Having judged the effectiveness of existing controls during assessment, the PCBU determines what further action is needed. It must always aim to eliminate the risks, although elimination is often impossible for biological hazards; where it is not reasonably practicable the risks must be minimised as much as is reasonably practicable. A combination of controls is usually needed, though one control can reduce several hazards transmitted the same way (ventilation plus respirators for several airborne hazards). Baseline controls such as good air quality, routine cleaning and suitable PPE protect against some hazards such as communicable diseases and are supplemented by specific controls such as an air monitoring programme for others. Advice from health, agricultural, biosecurity and WHS authorities and other experts (Appendix J) helps identify evidence-based controls. Where knowledge of a hazard is limited, as with a new strain of avian influenza, the PCBU should take a precautionary approach until there is greater certainty: follow the latest guidance from the relevant authorities, review information from industry groups and peak bodies, consider hazards with similar sources and exposure routes and whether their controls would help, and consult workers throughout.

Australia Model Code of Practice Managing the Risks of...

Other controls in Chapter 6 Controlling the risks: elimination, the hierarchy and selecting controls – Australia Model Code of Practice Managing the Risks of Biological Hazards at Work

6.1-ADMIN Minimise remaining risk with administrative controls: policies and procedures for vaccination against workplace vaccine-preventable diseases per the Australian Immunisation Handbook, hygiene and distancing, routine and post-exposure cleaning, disinfection and sterilisation, inspection and maintenance including monitoring and treatment of air handling, water systems and cooling towers, surveillance testing of staff in contact with vulnerable people during high transmission, waste storage, handling, treatment and disposal, outbreak and pandemic policies; changed work methods such as more frequent cleaning and task rotation; information, training, instruction and signage; and checks that administrative controls are followed
6.1-ELIM Eliminate exposure where reasonably practicable by removing sources or preventing hazards: pest control, building maintenance and effective ventilation to prevent mould and moisture, rejecting contaminated or damp goods, oral rather than intravenous medication where appropriate to avoid needles, and keeping unwell people away through working from home or leave, sending unwell children home, rescheduling or virtual appointments and remote ordering
6.1-PPE Minimise remaining risk with suitable PPE provided free, suited to the worker, the work and the environment and meeting relevant Australian Standards, with policies and procedures on use, maintenance, cleaning or disposal and storage, training including safe removal of contaminated PPE, correct selection for the hazard and exposure level including respirator protection factors, fit testing of tight-fitting respirators before first use, regular checks, correct use, and compatibility between items such as goggles and mask seals
6.1-SIE Where elimination is not reasonably practicable, minimise exposure with substitution (lower-risk activities such as HEPA vacuuming or wet mopping instead of dry sweeping, lower-risk materials and organisms, disposable rather than reusable equipment), isolation (dedicated contained areas, separation of high-risk areas from offices and break areas, dedicated decontamination spaces, access restriction, scheduling, temporary barriers, isolating unwell animals, point-of-generation waste containment, quarantine) and engineering controls (UV disinfection, biosafety cabinets, enclosed HEPA-filtered cabins, safety-engineered sharps, automated handling and water treatment systems, hygiene facilities, non-touch taps and bins, protective screens, food facilities, HVAC and HEPA filtration, local exhaust ventilation, mechanical ventilation of animal facilities, air locks and negative pressure rooms)
6.2 Select controls in consultation with workers and HSRs, preferring the most effective, reliable and protective measures high in the hierarchy, suited to the workplace and workers, reasonably practicable in the circumstances and not creating new hazards, doing more and combining controls as the risk grows

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The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.

MCP endpoint All Australia Model Code of Practice Managing the Risks of Biological Hazards at Work controls