Shu Yuelong, director of the Chinese National Influenza Middle, told the state Xinhua News Company that the mutated H1N1 flu virus within China was in ‘isolated’ cases in the mainland, is not resistant to medicines and can be avoided by vaccines. The report did not provide any more details, such as for example when the cases were detected and if they were linked to any deaths. Calls to the National Influenza Middle rang unanswered as the Health Ministry did not immediately respond to a faxed set of questions. China has imposed a few of the toughest methods in the global world to prevent the spread of H1N1 flu. But many wonder whether or not they are working along with the government claims, CBS News correspondent Celia Hatton reviews.Have you ever tried to hold your breath? At first, you feel good. After a short time, though, you have to take a deep breath. That’s because when we breathe, our lungs ingest oxygen from the air. We are in need of oxygen to live. We also need a way to get the oxygen from the lung area to all of those other body. Blood flows like a river through every right section of the body. The blood bears the oxygen, but the oxygen requires something to hang on to.