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.
Since the introduction of the mumps, measles and rubella (MMR) vaccine CRS is now very rare in the UK. Pregnant women can check with their GP if they are immune against rubella and then offered MMR if they are not immune, after their baby is born to give protection to the mother in the future.