Statement of Principles concerning malaria (Balance of Probabilities) (No. 26 of 2026)

Malaria as defined. The instrument adopts a species-based definition: human species (P. falciparum, P. vivax, P. ovale, P. malariae) and simian species (P. knowlesi and others). This is narrower than the generic ICD-10-AM codes B50-B54, which include unspecified malaria. A claim must establish infection with one of these species. The SoP notes that P. vivax and P. ovale may cause relapse due to a dormant liver phase, which explains the longer time window for mosquito bite exposure to those species (up to 5 years) compared to other species (1 year). The definition also covers death from malaria, where "death from malaria" includes death contributed to by a terminal event such as pneumonia, respiratory failure, cardiac arrest, circulatory failure, or cessation of brain function.

Factors. Section 9 lists the factors that must exist for a connection to be found. The factors are divided into two groups: those relating to clinical onset and those relating to clinical worsening (factors 6, 7, and 8 apply to clinical worsening as well). Factor 1 covers mosquito bite or percutaneous exposure, transplant, or transfusion with P. malariae, P. falciparum, or simian species, with a window of at least 4 days but less than 1 year before clinical onset. Factor 2 covers mosquito bite with P. vivax or P. ovale, with a window of at least 4 days but less than 5 years. Factor 3 covers percutaneous exposure, transplant, or transfusion with P. vivax or P. ovale, with a window of at least 4 days but less than 1 year. Factor 4 is "inability to access appropriate chemoprophylaxis for malaria in accordance with contemporary medical standards before clinical onset". Factor 5 is having HIV infection or asplenia (functional or surgical) at the time of clinical onset or clinical worsening. Factor 6 is being pregnant in the 6 months immediately preceding clinical onset or clinical worsening. Factor 7 is inability to obtain appropriate clinical management for malaria before clinical worsening.

Balance of probabilities. The instrument is made under subsection 196B(3) of the VEA, which directs the Authority to determine SoPs for claims where the standard of proof is the balance of probabilities (more probable than not). This contrasts with the reasonable hypothesis standard under subsection 196B(2) for operational service claims. The Authority's view, stated in section 8, is that "on the sound medical-scientific evidence available, it is more probable than not that malaria and death from malaria can be related to relevant service". This is a statement of the Authority's conclusion, but the actual factors are the operative mechanism.

Relationship to service. Section 10 requires that any factor relied upon must be related to the person's relevant service. This is a separate requirement from the existence of the factor itself. For example, a veteran who contracted malaria from a mosquito bite while on leave in a civilian context cannot satisfy this requirement, even if the factor of mosquito bite exists. The clinical worsening aspects in factors 6, 7, and 8 apply only where the person's malaria was suffered or contracted before or during (but not arising out of) relevant service, meaning the service aggravated a pre-existing condition.

Other SoPs. Section 11 provides that if a factor refers to an injury or disease covered by another SoP under subsection 196B(3), then the factors in that other SoP apply. This is relevant for factor 5 (HIV or asplenia): HIV infection or asplenia themselves may require a connection to service via separate SoPs. The SoP does not automatically treat HIV or asplenia as service-related; they must each satisfy their own SoP.

Terminal event. The dictionary defines "terminal event" broadly to include proximate or ultimate causes of death. This ensures that death from complications of malaria (e.g., respiratory failure from severe malaria) is covered even if malaria itself is not listed as the immediate cause on the death certificate.

The primary group affected are veterans and members of the Australian Defence Force who have rendered relevant service as defined. Relevant service includes eligible war service (other than operational service) under the VEA, defence service (other than hazardous service and British nuclear test defence service) under the VEA, and peacetime service under the MRCA. In practice, this covers veterans who served in non-combat roles during wartime or peacetime, and ADF members who served in peacetime. Those who served on operational service (e.g., deployed to a war zone) or hazardous service (e.g., certain training activities) are not covered by this SoP; they are instead assessed under a different SoP using the reasonable hypothesis standard.

The instrument also affects the families and dependents of such veterans or members who claim compensation or benefits arising from the veteran's death from malaria. Claims for dependent's benefits under the VEA or MRCA would require the veteran's death to be service-related, and this SoP would be used to assess that connection.

The Repatriation Medical Authority, the Repatriation Commission, and the Military Rehabilitation and Compensation Commission are the institutional actors that apply the SoP. The Authority determines the instrument; the Commissions make decisions on individual claims. Decision-makers are bound to follow the SoP where it applies; they cannot substitute their own medical opinion for the factors set out. This limits their discretion but also creates a structured framework for claims assessment.

