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WASHINGTON, Sept. 13 (Xinhua) -- U.S. health officials on Tuesday updated their progress on a months-long investigation into a "unique" Zika case in Utah, saying they are still unable to definitively identify how the person was infected.
But the officials hinted that contact with another Zika patient's body fluids, such as tears, conjunctival discharge, saliva, vomitus, urine, or stool, might be responsible for the Utah person's infection.
Zika is mainly spread by mosquitoes but can also be spread via sex. The "unique" Zika case, found in July, however, had no known risk factors for the virus, had not traveled to an area with Zika transmission and had no sexual contact with a person with Zika virus.
Health officials were only able to determine the individual helped provide care to an elderly male family contact, reportedly the person's father, who contracted the Zika virus abroad.
This other patient, who subsequently passed away, was infected with an unusually high amount of virus, approximately 100,000 times higher than an average infection.
As part of the investigation, U.S. health officials tested more than 200 people for the Zika virus, including family contacts of both cases, health care workers who cared for the deceased patient, and members of the general public who lived near both of the cases, and they have not revealed any additional Zika cases.
The officials also trapped and tested mosquitoes around the homes of both cases, and no mosquitoes known to carry the virus were found during the investigation.
It "remains unclear" how the "unique" case was infected, according to a report released Tuesday by the U.S. Centers for Disease Control and Prevention (CDC).
But the report noted that the person reported hugging and kissing the deceased patient, suggesting the possibility that the infection might be caused by contact with body fluids.
"Although it is not certain that these types of close contact were the source of transmission, family contacts should be aware that blood and body fluids of severely ill patients might be infectious," the officials wrote in the CDC's Morbidity and Mortality Weekly Report.
"This investigation will remain active, and we will continue working to learn more about Zika virus and how it may be spread," Dagmar Vitek, medical director from the Salt Lake County Health Department, said in a statement.
"People should continue to take the appropriate steps to prevent Zika virus infection -- especially pregnant women, and health care workers who are caring for severely ill patients with the disease," Vitek said.
More than 2,900 cases of Zika have been identified in the continental United States and Hawaii and the Utah patient is the only case that has an unknown mode of transmission.
