Our bodies are made up of millions of very small cells, just as a building is made up of many stones or bricks. Some of these cells move about, eat away germs too stop them from harming us. We also make special substance in our bodies which attack germs are always present in our bodies.
For example- our tears contain some to protect our eyes, and our saliva contains to protect our mouths. Other substances are made inside our bodies when certain kinds of germ attack us. These substance are called antibodies and each protects us against only one kind of germ. As it happens, we cannot produce antibodies against every kind of germs.
Another way of protecting ourselves against sickness is to stop the germs from every reaching us. For this, we have to be hygienic in the way we live. We must make sure that our drinking water is clean. We should wash regularly so that we do not carry germs on our skin. Not all these illness is caused by germs, some kinds of sickness are also caused due to lack of right food. A balanced food helps us to build resistance and avoid sickness. Better living conditions help us to stop the spread of disease and let us stay healthy. This is the hope of the modern medicine. We want to prevent people from getting illness instead of waiting until they have it and then helping them. Our greatest enemies are ignorance and poverty, we fight these, we also fight diseases, like malaria.