- Associated Press - Tuesday, August 2, 2016

SALT LAKE CITY (AP) - Utah health officials are still investigating how a man came down with Zika after caring for his infected father, but authorities said Tuesday they don’t believe the virus was spread by a mosquito.

Health workers have collected samples from more than 100 people who lived near the now-deceased father, and the results so far have been negative, indicating the unusual transmission wasn’t from the biting bugs, Utah Health Department spokesman Tom Hudachko said.

Officials visited homes in a 200-mile radius of where the father lived, and 123 people provided a blood sample to be tested. The majority of those samples have now been tested, Hudachko said.

While the type of tropical mosquito that mainly spreads the virus is not found in Salt Lake County, officials couldn’t immediately rule out the possibility that the bugs played a role.

While the father caught Zika abroad, health officials have been mystified by how the son got sick because the younger man didn’t travel to an affected area or have sexual contact with anyone who did.

The father, who was elderly and also suffered from another health condition, had an extremely high level of the virus in his blood, raising the possibility that it was transmitted through another bodily fluid in a way that hasn’t been yet identified by scientists.

The father died in late June, but the son has since recovered. The virus causes only a mild illness in most people. But during recent outbreaks in Latin America, scientists discovered that infection during pregnancy has led to severe brain-related birth defects.

The team investigating the Utah case expects to complete a report in September, Hudachko said.

Also Tuesday, the Centers for Disease Control and Prevention said it’s giving Utah another $200,000 to help rapidly gather information about brain-related birth defects. Utah was among 40 states and territories to get the additional assistance.

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