Diagnostic Assessment — Gastrointestinal - Cryptosporidium Enteritis
Example 1 of 1 · fictitious patient (Veteran C)
Diagnostic Assessment
Gastrointestinal – Cryptosporidium Enteritis (A07.2)
Gastrointestinal – Irritable Bowel Syndrome (K58.9)
Gastrointestinal – Gastroenteritis, Presumed Viral (A08.4)
Gastrointestinal – Viral Gastroenteritis (A08.4)
Gastrointestinal – Blastocystis hominis Infection (B71.0)
Balance of Probabilities: Irritable Bowel Syndrome SOP No. 66 of 2019
Reasonable Hypothesis: Irritable Bowel Syndrome SOP No. 65 of 2019
ADF History
The veteran, Communications and Information Systems Controller (CISCON), enlisted 28 July 1986, transferred to Reserves 22 Mar 2003.
Occupational History
As a Communications and Information Systems Controller in the RAAF, the veteran was exposed to significant occupational hazards including deployment to austere environments with limited access to safe food and water, communal living conditions facilitating pathogen transmission, and operational environments where consumption of contaminated food sources was a known risk. His deployments to an overseas deployment (1997) and an overseas area of operations (2008) involved reliance on local food sources and truck stop meals during transit, significantly increasing exposure to foodborne pathogens.
History
The veteran a CISCON in the RAAF, contracted multiple gastrointestinal infections during a 2012 deployment to remote the territory, primarily from consuming a contaminated truck stop pie, which led to cryptosporidium enteritis and blastocystis hominis infection, subsequently developing post-infectious irritable bowel syndrome. He also experienced several episodes of viral gastroenteritis during his service from 2000-2002, linked to communal military living conditions.
Timeline
- 08 Aug 1994 - the veteran presented with presumed gastroenteritis during his service as a CISCON, experiencing diarrhea with three episodes daily, hunger-type abdominal pains, and abdominal rumbling, with no systemic symptoms suggesting a mild viral infection. The condition was managed with increased fluid intake, with blood pressure recorded at 104/68 mmHg and diffuse abdominal findings on examination. The patient reported feeling otherwise well, indicating a self-limiting course typical of viral gastroenteritis in military communal settings.
- 09 Aug 1994 - On day two of illness, the veteran presented with ongoing viral gastroenteritis exacerbated by stress, specifically noting personal stress from a relationship breakup alongside the gastrointestinal symptoms. Clinical presentation included persistent abdominal rumbling with stable vital signs (blood pressure 110/70 mmHg, pulse 70, temperature 36.2°C), and stool samples were ordered for comprehensive pathogen testing including microscopy, culture, and specific organism identification. The condition highlighted the interplay between occupational and personal stressors in military environments.
- 08 Aug 1996 - the veteran developed probable viral gastroenteritis with an additional productive cough component, presenting with three bowel movements in one day but no vomiting, suggesting a combined gastrointestinal and respiratory viral syndrome. The condition was managed with Maxalon (metoclopramide) for gastric discomfort, indicating symptomatic treatment approach, with the presentation reflecting the ongoing risk of viral infections in communal military living environments throughout his service period.
- 10 Apr 2006 - the veteran began experiencing gastrointestinal symptoms during deployment to remote the territory, later diagnosed as cryptosporidium enteritis and blastocystis hominis infection, with symptom onset attributed to consuming a contaminated truck stop pie during operational transit. The initial symptoms included loose diarrhea that progressively worsened over the following week, accompanied by mild abdominal discomfort and general malaise consistent with parasitic infection. The deployment environment presented significant risks due to limited access to safe food sources and reliance on roadside establishments during operational movements.
- 17 Apr 2006 - the veteran presented with one-week history of loose diarrhea and headaches, initially diagnosed as bacterial gastroenteritis but later confirmed as dual parasitic infection with cryptosporidium and blastocystis. Clinical presentation included moderate symptoms with three to four loose bowel movements daily, mild headaches, and no abdominal pain, nausea, or vomiting, with physical examination revealing soft, non-tender abdomen and temperature of 37.3°C. Treatment included empirical therapy with Azithromycin, Loperamide, Ondansetron, and Panadeine, with admission to 2nd Health Support Battalion for inpatient management due to symptom severity and operational impact.
- 22 Apr 2006 - Pathology confirmation of cryptosporidium enteritis and blastocystis hominis infection via stool sample analysis, presenting with persistent diarrhea and fatigue significantly impairing deployment duties and requiring specialized treatment planning. The dual parasitic infection necessitated notification to the state Health Department due to public health significance, with ongoing loose stools occurring multiple times daily and associated lethargy affecting operational effectiveness. Nitazoxanide treatment was planned pending Therapeutic Goods Administration approval, reflecting the severity and persistence of symptoms resistant to standard therapies.
- 31 Apr 2006 - the veteran reported persistent cryptosporidium and blastocystis symptoms with Nitazoxanide 500mg twice daily for three days approved for targeted antiparasitic therapy, indicating ongoing severity despite two weeks of symptomatic management. Clinical presentation included continued diarrhea with multiple daily episodes, mild abdominal discomfort, and fatigue severely limiting operational effectiveness, requiring specialist oversight and referral to Princess Alexandra Hospital infectious disease consultation. The patient's proactive attempts to source medication through alternative channels highlighted treatment urgency and deployment logistical challenges.
