It's also helpful to remember that there are many, many viruses that are extremely contagious too. and the flumist, which is a live virus, can spread the flu..Did you worry about the flu spreading to you? What about rhinovirus ( common cold)? Stomach virus? All those are extremely contagious as well. And they may cause just as much damage as measles, imo. The best thing to do is limit exposure, up your vitamins, healthy eating habits and be wary of your environment.