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In this video, we are going to be talking about the different ways that hazardous substances can enter the body. There are four principal routes of entry to the body, inhalation where the substance is breathed in, adsorption where it enters through the skin, ingestion where it enters through the mouth and injection. 

Contaminants that can be inhaled include biological agents for example fungi or bacteria; chemicals, for example, solvents, during an activity such as sweeping, bagging; And spraying where the substance can become airborne and enter the lungs and the bloodstream and travel to other organs. 

Substances that come into contact with skin can enter through the pores or maybe an open wound. Tetanus, benzene are examples of substances that can enter in this way. Ingestion is where the substance enters the digestive system after being swallowed, this is not the most common and when it does occur it can often be as a result of poor personal hygiene for example not washing hands before eating. 

The final route is where Substances can enter the body by injection. This is a rare entry route if entry and can be caused by accidents involving hypodermic syringes. The best way to avoid this particular type of accident is through good infection control training and the correct disposal of clinical waste.