The chickenpox vaccine is a shot that can protect nearly anyone who receives the vaccine from catching chickenpox. It's also called the varicella vaccine, because chickenpox is caused by the varicella-zoster virus. The vaccine is made from a live but weakened, or attenuated, virus. Viruses that have been attenuated are less virulent than viruses that are not.
The term whole grain refers to a variety of grains, including wheat, corn, rice, oats and rye, which are still in their natural form. Whole grains have a bran, germ and endosperm. To be considered a whole grain, the entire grain must still be intact and not just the endosperm, as is the case in refined grains.
A whole grain is an unrefined grain. Its bran and germ have not been removed through milling; all three parts of the grain remain -- the bran, the germ and the endosperm. Whole grains are a much better source of fiber and other important nutrients than refined grains are. Examples of whole grains include brown rice and popcorn. Oatmeal, too, is a whole grain. In fact, oats are one of the few well-known grains that almost never has its bran and germ eliminated during processing.