Summary: Biological hazards — including bacteria, viruses, fungi, parasites, and biological toxins — pose significant threats to worker health across healthcare, laboratory, agriculture, and industrial settings. Organizations must comply with OSHA's Bloodborne Pathogens Standard (29 CFR 1910.1030) and implement systematic biohazard identification, risk assessment, engineering controls, and PPE programs to protect workers from exposure and prevent the spread of infectious agents in the workplace.
Table of contents
What is a Biological Hazard?
A biological hazard, also known as a biohazard, is any biological substance that threatens the health of living organisms — primarily humans. Specifically, biological hazards include bacteria, viruses, fungi, parasites, and biological toxins. Under OSHA’s Bloodborne Pathogens Standard (29 CFR 1910.1030) and the broader ISO 45001 framework, employers must identify, assess, and control biological hazard exposure in the workplace. As a result, health consequences range from mild skin irritation and allergic reactions to serious infections and chronic disease. In some cases, exposure can even lead to cancer.
Types of Biological Hazards
Biological hazards in the workplace come in many different forms. Therefore, understanding each category is the first step toward effective risk assessment and control. Below are the ten primary biological hazard categories, along with key workplace safety examples.
Sharp waste
Sharp waste falls under the broader category of infectious waste. Specifically, it includes needles, lancets, broken glass, and medical instruments that can pierce the skin. Consequently, these items can transmit bloodborne pathogens. OSHA’s Bloodborne Pathogens Standard requires that workers dispose of sharps in puncture-resistant, leak-proof containers. Furthermore, workers handling sharps must receive specific training to minimize needlestick injuries and pathogen exposure.
Airborne pathogens
Airborne pathogens are microorganisms that travel through the atmosphere via aerosols, respiratory droplets, or dust particles. In occupational settings, they can cause serious respiratory infections. For example, these infections include COVID-19, influenza, measles, and tuberculosis (TB). OSHA’s Respiratory Protection Standard (29 CFR 1910.134) and ISO 45001 both mandate controls to reduce worker exposure. In particular, these controls include engineering measures, administrative procedures, and appropriate respiratory PPE.
Human bodily fluids
Direct contact with human bodily fluids poses a significant biological hazard risk. In particular, these fluids include saliva, urine, mucus, and other secretions. Workers in healthcare, first response, childcare, and waste management face the most common exposure. Therefore, proper PPE selection, barrier precautions, and regular biohazard training are essential controls under OSHA’s General Duty Clause and bloodborne pathogen guidelines.
Human blood and blood-derived materials
Human blood and blood products represent a major biological hazard. In fact, they may carry bloodborne pathogens including HIV, Hepatitis B virus (HBV), and Hepatitis C virus (HCV). For this reason, OSHA’s Bloodborne Pathogens Standard (29 CFR 1910.1030) mandates exposure control plans, hepatitis B vaccination programs, and post-exposure evaluation procedures. Additionally, the standard requires universal precautions to protect workers who may contact blood or other potentially infectious materials (OPIM).
Microbiological waste
Microbiological waste typically comes from laboratory and research settings. For example, it may include concentrated infectious agents such as live virus cultures, bacterial specimens, and blood samples. Moreover, body fluids containing infectious diseases also fall into this category. As a result, strict containment, disposal, and decontamination protocols — aligned with biosafety level (BSL) requirements — are mandatory to prevent laboratory-acquired infections and community exposure.
Pathological waste
Pathological waste includes organs, tissues, and body components removed during surgery or autopsy. Moreover, this category of biological hazard can contain infectious pathogens linked to cancer, prion disorders, Creutzfeldt-Jakob disease, and mad cow disease. Consequently, healthcare facilities and research institutions must comply with both OSHA regulations and local medical waste disposal laws when handling pathological material.
Animal waste
Animal biological hazards include body parts, blood, excrement, and bedding from infected animals. Notably, animal droppings and waste may harbor bacteria, viruses, parasites, and other microorganisms that cause zoonotic diseases — illnesses that transfer from animals to humans. Workers in agriculture, veterinary care, pest control, and wildlife management face elevated exposure risk. Therefore, they should follow documented biosafety controls and PPE protocols.
