Most people are suffering from viral infections and lung (breath) related diseases. Because of the pollution in the world, the lungs are affected.
The best way to prevent them is to keep the environment clean. Breathe fresh air. Take vitamins and minerals. Take antibiotics and build resistance against them.
Viral fevers and infections are very common. There are virus spreading through water, air, interactions of people and other means.
The ways to prevent is to take vitamins and minerals. Take antibiotics. Keep yourself safe. Eat and drink purified water and food.