P3 biosafety laboratory refers to biosafety protection level 3 laboratory, P stands for Physical containment. the entire laboratory is completely sealed, the room is in a negative pressure state, so that the gas inside the laboratory will not leak to the outside and cause contamination.
Biosafety containment level 1 labs are generally used for microorganisms that are not pathogenic to healthy adults; level 2 is used for microorganisms that are moderately potentially hazardous to people and the environment; level 3 is used for pathogenic microorganisms or their toxins that can cause serious or even fatal diseases mainly through the respiratory route; level 4 is used for microorganisms that are highly hazardous to human beings, are transmitted by aerosol routes, are spread by unknown routes, have no effective vaccine, or are spread by unknown routes, and have no effective vaccine. Class IV applies to pathogenic microorganisms or their toxins that are highly dangerous to humans, spread through the aerosol route or have an unknown route of transmission, and for which there is no effective vaccine or treatment.