HYDERABAD: Two patients who are suffering from Zika Virus reported in Thaliand, following which an improved surveillance at the airports has been ordered by the Health Ministry. The passengers who report fever, cough or cold are targeted by the ground unit of Rajiv Gandhi International Airport. A senior member of the ground unit said that they take down the details of the passenger and refer them to a higher centre for screening, adding that they arrive in the city and might get in touch with others and that the screening mechanism was not set up at the airport.