Molds and yeasts
Molds and yeasts are fungi prevalent in nature that play an essential role in organic decomposition. However, in workplace settings, these microbes can colonize structures through direct contact or via airborne spore dispersal. Inhaling mold spores, fragments, or byproducts can trigger serious health issues. Specifically, these include hypersensitivity pneumonitis, allergic rhinitis, asthma, and invasive fungal infections. Therefore, OSHA’s General Industry Standards and NIOSH guidelines recommend source removal, ventilation improvements, and respiratory protection when mold exposure is confirmed or suspected.
Organic material
Workers can encounter biological hazards through contact with garbage, sewage, plant materials, and organic dust. These materials may harbor bacteria, viruses, fungi, and parasites. For example, associated illnesses include Salmonella, Giardia, E. coli, and Legionella. Industries such as waste management, agriculture, food processing, and construction carry elevated organic material exposure risk. As such, routine hazard assessments and protective controls are essential to workplace health and safety compliance.
Stinging bugs
Insects that bite, sting, or inject venom represent a biological hazard in outdoor and some indoor work environments. Common stinging insects include mosquitoes, fire ants, hornets, wasps, and bees. Furthermore, insect bites can transmit vector-borne diseases such as West Nile virus, Lyme disease, and malaria. Workers in construction, landscaping, forestry, and agriculture face the greatest exposure risk. As a result, they should have access to documented insect hazard controls and emergency response procedures for anaphylaxis.
Workplace Examples of Exposure to Biological Hazards
Workers across industries face distinct biological hazard exposure risks depending on their environment, tasks, and the materials they handle. In fact, according to the U.S. Bureau of Labor Statistics, biological hazard exposure continues to account for a significant share of reported workplace health incidents. The following examples show how biological hazard exposure occurs across common industry settings.
- Construction workers involved in repair, demolition, or excavation projects may encounter dust, mold, animal feces, and airborne infections. Disturbing contaminated soil, legacy building materials, or bird and rodent nesting sites can expose workers to pathogens associated with asthma, allergic responses, respiratory infections, and Hantavirus. Regular pre-task biological hazard assessments aligned with OSHA’s Hazard Communication Standard (29 CFR 1910.1200) are critical for this workforce.
- Agricultural workers who work with livestock, crops, or soil may be exposed to animal excrement, organic debris, stinging insects, and zoonotic illnesses — diseases that animals can transmit to humans. These exposures can cause skin irritation, gastrointestinal illness, parasitic infections, and serious systemic disease. ISO 45001-aligned risk management programs that address biological hazard identification and control are increasingly being adopted by leading agri-businesses.
- Laboratory personnel who handle, test, or dispose of biological samples may encounter human blood and blood products, microbiological waste, pathological waste, and sharps. These exposures carry risk of needlestick injuries, serious infections, and bloodborne illness transmission. Documented biosafety programs, annual training, and compliance with OSHA’s Bloodborne Pathogens Standard are mandatory for laboratory safety.
- Manufacturing workers in food, wood, paper, or textile production may be exposed to organic materials, molds, yeasts, and airborne pathogens. These biological hazards can cause food poisoning, occupational asthma, fungal disorders, and allergic reactions. Routine biological hazard inspections, proper ventilation, and PPE programs are essential compliance measures under OSHA General Industry Standards.
Regulations that Target Biological Hazards
A robust global regulatory framework governs biological hazard identification, risk management, and worker protection. Compliance with these standards is not optional. In fact, failure to control biohazard exposure can result in OSHA citations, worker compensation claims, and significant reputational harm. Key regulations include:
- The International Labour Organization (ILO) Convention No. 155 on Occupational Safety and Health and the Working Environment mandates that employers take precautions to ensure workers are not exposed to biological hazards that could damage their health or safety. It establishes the foundational employer duty of care for biohazard management in workplaces worldwide.
- The World Health Organization (WHO) International Health Regulations provide a framework for preventing, identifying, and managing global public health emergencies, particularly those caused by biological threats such as pandemic pathogens and bioterrorism agents.
