When health professionals are looking to control and prevent an infectious disease, they consult the chain of infection to see where the cycle of infection can be broken. The cycle consists of the microorganism, the reservoir/source, the port of exit, the means of transport, the port of entry, and the susceptible host. Starting with classifying the infection as bacterial, fungal, parasitic, or viral in origin is useful because some bacterium can be killed with antibiotics, some parasites with pesticides, etc. Identifying where the infection stems from is used to create interventions such as water/air sanitation efforts, and properly disposing of and sterilizing medical equipment. Efforts, such as proper handwashing, wearing protective clothing,