Biological safety

Biological Safety and Infection Control

This section delves into the importance of biosafety, different biosafety levels, classification of infective microorganisms based on risk groups, biological risk assessment, and standard microbiological practices.

Importance of Biosafety

• Biosafety is crucial to prevent unintentional exposure to pathogens and toxins.

• Healthcare workers face risks from blood-borne pathogens like HIV, hepatitis B, and hepatitis C.

Biosafety Levels

• WHO and CDC assign laboratory facilities into biosafety levels for safe work with microbial agents:

• Basic (level one), basic (level two), containment (level three), maximum containment (level four).

• Designations are based on design features, construction, equipment practices, operational procedures, and risk assessments.

Classification of Infective Microorganisms

• Risk groups categorize microorganisms based on individual and community risks:

• Risk group 1: Nil to low individual/community risk; non-pathogenic agent.

• Risk group 2: Moderate individual risk; low community risk; pathogenic but manageable.

• Risk group 3: High individual risk; low community risk; pathogenic but treatable.

• Risk group 4: High individual/community risks; lethal pathogenic agent with limited treatment options.

Biological Risk Assessment Process

This part discusses the process of conducting a biological risk assessment in laboratories to ensure safety when working with infectious agents.

Conducting a Biological Risk Assessment

• The backbone of biosafety practice is conducting a risk assessment by evaluating hazards associated with infectious agents or materials.

• Steps involve identifying hazards, activities causing exposure, prioritizing risks based on likelihood and severity of consequences, implementing controls to minimize exposure risks.

Implementing Controls

• Controls include engineering controls, administrative/work practice controls, personal protective equipment to mitigate exposure risks.

• Regular evaluation of control measures' effectiveness is essential for maintaining safety standards in laboratory settings.

Standard Microbiological Practices

This segment outlines essential standard practices for maintaining safety in laboratories while handling potentially hazardous materials.

Key Standard Practices

• Access control to labs with appropriate signage like biohazard signs is crucial for safety awareness.

Opening Cultures and Handling Specimens

This section discusses the risks associated with handling blood, serum samples, and infectious materials in a laboratory setting.

Prioritizing Safety Measures

• Importance of decontamination and disposal of infectious material.

• Necessity of pre-employment health checks and maintaining medical histories.

• Utilization of safety equipment like biosafety cabinets and centrifuges for handling infectious materials.

• Use of personal protective equipment (PPE) including gloves, goggles, masks, and face shields to prevent exposure to hazardous materials.

Laboratory Biosafety Measures

This section emphasizes the significance of safety measures within laboratory facilities to prevent exposure to infectious materials.

Ensuring Laboratory Safety

• Implementation of secondary barriers such as self-closing doors with locks in laboratories.

• Requirement for hand-washing sinks near exit doors for proper hygiene maintenance.

• Design considerations for laboratories including impervious bench drops and easily cleanable surfaces.

Waste Disposal Protocols

Focuses on the correct disposal methods for different types of waste generated in a laboratory setting.

Proper Waste Management

• Categorization of waste into non-contaminated, contaminated sharps, and infectious materials for appropriate disposal methods.