- 15 Apr 2006 - the veteran developed irritable bowel syndrome as a direct sequela of the cryptosporidium and blastocystis infections, presenting with abdominal discomfort escalating to crippling pain, alternating diarrhea and constipation, bloating, and incomplete evacuation feelings. The post-infectious IBS represented a chronic functional gastrointestinal disorder directly linked to the preceding parasitic infections, significantly impacting quality of life and requiring ongoing management by general practitioner. The condition demonstrated the long-term consequences of deployment-related foodborne infections, with symptoms persisting beyond resolution of the primary infectious process.
Symptoms
At the time of the 2012 infections, the veteran experienced acute symptoms including frequent loose diarrhea (3-4 episodes daily), headaches, mild abdominal discomfort, and fatigue that significantly impaired his operational duties during deployment. The viral gastroenteritis episodes in 2000 and 2002 presented with typical symptoms of diarrhea, abdominal pain, and in one case concurrent respiratory symptoms.
Currently, the veteran suffers from chronic irritable bowel syndrome as a sequela of the 2012 parasitic infections, characterized by ongoing abdominal discomfort that can escalate to severe pain, alternating bowel habits between diarrhea and constipation, bloating, and feelings of incomplete evacuation. These symptoms significantly impact his daily functioning and quality of life, requiring ongoing symptomatic management with limited therapeutic response.
Imaging
No imaging studies were performed for these gastrointestinal conditions.
1. What is the formal diagnosis of the condition claimed above?
Cryptosporidium Enteritis (A07.2) - No specific DVA SOP available, ICD-10 code A07.2. Cryptosporidium enteritis is an infectious diarrheal disease caused by the protozoan parasite Cryptosporidium, typically contracted through ingestion of contaminated food or water. The infection causes acute gastroenteritis with frequent, watery diarrhea, abdominal pain, and systemic symptoms including fatigue and headache.
Irritable Bowel Syndrome (K58.9) - DVA SOP No. 65 of 2019 (RH) and No. 66 of 2019 (BOP), ICD-10 code K58.9. Irritable bowel syndrome is a functional gastrointestinal disorder characterized by recurrent abdominal pain associated with defecation and/or changes in bowel habits, in the absence of structural abnormalities.
Gastroenteritis, Presumed Viral (A08.4) and Viral Gastroenteritis (A08.4) - No specific DVA SOP available, ICD-10 code A08.4. Viral gastroenteritis is an acute inflammatory condition of the stomach and intestines caused by viral pathogens, resulting in diarrhea, abdominal pain, and associated symptoms.
Blastocystis hominis Infection (B71.0) - No specific DVA SOP available, ICD-10 code B71.0. Blastocystis hominis infection is a parasitic gastrointestinal infection caused by the protozoan Blastocystis hominis, often presenting with diarrhea, abdominal pain, and digestive symptoms.
The temporal relationship demonstrates that the 2012 cryptosporidium and blastocystis infections were concurrent, acquired from the same contaminated food source, and directly led to the development of post-infectious irritable bowel syndrome. The earlier viral gastroenteritis episodes were separate acute infections occurring during different periods of service.
2. For each diagnosis identified, please also provide the following dates:
When did the veteran first experience symptoms attributable to this condition?
Cryptosporidium Enteritis: 10 Apr 2006 [CHART REVIEW.docx, multiple pages; PTQ.pdf, Page 32]
Irritable Bowel Syndrome: 15 Apr 2006 [CHART REVIEW.docx, multiple pages]
Gastroenteritis, Presumed Viral: 08 August 1994 [CHART REVIEW.docx, multiple pages]
Viral Gastroenteritis: 09 August 1994 [CHART REVIEW.docx, multiple pages]
Blastocystis hominis Infection: 10 Apr 2006 [CHART REVIEW.docx, multiple pages]
When did the veteran first present to a health / medical provider for this condition?
Cryptosporidium Enteritis: 17 Apr 2006 to military medical officer at 2nd Health Support Battalion [CHART REVIEW.docx, multiple pages]
Irritable Bowel Syndrome: 15 Apr 2006 to general practitioner [CHART REVIEW.docx, multiple pages]
Gastroenteritis, Presumed Viral: 08 August 1994 to military medical officer [CHART REVIEW.docx, multiple pages]
Viral Gastroenteritis: 09 August 1994 to military medical officer [CHART REVIEW.docx, multiple pages]
Blastocystis hominis Infection: 17 Apr 2006 to military medical officer at 2nd Health Support Battalion [CHART REVIEW.docx, multiple pages]
When was the condition confirmed / formally diagnosed?
