Biosafety Level 1
The lowest safety level. These labs work with viruses that are minimal risk to humans.
Hand washing is required on entry and exit and potentially infectious material decontaminated with bleach before thrown away.
Must have a lock. Access limited. Lab does not need to be isolated from other buildings.
Used as teaching spaces.
Study microorganisms such as Staphylococcus which causes food poisoning.
Biosafety Level 2
These labs deal with pathogens that can be harmful to people and the environment such as Hepatitis, HIV and salmonella.
Working in Level 2 requires special training in handling pathogenic agents.
Extra safety and security precautions are taken in addition to those at Level 1
Biosafety Level 3
These labs contain material that can be lethal if inhaled. This includes SARS coronavirus, MERS, and yellow fever.
Significant extra precautions are taken with staff given specific immunisations when dealing with certain diseases.
Infectious material is examined in a biological safety cabinet.
Personnel must wear protective gowns that must be discarded or decontaminated after use.
Strict safety and handling procedures are in place. There must be double entrances to the building and they must contain self-closing doors to reduce risk of pathogen aerosols escaping.
Windows must be sealed. Air from must be filtered before it can be recirculated.
Biosafety Level 4
The highest level for biosafety precautions. Scientist work with highly dangerous diseases that have no vaccine or cure.
All material must be decontaminated.
Personnel must wear a positive pressure suit for protection. On leaving the lab this must pass through decontamination shower before they have a personal shower.
Entry is severely restricted to trained and authorised personnel. All entries are recorded.
Entrance must be via airlocks.