Officials believe the individual picked up the virus locally, because he had not traveled to a Zika-affected area recently.
After a person is infected with the Zika virus through a mosquito bite the virus remains present in the blood and saliva for up to about two weeks, but remains in bodily fluids like breast milk for weeks and semen for months. Health officials also stressed that Zika can be sexually transmitted and precautions should be taken, especially if someone or their partner has traveled to an area where Zika is active.
Despite that, health officials have notified mosquito control and say they are conducting "mosquito reduction activities".
Saliva just doesn't provide a good environment for the Zika virus, the researchers said.
The Centers for Disease Control and Prevention now recommends that men diagnosed with Zika wait six months before having unprotected sex so that they do not infect their partner. This year, the first local case in the nation was confirmed in Texas in July.
Zika, linked to birth defects in women infected while pregnant, can be transmitted through mosquitoes or sexual contact. This is the second confirmed sexually transmitted Zika case in the US.
However, all three monkeys who had high-dose virus applied directly to their tonsils in the absence of saliva got infected (though the infection took slightly longer to develop than in monkeys infected under their skin), the researchers said. The majority of the cases were travel related and occurred in 2016.