a caregiver, US health officials said Monday.
The case raises the prospect of a previously unknown path of transmission for a virus that is capable of causing birth defects and has traveled quickly though Latin America.
The caregiver has since recovered from the infection, which is primarily transmitted by mosquitoes but can also be passed on through sexual contact.
However, common modes of transmission have been ruled out in this case. The caregiver had not traveled to a Zika-affected area or had sex with an infected person, Staples said.
Mosquitoes carrying the Zika virus are not believed to present in Utah.
"We are learning something new about Zika virus every day," said Erin Staples, a medical epidemiologist with the US Centers for Disease Control and Prevention.
"This situation appears to be unique," she told reporters.
A statement issued by the CDC said the elderly victim had "uniquely high amounts of virus -- more than 100,000 times higher than seen in other samples of infected people -- in his blood."
The man, who was in his 70s and had an underlying health condition, passed away in late June, after traveling to a country where the mosquito-transmitted virus is active, the Salt Lake County Health Department said.
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