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...pictures of the world's most germ-ridden attractions on LIFE.com...
...outside, however, IVD sperm are not identical to normal sperm. "We think, for normal structure development, sperm needs the testes environment," says Nayernia. It takes 15 to 16 years in the testes before the primordial germ cells that morph into spermatogonia, or a primitive precursor of the germ cells, are able to mature into sperm cells that can successfully fertilize an egg. (See the top 10 medical breakthroughs...
...successfully - the ultimate measure of similarity between IVD sperm and normal sperm. (Nayernia is currently testing whether mouse eggs fertilized with IVD sperm can lead to a healthy animal.) If the researcher can generate human IVD sperm that look like normally developed sperm and can get the artificially created germ cells to fertilize an egg, then he can allow the resulting embryo to develop for 14 days - according to U.K. law, embryos created for research purposes must be destroyed at that point. "We would need to study that embryo before we provide any clinical applications," he says...
...interview with TIME, Dr. Miguel Angel Lezana, director of Mexico's National Epidemiological Center, rejects the criticism. "When you're dealing with a completely new germ, it tasks any health system's early-response capacity," says Lezana. "But it's difficult for me to imagine how a country could have acted more rapidly than Mexico did in this case...
...this point, you know all about swine flu. Perhaps you are keeping your distance from pork chops or vigorously washing your hands at this moment. From its place in relative health obscurity, falling somewhere between scabies and Tourette’s syndrome, swine flu has launched itself into germ infamy.The outbreak has affected thousands in Mexico and well over 100 and counting in the US. And now maybe the Dental School...