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Biosafety in the TB Laboratory

Biosafety in the TB Laboratory

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Biosafety in the TB Laboratory

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  1. Biosafety in the TB Laboratory Presented by Peggy Coulter with (Patient Safety Monitoring in International Laboratories) Prepared for the ACTG Conference 24 June 2009

  2. Purpose of Training GCLP Standards: DAIDS supported clinical trials and studies involving human subjects must ensure compliance with federal regulations including procedures to protect the safety of all participants. Safety of laboratory employees must be a top priority for all lab facilities.

  3. Abbreviations • BMBL- Biosafety in Microbiological and Biomedical Laboratories (CDC) • LBM- Laboratory Biosafety Manual (WHO) • BSC- Biosafety Cabinet • LAI- Laboratory Associated Infection • TB- for Mycobacteriology testing

  4. Objectives: At the end of this training you will be able to: • Locate resources for biosafety guidelines; • Describe the elements of biosafety; • Identify standard and special practices in biosafety; • Select and use appropriate biosafety control measures; • Conduct an internal risk assessment and self inspection of the laboratory.

  5. Training Topics • Principles of Biosafety • Standard Microbiological Practices • Special Practices • Personal Protective Equipment • Containment Equipment • Laboratory Facilities • Safety Practices • Risk Assessment and Self Inspection

  6. Resources for Principles of Biosafety • Biosafety in Microbiological and Biomedical Laboratories (BMBL) from CDC at • Laboratory Biosafety Manual from W.H.O. at

  7. Introduction to Biosafety All laboratory facilities must follow “Standard or Basic Precautions”. Biosafety guidelines evolved from the microbiological and biomedical community to reduce laboratory associated infections (LIA’s) and to protect the public health and environment.

  8. Principles of Biosafety Two basic elements: • Containment • Risk Assessment

  9. Routes of transmission for LAI’s • Direct skin, eye, or mucosal membrane; • Parenteral inoculation by a contaminated sharp or needle; • Ingestion of liquid suspension; • Inhalation of infective aerosols.

  10. Risk Assessment • Pathogenicity of the microorganism • Prevalence of tuberculosis and rate of MDR • Types of testing performed or referred • Volume of tests • Personnel expertise and attitude • Facilities and equipment

  11. Levels of Biosafety, and Testing Levels

  12. Basic Microbiology Practices • Policies and access • Safety practices • Decontamination and Waste • Training

  13. Specimens

  14. Photo of washroom

  15. Handling of Specimens • Collection • Transportation • Receipt of incoming specimens • Opening packages

  16. Special Practices enhance worker safety, provide environmental protection and address the risk of handling agents requiring increasing levels of containment. Reminder: BSL-3 practices should be used whenever M.tuberculosis is handled even if the physical facilities are a BSL-2.

  17. All persons entering the laboratory must be advised of the potential hazards and meet specific entry/exit requirements. Animals and plants not associated with the work being performed must not be permitted in the laboratory.

  18. Laboratory personnel must be provided medical surveillance and offered appropriate immunizations for agents handled or potentially present in the laboratory.

  19. A laboratory-specific biosafety manual must be prepared, adopted as policy and made available and accessible to the laboratory staff. This is a written plan that defines safe lab practices, spill and emergency procedures

  20. The laboratory supervisor must ensure that the laboratory personnel demonstrate proficiency in standard and special microbiological practices before working in the mycobacteriology lab.

  21. Personal Protective Equipment (PPE) • Gowns, lab coats • Gloves • Respirators, masks, goggles, glasses • Shoe cover, boots

  22. Lab coats vs. Gowns

  23. Gloves Approved Type Correct Size Donning Proper Use Removal

  24. Shoes and Covers Open-toed footwear is not appropriate in the laboratory.

  25. Respirator program implemented by the laboratory's safety officer or person designated to perform this task and should include written procedures concerning how to: • select the appropriate respirator, • conduct fit-testing, and • train personnel on the use, fit checking, and storage of the respirator.

  26. Correct Type and Fit of Respirators Dust Surgical Mask Dust and Paint Fumes N-95

  27. PAPR

  28. Safety Equipment • Needle locking syringes • Centrifuge safety carriers • Microburners • Biosafety Cabinets (BSC)

  29. Centrifuge Safety

  30. Biosafety Cabinets (BSC) All procedures involving the manipulation of infectious materials must be conducted within a BSC, or other physical containment devices. No work with open vessels is conducted on the bench. When a procedure cannot be performed within a BSC, a combination of personal protective devices, such as centrifuge safety cup with sealed rotor, must be used.

  31. Use of BSC A BSC is the most important piece of containment equipment but only • if properly installed, • appropriate air velocity is maintained during use, • proper procedures are used.

  32. Use of biological safety cabinets

  33. Facilities • Ventilation • Temperature control • Sinks, eyewash, trashcans • Furniture and decontamination

  34. Plan of a culture laboratory

  35. Handling of contaminated laboratory supplies • Glassware • Sputum containers • Applicator sticks, paper, pipettes • Positive and negative slides

  36. Waste Handling Potentially infectious materials must be placed in a durable, leak proof container during collection, handling, processing, storage, or transport within a facility. No infected material should leave the laboratory except when it is properly packed for transport to another laboratory.

  37. Cleaning laboratory materials

  38. Disinfection and Sterilization A basic knowledge of disinfection and sterilization is crucial for biosafety in the laboratory. Laboratory equipment should be routinely decontaminated, as well as, after spills, splashes, or other potential contamination.

  39. Autoclaves

  40. Boiling and burning

  41. Safety Practices • Pipetting • Microscopy • Handwashing

  42. Handwashing

  43. Training Initial on hire Annual updates Staff should be observed in their biosafety practices

  44. Laboratory safety does not just happen. The best defense against a laboratory accident is a well-thought-out plan to neutralize its effects as quickly and effectively as possible. • recognize that accidents can and will occur • formulate a plan of action • discuss ways to minimize and prevent accidents

  45. Spill Procedures Laboratory accidents in the TB laboratory result in possible formation of aerosols. Spills involving infectious materials must be contained, decontaminated, and cleaned up by staff properly trained and equipped to work with infectious material.

  46. Emergency Procedures • Puncture wounds, cuts and abrasions • Ingestion of potentially infectious material • Potentially infectious aerosol release (outside a biological safety cabinet) • Broken containers and spilled infectious substances • Breakage of tubes containing potentially infectious material in centrifuges not having sealable buckets • Breakage of tubes inside sealable buckets (safety cups)

  47. Incidents that may result in exposure to infectious materials must be immediately evaluated and treated according to procedures described in the laboratory biosafety manual. All such incidents must be reported to the laboratory supervisor. Medical evaluation, surveillance, and treatment should be provided and appropriate records maintained.