The world is the planet Earth and all life upon it, including human civilization. In a philosophical context, the world is the whole of the physical Universe, or an ontological world. In a theological context, the world is the material or the profane sphere, as opposed to the celestial, spiritual, transcendent or sacred.
Should your child require the mumps vaccine post blood testing, you will need to consider getting the combined MMR vaccine done. The single measles and rubella vaccines are still readily available. Alternatively you could bypass the blood testing route and opt for the combined MMR vaccine.
Measles, mumps, and rubella (MMR) vaccine can protect children (and adults) from all three of these diseases. Thanks to successful vaccination programs these diseases are much less common in the U.S. than they used to be.