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"The research shows that infection provides excellent protection against reinfection," Stephen Higgs, director of the Biosecurity Research Institute at Kansas State University, said in a university news release.
"This means people infected during this current epidemic will likely not be susceptible again. When a large proportion of the population is protected -- known as herd immunity -- the risk of future epidemics may be low," he explained.
Higgs and his colleagues also found that Zika virus is present in the blood at the very early stages of infection and is only briefly present in some tissues. But it remains in other tissues for a long time.
Blood and urine were clear of Zika virus within 10 days, the investigators found. But for at least three weeks after it was no longer present in blood, the virus was still detectable in saliva and semen, the findings showed.
Further research is needed to learn how Zika invades the nervous system and how long and extensively Zika virus remains in saliva and semen, Higgs said. While the virus is typically spread through the bite of the Aedes aegypti mosquito, it can also be sexually transmitted.
The study findings were published Oct. 13 in the journal Nature Medicine.
-- Robert Preidt
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