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1、BiosafetyPractices and Procedures,Presented by: Yang Y19 Jun 2012,Biosafety,Concept:Biological safety is to prevent occupational acquired infections as well as the release of pathogens into the environment.Biosafety is the prevention of large-scale loss of biological integrity, focusing both on ecol
2、ogy and human health.Biological & Biosecurity,Biosafety is related to several fields,In ecologyIn agricultureIn medicineIn chemistryIn exobiology,Precautionary principle,Biosafety require application of the precautionary principle in order to prevent the accidental release of potentially destructive
3、 biological material.,Biosafety level,A biosafety level is the level of the biocontainment precautions required to isolate dangerous biological agents in an enclosed facility. Biocontainment can be classified by the relative danger to the surrounding environment as biological safety levels (BSL).The
4、 levels of containment range from the lowest biosafety level 1 (BSL-1) to the highest at level 4 (BSL-4).,Biosafety level 1,This level is suitable for work involving well-characterized agents not known to consistently cause disease in healthy adult humans, and of minimal potential hazard to laborato
5、ry personnel and the environment.Such as canine hepatitis, non-pathogenic Escherichia coli, as well as some cell cultures and non-infectious bacteria.,Biosafety level 2,This level is similar to Biosafety Level 1 and is suitable for work involving agents of moderate potential hazard to personnel and
6、the environment.It includes various bacteria and viruses that cause only mild disease to humans, or are difficult to contract via aerosol in a lab setting. Such as C. difficile, most Chlamydiae, hepatitis A, B, and C, influenza A, Lyme disease, Salmonella, mumps, measles, HIV, scrapie, MRSA, and VRS
7、A.,Biosafety level 3,This level is applicable to clinical, diagnostic, teaching, research, or production facilities in which work is done with indigenous or exotic agents which may cause serious or potentially lethal disease after inhalation.It includes various bacteria, parasites and viruses that c
8、an cause severe to fatal disease in humans but for which treatments exist.Such as Mycobacterium tuberculosis, Bacillus anthracis, SARS coronavirus, Salmonella typhi, and yellow fever virus.,Biosafety level 4,This level is required for work with dangerous and exotic agents that pose a high individual
9、 risk of aerosol-transmitted laboratory infections, agents which cause severe to fatal disease in humans for which vaccines or other treatments are not available.Such as Ebola virus, Lassa fever,BSL-2 differs from BSL-1 in that,Laboratory personnel have specific training in handling pathogenic;Acces
10、s to the laboratory is limited when work is being conducted;Extreme precautions are taken with contaminated sharp items; Certain procedures in which infectious aerosols or splashes may be created are conducted in biological safety cabinets or other physical containment equipment.,Aerosol,An aerosol
11、is a colloid suspension of fine solid particles or liquid droplets in a gas.Such as smog and smoke,Aerosols in the Laboratory, bottles and flasks; blenders and vortexers; centrifuges; homogenizers; needles and syringes; pipettes; pressurized vessels; rubber stoppers; shakers; sonicators; vacuum and
12、aspirating equipment,Biosafety cabinet,A biosafety cabinet (BSC) is an enclosed, ventilated laboratory workspace for safely working with materials contaminated with pathogens requiring a defined biosafety level.,Purposes of Biosafety cabinet,The primary purpose of a BSC is to serve as the primary me
13、ans to protect the laboratory worker and the surrounding environment from pathogens. All exhaust air is HEPA-filtered as it exits the biosafety cabinet, removing harmful bacteria and viruses.,Classes of Biosafety cabinet,Class II, Type A1, A2, B1, B2 Cabinet,Air flow in Class II, Type A2,Correct Use
14、 of Biosafety Cabinets,Start UpTurn off ultraviolet light (if so equipped) as soon as you enter the room. Turn on all blowers and BSC illumination lights. Allow five minutes of operation to purge system; check flow alarm system audio and visual alarm function (if so equipped).Decontaminate readily a
15、ccessible interior surfaces and items with a disinfectant (appropriate for the agents or suspected agents present) before loading and wait at least 10 minutes prior to start of work.,Correct Use of Biosafety Cabinets,During Use Load supplies prior to work. Do not overload cabinet. Separate clean and
16、 dirty side.Work in center of work area. Do not block front or rear grills.Minimize disruption of airflow (turbulence).Clean up spill promptly.Discard waste within the cabinet.,Correct Use of Biosafety Cabinets,Shut DownDecontaminate and remove all items from interior work area. Decontaminate readil
17、y accessible interior surfaces with a disinfectant appropriate for the agents or suspected agents present.Turn on ultraviolet light (if so equipped). Allow five minutes of operation to purge system. Then wait at least 10 minutes.Never turn off BSC blower.,DO NOT open flamesFire hazardCan damage HEPA
18、 filterInterferes with proper air flowOpen flames react with disinfectants (flammables),Correct Use of Biosafety Cabinets Open Flames,Avoid use of glass blender jars, unless covered with polypropylene jarPlace disinfectant-moistened towel over the top of the blender during useBefore opening the blen
19、der jar, allow the unit to rest at least 1 minute for aerosols to settle and then open in a BSCDecontaminate promptly after use,Safe Use of Blenders,Use careful pipetting practicesAvoid drops onto hard surfacesWipe up spills promptly with appropriate disinfectantFor ejection of liquid from micropipe
20、tteNo blowoutNo pressure ejectionUse wall contactUse capped tubes when mixing, blending, or vortexingPour liquids carefullyAvoid bubbles,Minimizing Aerosols,Careful Pipetting Techniques,Never blow out last drop in pipetteUse pipetting aids with filtersNever mix by suction and expulsion (mix by sonic
21、ation)Discharge liquid down side of container, using tip-to-wall contactDeliver as as possible to contentsWork over plastic-backed absorbent matting (ensure it doesnt slide forward or backward blocking air grill),Use Extreme Care with Sharps,Use sharps if only absolutely required as part of a proces
22、sPercutaneous exposure riskEmploy safe work practicesUtilize safe sharp devicesAerosol exposure riskUse biosafety cabinet for removal of air from needleUse mechanical methods for needle removalNever bend, recap or manipulate sharps by handKeep hands away from needle,Biological Waste Disposal,Puncture-proof, leak-proof, sealable receptaclesAvoid over-fillingDispose properly,To be continued,