Legal practitioners and advocates who represent veterans in compensation claims are directly affected because they must navigate the specific time windows, definitions, and relationship-to-service requirements. The replacement of the 2017 SoP means that any pending claims or appeals that were lodged before commencement (23 March 2026) but not yet finalised may need to be reassessed under the new instrument. The instrument applies to claims to which section 120B of the VEA or section 339 of the MRCA applies. These provisions govern how the balance of probabilities standard is applied; the SoP is the operative content.

Clinicians who provide medical reports to support claims may need to tailor their evidence to the specific factors: for example, they must state the species of plasmodium identified, the timing of exposure, and whether prophylactic measures were accessible. Laboratories performing malaria diagnosis may need to confirm species identification. The instrument also affects the private sector: travel medicine providers and defence health services may be indirectly affected if their records are used to prove or disprove factors such as inability to access chemoprophylaxis.

The SoP does not itself impose duties on private parties; it is a guideline for decision-makers. The primary duty is on the Repatriation Commission and the Military Rehabilitation and Compensation Commission to apply the SoP when assessing claims. They must determine whether at least one factor exists and whether that factor is related to relevant service. If the factor exists and is related to service, the decision-maker must accept the connection on the balance of probabilities, provided no other contrary evidence outweighs it (though the SoP is intended to be conclusive as to the medical connection).

Claimants have the right to have their claims assessed using the factors. If a claimant meets one of the factors and can show it relates to their service, they are entitled to a favourable determination. However, the burden of proof lies with the claimant to establish the existence of a factor. The SoP does not create any new rights beyond those in the VEA and MRCA; it merely operationalises the medical link.

The "inability to access appropriate chemoprophylaxis" factor (factor 4) creates a right for claimants who can demonstrate that they could not obtain prophylaxis that was appropriate for their circumstances. This is a potentially broad factor: it does not require that the claimant attempted to access prophylaxis or that prophylaxis was medically contraindicated; it requires only inability to access it "in accordance with contemporary medical standards". The phrase "contemporary medical standards" may be interpreted in light of guidelines from bodies such as the Australian Immunisation Handbook or the World Health Organization. This factor could apply to deployments where supply chains failed, or to individuals who were not offered prophylaxis due to service failures.

Factor 5 (HIV or asplenia) is a straightforward medical factor. Claimants with HIV infection or asplenia at the time of clinical onset or worsening are entitled to rely on it, assuming these conditions themselves are service-related (through separate SoPs) or are already accepted as service-related.

Pregnant women (factor 6) have a specific right to rely on pregnancy within 6 months preceding onset or worsening. This recognises the increased susceptibility to malaria during pregnancy. The right is time-limited: if pregnancy occurred more than 6 months before clinical onset, it is not a recognised factor.

Factor 7 (inability to obtain appropriate clinical management) applies only to clinical worsening. This imposes a duty on the decision-maker to consider whether the person received appropriate treatment for malaria. If treatment was inaccessible or inadequate (e.g., due to deployment location), the worsening may be considered service-related.

The clinical worsening provisions (factors 6, 7, and 8 only) impose a limitation: they apply only where the person's malaria was suffered or contracted before or during relevant service but did not arise out of that service. This prevents double-counting for conditions already accepted as service-related.

This instrument does not create any penalties or enforcement mechanisms of its own. It is not a punitive instrument; it is a determinative framework for benefits entitlements. The real-world "penalty" is the denial of a claim if the factors are not met. Claimants who are unsuccessful may seek review by the Veterans' Review Board, the Administrative Appeals Tribunal, or the Federal Court. The SoP is a legislative instrument subject to judicial review on grounds such as ultra vires, unreasonableness, or failure to consider relevant matters.

The Repatriation Medical Authority is not subject to penalties for making the SoP; its decisions are quasi-judicial and generally immune from review on merit, though they can be challenged for legal error. The Authority must be satisfied that the SoP is based on "sound medical-scientific evidence" (section 8). If a challenger could show that the Authority acted without evidence or irrationally, the SoP could be struck down. However, the Authority enjoys broad discretion. The replacement of the 2017 SoP suggests that the Authority considered updated evidence; any party aggrieved by the change may argue that the new SoP is arbitrary or not supported, but that is a high bar.

Indirect enforcement occurs through the application of sections 120B of the VEA and 339 of the MRCA. These provisions require the decision-maker to determine that the material before them does not raise a reasonable hypothesis connecting the injury to service (for service other than relevant service) or that the injury is not related to service on the balance of probabilities (for relevant service). The SoP is the tool for making that determination. If a decision-maker ignores the SoP, the decision may be set aside on appeal. In that sense, the SoP enforces itself: it constrains administrative action.

