1) IN FOOD - e.g. food poisoning. You can get ill from eating food that's been contaminated with bacteria. It can be prevented by good hygiene and by making sure food is properly cooked before it's eaten.
2) IN WATER - e.g. cholera. You can get infected with cholera by drinking water that's been contaminated with sewage. It isn't a big problem in the developed world, but it kills many people in developing countries where sanitation is poor. Good sanitation can prevent cholera and other waterborne diseases.
3) BY AIRBORNE DROPLETS - e.g. influenza (flu). Flu and other viruses can be spread via the timy airborne droplets released when you cough or sneeze. Sneezing into a tissure, washing your hands properly and disinfecting contaminated surfaces can all help to prevent hte spread of flu.
4) THROUGH CONTACT - e.g. athlete's foot. The fungus which causes athlete's foot can be spread by people walking in bare feet on damp floors in places like showers and bathrooms. You can prevent it by washing your feet regularly and by not walking around bare foot. Disinfecting surfaces also helps.
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