A Florida woman who contracted the Zika virus after visiting Disneyland in California in March may be getting a rare glimpse of the virus’ effects on humans in the United States, a new study has found.
The study, which was published Monday in the journal Science, examined more than 2,000 people who had been exposed to the virus in the state between March and June.
Researchers analyzed data from the Centers for Disease Control and Prevention’s National Center for Emerging and Zoonotic Infectious Diseases (NCEIVD) and the National Center on Communicable Diseases.
The researchers found that among those who had tested positive for Zika, the virus had caused about half of the cases to be milder than expected.
Some cases of mild-to-moderate Zika infection had been associated with lower blood pressure, lower blood sugar, more blood cells, and an increased number of circulating red blood cells (RBCs).
But the researchers cautioned that these associations are small, and that more research is needed to determine how the virus affects human health.
Zika is a mosquito-borne virus that causes fever and rash in the Americas.
Its first appearance in the U.S. was in 1947.
There have been nearly 8,800 confirmed cases of Zika in the continental U.K. since March and more than 8,400 in Brazil.
The CDC says there are more than 4,000 cases of the disease in the US.
In the United Kingdom, there are about 1,500 cases, with the vast majority occurring in England.
In Brazil, the disease has been linked to a large number of infections in the northeastern states of São Paulo and Goias, and in northeastern states in the north.
Zika has been associated primarily with Brazil, although it is found in a few countries including Mexico and Peru.
In February, the first cases of an infected person in the USA were reported in the Midwest state of Illinois.
A few months later, New York City and Boston were hit with more cases, bringing the total number of confirmed cases to more than 10,000.
The Centers for Diseases Control and Infectious Disease (CDC) and Health Canada have since announced plans to expand testing in the coming weeks.
The New York-based CDC has said it will allow some health workers to test their own bodies for the virus.
However, in the past, the CDC has not allowed those who test positive to get vaccinated, or have them tested by other health care providers.
The new study looked at two people, one of whom had been infected while in California and one of who was in Florida.
The Florida woman, who has not been identified, tested positive after returning from a trip to Disneyland.
She returned to Florida with her family, who were concerned about her condition, and tested negative.
The other person was a Florida man who visited Disneyland in June and had recently returned from a vacation in Costa Rica.
He tested positive, but was not tested.
“The person with the virus who came back from Costa Rica has not had any contact with anyone else in the area,” said Dr. Robert Pape, a professor at the University of California, Irvine and one the study’s authors.
“In fact, he’s not even been in contact with people who are infected with Zika, so we’re not aware of any other cases.”