Cryptosporidium Enteritis: 22 Apr 2006 by pathology testing confirming Cryptosporidium antigen in stool sample [CHART REVIEW.docx, multiple pages]
Irritable Bowel Syndrome: 15 Apr 2006 by general practitioner based on post-infectious presentation [CHART REVIEW.docx, multiple pages]
Gastroenteritis, Presumed Viral: 08 August 1994 by military medical officer based on clinical presentation [CHART REVIEW.docx, multiple pages]
Viral Gastroenteritis: 09 August 1994 by military medical officer based on clinical presentation [CHART REVIEW.docx, multiple pages]
Blastocystis hominis Infection: 22 Apr 2006 by pathology testing confirming Blastocystis hominis in stool sample [CHART REVIEW.docx, multiple pages]
When did the veteran first present to you (or your practice) for this condition?
21 January 2015
3. How was this diagnosis confirmed? i.e. what were the key symptoms and signs, investigation results, specialist opinions? Please attach any relevant correspondence and investigation results.
Cryptosporidium Enteritis: Confirmed by positive Cryptosporidium antigen in stool sample on 22 Apr 2006, with key symptoms including one-week history of loose diarrhea (3-4 episodes daily), headaches, and fatigue. Physical examination revealed soft, non-tender abdomen with minimal distension and low-grade fever (37.3°C). [CHART REVIEW.docx, multiple pages providing pathology confirmation and clinical details]
Irritable Bowel Syndrome: Diagnosed based on post-infectious presentation following cryptosporidium infection, with key symptoms including abdominal discomfort escalating to severe pain, alternating diarrhea and constipation, bloating, and incomplete evacuation. Diagnosis made by general practitioner based on Rome criteria and temporal relationship to preceding infection. [CHART REVIEW.docx, multiple pages detailing symptom progression and clinical assessment]
Viral Gastroenteritis episodes: Diagnosed clinically based on characteristic symptoms of acute diarrhea, abdominal pain, and associated symptoms. The 2000 episodes were managed symptomatically with stool testing ordered for comprehensive pathogen screening. [CHART REVIEW.docx, multiple pages documenting clinical presentations and management]
Blastocystis hominis Infection: Confirmed by positive identification of Blastocystis hominis organisms in stool sample on 22 Apr 2006, concurrent with cryptosporidium infection. Clinical presentation identical to cryptosporidium with persistent diarrhea and systemic symptoms. [CHART REVIEW.docx, multiple pages providing pathology results and clinical correlation]
4. What do you consider to be the cause(s) of the condition in this veteran? Give consideration to constitutional and common risk factors, pre-existing injuries or diseases, and occupational or lifestyle risks, as well as direct causative mechanisms.
Irritable Bowel Syndrome (only condition with specific DVA SOP):
Having an episode of severe diarrhoea within the three months before the clinical onset (BOP) / within the six months before the clinical onset (RH) - This factor is MET. The veteran developed IBS on 15 Apr 2006, directly following cryptosporidium and blastocystis infections that commenced 10 Apr 2006, well within both timeframes.
Inability to obtain appropriate clinical management - This factor is MET. The delayed specific treatment of the precipitating cryptosporidium infection resulted in prolonged parasitic illness, contributing to the development of post-infectious IBS as a permanent consequence.
Other gastrointestinal conditions (no specific DVA SOPs available):
While these conditions do not have specific Statements of Principles, they occurred during warlike service and deployment conditions and may be compensable under direct causation provisions. The cryptosporidium enteritis, blastocystis hominis infection, and viral gastroenteritis episodes all arose from occupational exposures inherent to military service, including consumption of contaminated food during deployment and exposure to pathogens in communal living environments.
The inability to obtain appropriate clinical management applies to all conditions as referenced in Brew v Repatriation Commission (19 July 1990). There was significant delay between symptom onset and access to appropriate treatment, particularly for the parasitic infections requiring specialized therapy.
Note: As these conditions occurred after 09 May 1995 and during deployment (warlike service), they fall under MRCA legislation.
Sequelae
The irritable bowel syndrome is a direct sequela of the cryptosporidium enteritis and blastocystis hominis infections. Post-infectious IBS is a well-recognized complication following parasitic gastroenteritis, representing a functional disorder that develops as a consequence of the inflammatory response and disrupted gut microbiome from the initial infection.
Unintended Consequence
There is no evidence that any of these gastrointestinal conditions resulted from unintended consequences of ADF medical treatment. All conditions arose from infectious exposures during deployment or service-related activities.
Inability to Attain Appropriate Medical Management
This factor is MET for all conditions. The cryptosporidium and blastocystis infections demonstrate clear inability to obtain appropriate clinical management, as referenced in the precedent case Brew v Repatriation Commission (19 July 1990). There was a three-week delay between symptom onset and access to specific antiparasitic therapy (Nitazoxanide), during which time the veteran suffered from persistent severe symptoms that led to permanent worsening through development of post-infectious IBS. The delay occurred due to the need for Therapeutic Goods Administration approval and limited availability of specialized medications in the deployment setting, representing both objective inability (lack of available treatment) and systemic barriers that prevented timely appropriate management. This inability to obtain appropriate clinical management caused permanent worsening of the conditions by allowing the infections to persist longer than necessary, directly contributing to the development of chronic post-infectious IBS.
The % contribution of the causes is 100% and significant.
5. Please provide a Health Summary and a medication / prescribing history.
-see attached report
