Biological safety levels are ranked from one to four, which are selected based on the virulence of pathogens. BSL-4 is the level of handling pathogens for which neither infection prophylaxes nor treatment options exist, such as Ebola, Lassa, Hanta viruses etc. What are the common methods of handling such hazardous substances in order to avoid self-exporsure to dreadful pathogens?

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