Around the world people are taking their own measures to stop the spread of the flu virus.In the US state of Pennsylvania, 22 students who had recently come back from Mexico were made to attend a separate graduation ceremony. Slippery Rock’s University President, Dr Robert Smith, said he did not want to take any chances: “When they landed on Tuesday the World Health Organisation said there was a seven to ten day incubation period, so they’ve got to make it through Tuesday.” The university was bombarded with calls from students and parents worried about being exposed to the virus. Those at the private ceremony seemed content with the arrangements appreciating the intimacy of the affair: “I wouldn’t have had that out in the big crowd, so it was great,” said one graduate. “It made it closer, it was nice. It was beautiful. They did the best of a bad situation” said another graduate’s mother. There were more than 600 students in the main hall. Their classmates in the smaller room are reported to be in good health.