Zika virus transmission has been prominently reported from Miami, Florida. Australians have been issued severe warning against visiting the United States, especially Miami.

Recently, there have been around 25 cases of Zika infection in Miami. The Texas Department of State Health Services said on Monday that a local resident traveled to the place recently and tested positive to the virus. Where cases of Zika are increasing rapidly, Floridian authorities seem to have a very narrow approach in restricting boundaries of areas prone to Zika attack.

According to reports, only one-square-mile area towards the north of downtown Miami has been declared a Zika hot zone. The area only covers three streets and one highway. The authorities have requested pregnant women to avoid visiting the place. It is difficult to determine the parameters based on which the health officials from the Centers for Disease Control and Prevention have mentioned the area being prone to Zika virus attack. The public desires to get an answer to their doubts relating to the Zika boundaries being narrower.

“We’ve been asked, ‘Why not all of Miami?’” CDC Director Tom Frieden said. He provided a temporary answer to the concerns of the public. “There’s no evidence that there’s any Zika spreading anywhere else in Miami,” he said as quoted by The Washington Post.

USA Today reported that as there has been no evidence of Zika infection in Texas, the cause of the Texan citizen’s condition was assumed to be because of his trip to Florida. “This is the first Texas case to be linked to travel within the continental United States. The case will be classified as ‘travel-associated’ and is being investigated for more details,” the state health department of Texas said in a statement.

Zika virus is tough to diagnose because it’s symptoms do not properly indicate the disease. The pregnant women are more at risk of getting affected by it. The infection transfers from mothers to babies, leading them to suffer from microcephaly (hampered brain development) and arthrogryposis (joint issues).