- The European Union (EU) Directive 2000/54/EC on the protection of workers from risks related to exposure to biological agents at work classifies biological agents into four risk groups based on hazard level and specifies the conditions for safe handling, containment, and storage across European workplaces.
- The United States OSHA Bloodborne Pathogens Standard (29 CFR 1910.1030) regulates occupational exposure to human blood and other potentially infectious materials. It requires employers to maintain written exposure control plans, offer hepatitis B vaccinations, provide post-exposure evaluation, and ensure proper labeling, training, and PPE for all at-risk workers.
- The Canada Human Pathogens and Toxins Act regulates biosafety standards and containment procedures for facilities working with biological hazards. It governs the import, export, handling, manufacture, storage, and disposal of human pathogens and toxins to protect both workers and the public.
Help Mitigate Biological Hazards
Biological hazards represent one of the most consequential occupational health risks across industries. These risks span healthcare, construction, agriculture, and manufacturing. Therefore, a proactive, systematic approach to biological hazard identification, risk assessment, and control is essential. Organizations that implement structured biohazard management programs — aligned with ISO 45001, OSHA standards, and industry-specific codes — significantly reduce their TRIR. Additionally, they improve inspection completion rates and demonstrate audit-ready compliance.
Fortunately, Certainty is a powerful and easy-to-use solution for managing biological hazards in the workplace. With Certainty, you can:
- Create and conduct inspections, audits, and risk assessments using customizable checklists and forms that cover all aspects of biological hazard identification, evaluation, and control — including OSHA compliance checks, PPE assessments, and ISO 45001 gap analyses.
- Collect and analyze biological hazard data using a secure, cloud-based platform that provides real-time visibility across all sites and locations — eliminating the siloed, manual processes that lead to missed regulatory obligations.
- Generate reports and dashboards that deliver actionable insights and trend analysis on biological hazard performance, compliance status, inspection completion rates, and corrective action closure times — the KPIs that matter most to EHS managers and safety directors.
- Assign and track corrective actions that address identified biological hazards quickly, with clear ownership, due dates, and automated follow-up to prevent recurrence and close compliance gaps before regulatory audits.
Download our free Personal Protective Equipment (PPE) Assessment Checklist today.
Request a demo today and see how Certainty can help you mitigate biological hazards and improve your workplace safety and health.
Frequently Asked Questions (FAQs)
What is the difference between a biological hazard and a chemical hazard?
A biological hazard originates from a living organism or biological substance — such as a bacterium, virus, fungus, or parasite — that can cause illness or injury in humans. On the other hand, a chemical hazard involves non-living chemical substances that pose health or safety risks. Many workplaces must manage both types simultaneously; for example, a laboratory may handle both biological specimens and hazardous chemical reagents. OSHA standards address each hazard category under separate regulatory frameworks.
Which industries face the highest biological hazard risk?
Healthcare, laboratory research, agriculture, veterinary services, waste management, construction, and food processing consistently rank among the highest-risk industries for biological hazard exposure. Workers in these sectors face regular contact with bloodborne pathogens, airborne microorganisms, animal waste, mold, and organic materials. ISO 45001-compliant safety management systems help organizations in these industries systematically identify, assess, and control biohazard risks.
How should biological hazards be identified during a workplace inspection?
Effective biological hazard identification during workplace inspections involves reviewing job tasks and work areas for potential exposure sources, consulting OSHA biohazard standards, assessing PPE adequacy, reviewing incident and near-miss reports, and conducting interviews with workers about potential exposures. Inspection software like Certainty enables EHS teams to deploy standardized biological hazard checklists, capture photo evidence, and automatically trigger corrective actions when hazards are identified — ensuring nothing falls through the cracks.
What PPE is required for biological hazard exposure?
PPE requirements for biological hazard exposure depend on the type and level of hazard present. For example, common biological hazard PPE includes gloves (nitrile or latex), face shields or safety goggles, fluid-resistant gowns or coveralls, respiratory protection (N95 respirators or higher for airborne pathogens), and shoe covers. OSHA requires a documented PPE hazard assessment (29 CFR 1910.132) to determine the appropriate protection level for each workplace exposure scenario.
