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Show Chicken Embryos Help Battle Dread Horse Disease , 4t k V 1 y i Good news to the nation's farmers came from the United States department of agriculture recently with the announcement that a cheap, extremely effective vaccine against almost always fatal sleeping sickn ess ; .n horses has been developed. The vaccine has been produced by use of chicken embryos in their shells. Left. The live 10- or 11-day old embryo of a chicken is innoculated with sleeping sickness virus. Center inset: When the chicken is about to break out of the egg the embryo is removed. Right: The vaccine, made from the embryo, em-bryo, is injected into the skin of the horse's neck, making him immune. The virus-filled embryo is extremely dangerous to handle and workers are equipped with rubber gloves. |