Different Biosafety levels of laboratory.ppt
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The document discusses the history and key aspects of biological safety levels. It began with the first Biological Safety Conference in 1955 organized by the U.S. Army to share knowledge on bio-safety issues. In 1964, the CDC specified four biosafety levels (BSL 1-4) to isolate dangerous biological agents. BSL1 is for well-characterized agents of minimal hazard. BSL2 requires more containment for agents of moderate hazard. BSL3 is for indigenous or exotic agents that may cause serious disease, while BSL4 is for dangerous and exotic agents that pose high risk of life-threatening disease. The document outlines the standard and special practices, safety equipment and facilities required at each level.
Different Biosafety levels of laboratory.ppt
- 2. History April 18, 1955 14 Representatives met at camp Detrick in Frederick, Maryland. Purpose: To share knowledge and experiences regarding bio-safety, chemical, radiological, and industrial safety issues that were common at the three principal laboratories of the U.S. Army 1st Biological Safety Conference. CDC (Center for Disease Control), 1964
- 3. History Center for Disease Control (CDC) specifies the biosafety levels for the U.S. BSL1-BSL4 The standard practices pertain to all levels Bio-safety Level- Level of the bio- containment precautions required to isolate dangerous biological agents in an enclosed facility.
- 5. BSL 1 BIOSAFETY 1 is suitable for work involving well- characterized agents not known to cause disease in healthy adult humans, and of minimal potential hazard to laboratory personnel and the environment. Lab is not necessarily separated from general traffic patterns in the building.
- 6. BSL 1 (cont) Work is generally conducted on open bench tops using standard microbiological practices. Special containment equipment or facility designs is not required nor generally used. Insect and rodent pest control program should be in effect Laboratory personnel have specific training in the procedures conducted in the laboratory and are supervised by a scientist with general training in microbiology.
- 7. BSL 1(cont) The following standard special practices, safety equipment, and facilities apply to agents assigned to all Biosafety levels. Standard Microbiological Practices Access to the laboratory are limited or restricted when experiments or work with specimens and cultures are in progress After handling viable materials and animals hands must be washed after removing gloves and before leaving the laboratory.
- 8. Standard Microbiological Practices Eating, drinking, smoking, handling contact lenses, and applying cosmetics are not permitted in the work areas where there is reasonable likelihood of exposure to potentially infectious materials. Persons who wear contact lenses in laboratories should also wear goggles or a face shield. Food is stored outside the work area in cabinets or refrigerators designated and used for this purpose only. Mouth pipetting is prohibited; mechanical pipetting devices are used.
- 9. Standard Microbiological Practices All procedures are performed carefully to minimize the creation of splashes or aerosols. Work surfaces are decontaminated at least once a day and after any spill of viable material. All cultures, stocks, and other regulated wastes are decontaminated before disposal by an approved decontamination method. Materials to be decontaminated outside of the immediate laboratory are to be placed in a durable, leak-proof container and closed for transport from the laboratory. Materials to be decontaminated at off-site from the laboratory are packaged in accordance with applicable local, state, and federal regulations, before removal from the facility.
- 10. Safety Equipment Special containment devices or equipment such as a biological safety cabinet are generally not required for manipulations of agents assigned to Biosafety Level 1. It is recommended that laboratory coats, gowns, or uniforms be worn to prevent contamination or soiling of street clothes. Gloves should be worn if the skin on the hands is broken or if a rash exists.
- 11. Safety Equipment Protective eyewear should be worn for anticipated splashes of microorganisms or other hazardous materials to the face.
- 12. Laboratory Facilities Each laboratory contains a sink for hand washing. The laboratory is designed so that it can be easily cleaned. Rugs in laboratories are not appropriate, and should not be used because proper decontamination following a spill extremely difficult to achieve. Bench tops are impervious to water and resistant to acids, alkalis, organic solvents, and moderate heat.
- 13. Laboratory Facilities (cont) Laboratory furniture is sturdy. Spaces between benches, cabinets, and equipment are accessible for cleaning. If the laboratory has windows that open, they are fitted with fly screens.
- 14. Biological Safety Level 2
- 15. BIOSAFETY CONTAINMENT LEVEL 2 Risk Group 2 infectious agents are pathogens that can cause human or animal disease but, under normal circumstances, are unlikely to be a serious hazard to laboratory workers, the community, livestock, or the environment Level 2 infections are not considered to be a serious hazard. They are a moderate individual risk and limited community risk.
- 16. Laboratory exposures rarely cause infection leading to serious disease; effective treatment and preventive measures are available and the risk of spread is limited. Examples of infectious agents in this risk level are E. coli, California encephalitis viruses, many influenza viruses, some fungi like ringworm; California encephalitis viruses; human herpes simplex viruses; many influenza viruses; Transmissible Gastro-enteritis of swine; Mouse Hepatitis Virus; and a few parasites.
- 17. PROCEDURES REQUIRED TO CONTAIN RISKGROUP 2 ORGANISMS The laboratory should be separated from all other activities. A biohazard sign should be present and visible. All the surfaces in the laboratory should be readily cleanable and impervious. An auto clave should be present. A certified HEPA filtered class 1 or 2 biological cabinet should be available for the manipulation of organisms. Gloves and a laboratory coat should be worn at all times in the laboratory.
