A viral infection of the respiratory system can be termed as measles or rubella. Mostly children suffer from it but measles can also be seen in adults. It can spread through contact with infected mucus and saliva and is highly contagious. If one coughs or sneezes the air can get infected and anyone in close proximity can get infected. You may be at a risk if you drink or share food in the same utensil used by the infected person. If you have a weak immunity you might suffer from measles which can also cause malnutrition and bad food habits.