New Delhi:  A 23-year-old college student, admitted in a private hospital in Kerala's Ernakulam, has tested positive for the deadly Nipah virus, which killed 17 people in the state last year. The National Institute of Virology, which tested his blood samples, confirmed the presence of the virus, the government said today. Four more people, including two nurses, are down with fever and two of them had come in contact with the 23-year-old man. 311 people, among them 22 students, are under surveillance. "The test results have come from the National Institute of Virology, Pune, and it's positive for Nipah. The health authorities have made elaborate arrangements... NIV authorities will be handing over the medicines that have come from Australia," said Kerala Health Minister KK Shailaja, adding Union Health Minister Harsh Vardhan has assured of full support.