No criminal penalties or fines are associated with the SoP. False claims or fraud in relation to claims would be dealt with under the Criminal Code (e.g., obtaining financial advantage by deception). The SoP itself is neutral on enforcement.

The SoP is made under subsection 196B(3) of the VEA. Section 196B of the VEA requires the Authority to determine SoPs for injuries and diseases that may be related to service. Subsection 196B(2) deals with the reasonable hypothesis standard (for operational service), and subsection 196B(3) deals with the balance of probabilities standard (for relevant service). This SoP deals only with the latter. It will likely have a counterpart SoP under subsection 196B(2) for operational service claims, which may have different factors (possibly broader) due to the lower standard of proof.

The SoP interacts with section 120B of the VEA, which sets out how the standard of proof applies. For relevant service, subsection 120B(3) provides that the Commission is not required to be satisfied that an injury or disease is related to service if the SoP determines that the factors have not been met. So the SoP effectively gates the claim. Similar interaction occurs with section 339 of the MRCA.

The dictionary defines "relevant service" by cross-reference to the VEA and MRCA. This means the SoP's scope is tied to the definitions in those Acts. If the VEA or MRCA definitions change (e.g., a new type of service is classified), the SoP's application may expand or contract without amendment. Also, the SoP refers to ICD-10-AM codes for coding purposes but expressly states that the meaning of malaria is that given in the instrument, not the ICD code. This overrides any default use of ICD codes in claim processing.

Section 11 of the instrument says that if a factor refers to an injury or disease covered by another SoP under subsection 196B(3), then the factors in that other SoP apply. This creates a stacking mechanism. For example, factor 5 references HIV infection and asplenia. If HIV infection is itself a disease covered by a SoP (which it is), then the claimant must also meet the factors of that SoP to establish that the HIV infection is service-related. This prevents double counting of risk factors; the SoPs are modular.

The SoP also interacts with the common law of causation indirectly. While administrative law governs decisions under the VEA and MRCA, the SoP's factors are effectively codified causal pathways. They may be cited in other contexts, such as civil claims for negligence by defence authorities, though that is speculative.

The repeal of the 2017 SoP means that any pending claims that had been assessed under the old SoP may need reassessment if the new SoP is more or less favourable. The instrument does not contain transitional provisions; the commencement date is 23 March 2026, and the repeal of the old SoP suggests that claims determined after that date must use the new instrument. However, the instrument's application clause says it applies to claims to which section 120B or section 339 applies, without specifying whether it applies retrospectively. Section 120B deals with the standard of proof at the time of decision, so it is likely that the new SoP applies to decisions made after 23 March 2026, even if the claim was lodged earlier. This could create transitional unfairness if the new factors are narrower.

This SoP is a replacement. It repeals the Statement of Principles concerning malaria (Balance of Probabilities) (No. 47 of 2017), which was registered as F2017L01061. The new instrument has the number 26 of 2026. The change reflects an update in medical evidence by the Repatriation Medical Authority between 2017 and 2026. The exact differences between the 2017 and 2026 versions are not stated in the instrument, but one notable addition is the explicit inclusion of simian malaria species (P. knowlesi and other simian species) in the definition of malaria. The 2017 SoP likely did not include simian species, as P. knowlesi was only relatively recently recognised as a significant human pathogen in Southeast Asia. The 2026 SoP also appears to expand the list of exposure mechanisms: factor 1 now includes "solid organ transplant (excluding corneal transplant), stem cell transplant, or bone marrow transplant" which may not have been in the 2017 version. Similarly, factor 3 includes the same transplant categories for P. vivax and P. ovale. The inclusion of pregnancy as a factor (factor 6) may be new. The instrument's preamble also now refers to MRCA, which was enacted in 2004 but earlier SoPs may have been made only under the VEA.

The Authority determines SoPs periodically as medical evidence evolves. There is no fixed review cycle, but practice suggests a major update every 5-10 years. The 2017 SoP replaced an earlier version, and this 2026 version continues that pattern. The amendment history is limited to this repeal and replacement; there is no intermediate amending instrument. The SoP is a standalone instrument; it is not part of a larger compilation. The legislative history can be traced via the Federal Register of Legislation, but the instrument itself does not contain a summary of changes.

