Biological hazards are classified into 4 levels based on the risk they pose. The first level bio-hazards include viruses and bacteria that require little precaution to avoid their spread such as wearing gloves or wearing a mask. The decontamination procedures are similar to common precautions taken for most viruses such as washing hands with antibacterial soap. Then there are the level 2 bio-hazards which consist of viruses and bacteria that can cause mild diseases in humans such as hepatitis and influenza. These types of diseases can spread rapidly.
 

Next is the level 3 bio-hazard diseases which can lead to fatality in human beings. The diseases in such cases include West Nile virus, SARS, and variola virus among others. Treatment should be taken as soon as possible to reduce the number of fatalities.

The last level is level 4 which consist of viruses and bacteria that are the most fatal. As vaccines and treatments for the diseases induced by these viruses and bacteria are not available. Such type of diseases includes Lassa fever, Congo fever and dengue fever. Patients suffering from these diseases are kept in separated in air locked rooms. Isolation is important for stopping the spread of the diseases. The doors have multiple airlocks to stop the infection from spreading. The problem that is faced in containing these diseases is that even healthcare professionals can get infected and then pass on the infection to others.

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