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Laboratories are classified based upon biosafety levels that range from biosafety 1 to biosafety 4. Biosafety level 4 is considered the most dangerous of the classifications. This classification is so dangerous because the pathogens studied in these labs are easily transmitted, have a high mortality rate, and have no known cure. An example of a pathogen studied in a biosafety level 4 laboratory would be the Ebola virus. While the Ebola virus is only spread through direct contact with the infected hosts fluids it can pose a huge threat if it is released. There are many safety precautions that are associated with a biosafety level 4 laboratory. One precaution is that everyone entering the lab must decontaminate themselves, this is also true for exiting the facility. When in the lab all personnel must wear a positive pressure suit, this ensures that even if the suit is cut or damage no airflow will be allowed into the suit. Any air entering the facility is filtered and any air leaving is double filtered. Biosafety level 4 laboratories must remain secure at all times or they could pose an incredible threat to the general public.