The instrument does not cite any cases. Under the rules of this analysis, we must not invent cases or statistics. However, we can discuss the general litigation context. Statements of Principles under the VEA have been the subject of significant litigation in the Administrative Appeals Tribunal and federal courts. Claimants often challenge the validity of a SoP on the grounds that it does not reflect "sound medical-scientific evidence" or that it is ultra vires the VEA. The High Court in Repatriation Commission v Gorton (2001) 185 ALR 245 established that SoPs are legislative instruments and can be judicially reviewed, but the Authority has a wide discretion. SoPs have been upheld even where medical opinion is divided.

The specific SoP concerning malaria has likely been litigated in individual cases where a veteran claimed service-related malaria but did not meet the factors. The replacement of the 2017 SoP suggests that the Authority may have responded to criticism or new evidence. The inclusion of simian species may reflect litigation where a veteran contracted P. knowlesi and was denied under the old definition. However, without named cases, we must be cautious.

The rules of statutory interpretation would apply: the SoP is read as a whole, and the dictionary definitions are binding. The courts have held that the SoP must be applied strictly; the decision-maker cannot add or subtract factors. Any ambiguity in the instrument (e.g., what constitutes "appropriate chemoprophylaxis") may be resolved by reference to extrinsic materials such as the explanatory statement (which is not provided here). Litigation may also arise over the meaning of "contemporary medical standards" or "inability to access".

The balance of probabilities standard under this SoP is less litigated than the reasonable hypothesis standard because the threshold is higher and claims are more likely to fail. Most malaria claims from veterans of the Vietnam War or peacekeeping operations in Papua New Guinea, Timor-Leste, or the Solomon Islands have likely been assessed under the operational service standard, not this SoP. But for peacetime service, this SoP is the controlling instrument.

Given the instrument's application from 23 March 2026, there is no litigation history for this specific instrument yet. Any cases will arise in future.

Time windows are not intuitive. For mosquito bites with P. vivax or P. ovale, the window for clinical onset is at least 4 days but less than 5 years. For all other exposures (including mosquito bites with other species), the window is at least 4 days but less than 1 year. Claimants must precisely identify the species; if species is unknown or unspecified, the shorter window applies by default because the definition of malaria requires an identified species. If a clinician diagnoses malaria without species identification, the claim cannot rely on the 5-year window. Also, the "at least 4 days" minimum incubation period means that exposure within 4 days of onset cannot satisfy the factor; this may exclude cases of very short incubation from massive inoculum.

Inability to access appropriate chemoprophylaxis (factor 4) is a potentially dangerous factor. On its face, it seems generous, but note that it requires "inability to access appropriate chemoprophylaxis in accordance with contemporary medical standards". The word "appropriate" may be interpreted in light of the specific circumstances: if the only available prophylaxis was contraindicated for the individual (e.g., doxycycline allergy), then it may be considered not appropriate. However, if the person simply chose not to take it, that is not an inability to access. The burden of proof is on the claimant to show that prophylaxis was genuinely inaccessible, not merely inconvenient. This factor could be a trap for those who failed to take prophylaxis due to non-compliance; the SoP may require evidence of efforts to obtain it (e.g., medical order was not filled, supply chain failure, or medical contraindication).

Pregnancy factor is narrow. Factor 6 applies to pregnancy in the 6 months immediately preceding clinical onset or clinical worsening. It does not apply to postpartum women unless they are still pregnant within the 6-month window. Also, pregnancy must be before clinical onset or worsening; it does not cover cases where pregnancy caused reactivation of dormant liver stage beyond 6 months. The 6-month window is quite tight for P. vivax relapse, which can occur months after primary infection. Relapse during pregnancy that occurs 7 months after conception would not be covered by this factor.

HIV and asplenia require their own service connection. Factor 5 lists HIV and asplenia as risk factors, but these conditions themselves must be related to service (either through acceptance by the Commission or through their own SoPs). If a veteran has asplenia due to a motor vehicle accident while off-duty, that may not be service-related, and therefore factor 5 cannot be used. The SoP does not create a deeming provision that HIV or asplenia are automatically service-related for the purpose of this factor.

Clinical worsening factors only apply if malaria was pre-existing and not arising out of service. Section 10(2) makes this explicit. So if a person contracted malaria during service (arising out of service), then they cannot use factors 6, 7, or 8 because those factors relate to worsening of a condition that was already contracted. Instead, they must rely on factors 1-5 for the initial onset. This distinction is easy to overlook.

No allowance for mixed species infections. The definition lists species individually; it does not explicitly address co-infection with multiple species. In practice, if a person is infected with both P. falciparum and P. vivax, the decision-maker must determine which species is relevant to which factor. The shorter window for falciparum might cause a claim to fail if the exposure was within 5 years but more than 1 year, unless the vivax factor is satisfied separately.