- 18. Biological Safety Level 3
- 19. BIOSAFETY CONTAINMENT LEVEL 3 Risk Group 3 infectious agents are pathogens that usually cause serious human or animal disease, or which can result in serious economic consequences, but do not ordinarily spread by casual contact from one individual to another (high individual risk, low community risk), or that can be treated by antimicrobial or antiparasitic agents Risk Group 3 pathogens include bacteria such as anthrax, Q Fever, tuberculosis, and viruses such as hanta viruses, Human immunodeficiency viruses (HIV - all isolates), eastern and western equine encephalitis viruses.
- 20. PROCEDURES REQUIRED TO CONTAIN RISKGROUP 3 ORGANISMS Laboratory staff must be fully trained in the handling of pathogenic and other hazardous material, in the use of safety equipment, disposal techniques, handling of contaminated waste, and emergency response. Standard operating procedures must be pasted in visible spot. Equipment must include an autoclave and a certified HEPA filtered class II biological safety cabinet All activities involving infectious materials to be conducted in biological safety cabinets or other appropriate combinations of personal protective and physical containment devices.
- 21. Personal protective equipment should include head covers and dedicated footwear, gloves, appropriate respiratory protection Specialized design and construction of laboratories, with controlled access double door entry and body shower. Air pressure must be negative at all times, no recirculation, HEPA filtration must be used. PROCEDURES REQUIRED TO CONTAIN RISKGROUP 3 ORGANISMS
- 22. Biological Safety Level 4
- 23. BS4 is designed for use with: Highly toxic/infectious agents Agents that are at a very high risk for forming infectious aerosols Life threatening agents eg. Ebola, Marburg, Lassa BSL- 4……
- 24. Only those that work in the BSL-4 lab will be allowed entry Immuno-compromised individuals such as children and pregnant women are not allowed to enter A logbook must be signed each time one comes in or out of the lab with the date and time Special Practices in BS4
- 25. Special Practices in BS4 The doors must have a universal hazard label with…. • Description of the infectious agent (s) • Responsible director • PPE required such as respirators and any immunization requirements All lab personnel are trained specially for BSL- 4 by lab director
- 26. Lab personnel must be vaccinated for the agents… • Present in the lab • That have potential to be in the lab Baseline serum samples are collected and stored for serological surveillance • Makes sure the personnel have sufficient antibodies for the pathogens they are working with Biosafety manual is adopted for that lab Special Practices in BS4
- 27. Entering the lab • Personnel must remove personal clothing in an outer room and leave it • All clothing and PPE is provided and expected to be worn Exiting the lab • Personnel remove lab clothing in the inner room after taking a decontaminating shower The lab clothing is autoclaved then cleaned • They exit through the outer room where their personal clothes are Special Practices in BS4
- 28. Supplies/materials are brought into the lab by a double door autoclave that…. • is secured so that materials can be removed from the interior door • is decontaminated after each use Plastic is substituted for glass when possible • Eliminate sharps such as capillaries, scalpels, needles and syringes • Broken glass should be handled with a dust pan and broom • Non-disposable and disposable sharps collected in a hard container to be transported to an autoclave for decontamination; disposables are thrown out Special Practices in BS4
- 29. Any viable materials transferred from the class III Biological Safety Cabinet or the lab itself must be put in a primary container and then in a non- breakable secondary container • It is then removed by an airlock • Pressurizes the chamber so that minimal air is emitted when each door opens one at a time • Can also decontaminate the containers Special Practices in BS4
- 30. Lab equipment is decontaminated after use, after spills or before any repairs Any material not related to the project is not permitted in the laboratory A system is set up for emergencies such as exposure to infectious agents and also employee absenteeism on safety • Quarantine • Medical care for those with lab acquired illness • Records are kept for all accidents Special Practices in BS4
- 31. Safety Equipment (primary barriers) in BS4 Class III biological safety cabinets for handling infectious material Class II biological safety cabinet in conjunction with a positive pressure suit ventilated by a life support system BSC must be validated on a 12 month period The PPE required is a… • one-piece jumpsuit • gloves • closed toe shoes • All will be removed in the inner room after showering
- 32. Laboratory Facility (secondary barrier) in BS4 BSL-4 labs are housed in separate buildings or isolated within a building with lower BSL labs Outer and inner change rooms Walls, floors and ceilings have sealed internal shells • keep pests out • Liquid and heat stabile for decontaminating purposes Drains have chemical disinfectant traps attached to liquid waste decontamination system • All waste must be decontaminated including shower waste HEPA filters in vents for sterile air • Filter air exhaust from the class III and II biological safety cabinets and • From ventilated positive pressure suits worn in class II safety cabinets
- 33. Windows are break resistant A dunk tank, fumigation chamber or airlock is provided for safe passage of materials outside/inside lab that cannot be decontaminated in the autoclave A non-recirculation ventilation system is provided with directional inward airflow • Air flows from the outside of the lab to the inside but not vice versa Laboratory Facility (secondary barrier) in BS4