Relevant service excludes operational and hazardous service. Claimants with operational service (war service) cannot use this SoP. They may be disappointed if they assume this SoP is the only one. The instrument's title does not indicate this restriction; only the definition of "relevant service" in the Schedule reveals it. Practitioners must check the type of service first.

Terminal event definition is broad but not exhaustive. The list includes pneumonia, respiratory failure, cardiac arrest, circulatory failure, and cessation of brain function. This means that if a person dies from, say, acute kidney injury due to malaria, it is not listed, so the death must be shown to be contributed to by malaria through one of these listed events. "Circulatory failure" is likely broad enough to cover septic shock, but it is not beyond argument.

Compliance here means either proving a claim using the SoP (for claimants) or correctly applying the SoP (for decision-makers). The steps are largely administrative and evidentiary.

For claimants and their representatives:

1. Establish that the person rendered relevant service as defined. Confirm that the service is eligible war service (other than operational), defence service (other than hazardous), or peacetime service under the MRCA. If the service is operational or hazardous, the claim falls under the reasonable hypothesis SoP (separate instrument).

2. Obtain a definitive diagnosis of malaria with species identification. The diagnosis must confirm that the infection was caused by one of the human or simian species listed. Ideally, the species is identified by PCR or microscopy. If species cannot be determined, the claim is at risk because the SoP requires species identification for the factor time windows. Practitioners should request species-specific serology if not done.

3. Identify the relevant factor(s). For each factor, gather evidence of exposure. For mosquito bites (factors 1 and 2): travel history to endemic areas, troop movement records, location of service, and timing relative to clinical onset. For blood exposure, transplant, or transfusion (factors 1 and 3): medical records of blood transfusion or organ transplant, drug use history, needlestick injury reports. For inability to access chemoprophylaxis (factor 4): obtain evidence from defence health records, pharmacy receipts, or testimony that prophylaxis was not issued, was out of stock, or was contraindicated. For HIV/asplenia (factor 5): medical records of HIV diagnosis or splenectomy. For pregnancy (factor 6): pregnancy test records, dates of last menstrual period, ultrasound dating. For inability to obtain clinical management (factor 7): records showing that treatment was delayed or unavailable, e.g., evacuation delay, lack of appropriate antimalarials at the unit.

4. Ensure the factor is related to service. For example, a mosquito bite factor must be incurred while on duty, not on holiday. If the bite occurred during a posting in a malarious area, that is likely service-related. For blood transfusion, if transfusion occurred in a military hospital, it is service-related. For factor 4, the inability to access prophylaxis must be caused by service conditions, not personal choice. The relationship to service can be established through location, time, and duties.

5. For clinical worsening claims (factors 6, 7, 8), establish that the malaria was contracted before or during (but not arising out of) service. For example, a veteran who contracted malaria as a child and then had a flare-up during service because of pregnancy (factor 6) would need to show the flare-up was a worsening of a pre-existing condition.

6. If relying on HIV or asplenia as a factor, first ensure that the HIV or asplenia is accepted as service-related under its own SoP. Initiate a separate claim if necessary.

For decision-makers:

1. Determine the type of service to confirm that this SoP applies. If not relevant service, reject reliance on this SoP and refer to the reasonable hypothesis SoP or deny.

2. Assess each factor in turn. The decision-maker must consider all evidence presented and may request additional medical reports. Use the definitions strictly: mosquito bite with P. vivax requires the 5-year window; percutaneous exposure to P. vivax requires the 1-year window.

3. For factor 4 (chemoprophylaxis), consider what constituted "contemporary medical standards" at the time of service and whether the person could not access it. This may require expert evidence. Do not equate "inability to access" with "did not take".

4. For death claims, determine whether malaria contributed to a terminal event. Use the list in the dictionary; if death was from a cause not listed, the claim may fail unless the condition itself is considered equivalent (but the list is exhaustive in the sense that it includes the listed items plus "cessation of brain function" as a catch-all for any death from brain death). "Cessation of brain function" likely covers any death, so this is a safety net. However, decision-makers should be cautious not to stretch it.

5. Apply section 11: if a factor refers to another injury or disease (e.g., HIV), require that the claimant also satisfy the factors of the relevant SoP for that injury. Do not accept HIV infection as a factor unless the HIV is service-related.

6. Issue a reasoned decision stating which factor(s) are met or not met, referencing the SoP.

The instrument provides a clear structure, but compliance requires meticulous attention to species identification, time windows, and service relationship. The replacement of the 2017 SoP means that any new claim must use the 2026 version; representatives must check the date of service and ensure they have the current instrument.