Since its introduction in 1970, the Sakita-Miwa classification has become a cornerstone of gastrointestinal endoscopy, providing a practical and objective method for tracking ulcer healing. Its strength lies in its simplicity: by observing a few key characteristics—the presence of edema, the appearance of regenerating epithelium, the extent of white coating, and the nature of scar tissue—an endoscopist can accurately determine the ulcer's stage. This reliable framework is essential for clinical decision-making, from selecting appropriate therapies to designing rigorous clinical trials. Ultimately, the Sakita-Miwa classification ensures that clinicians worldwide can speak a common language when managing one of the most common gastrointestinal conditions, leading to more effective and consistent patient care.
The classification of disease is the fundamental backbone of medical practice. In biomedicine, classification systems like the ICD-11 categorize diseases based on distinct biological markers. However, in many developing nations and indigenous communities, "Folk Illnesses" persist. These are syndromes recognized only within a specific culture, often lacking direct equivalents in Western nosology.
The final stage of healing. The redness disappears, leaving a white, flat scar as fibrous tissue matures and capillary density decreases. Summary Table Clinical Feature Highlights Active Thick white coating, edema, discrete margins Healing Epithelial regeneration, shallower base, shrinking coating Scarring Complete closure; initially red, maturing into a white scar sakitamiwa classification
The original 2021 system defined only Stages 0–IV. However, a small series of survivors (n=19) developed a chronic fatigue syndrome with persistent arthralgia and elevated serum IL-6 for >6 months. This has been proposed as . Diagnostic criteria require: documented acute SKTV infection, no alternative rheumatologic diagnosis, and a Fatigue Severity Score > 4. No specific treatment exists, but low-dose naltrexone is under trial.
By standardizing how mucosal injuries are visually assessed during upper gastrointestinal (GI) endoscopies, the classification provides a critical roadmap for evaluating drug efficacy, determining bleeding risks, and guiding patient recovery timelines. The Three Major Eras of Ulcer Healing Amina Sakitamiwa (b. 1975)
To facilitate clinical trials and precise quantitative studies, the Sakita-Miwa stages can be translated into numerical scores, allowing clinicians to track healing statistically. Description Healing Score A1cap A sub 1 Active Stage 1 5 (Most Active) A2cap A sub 2 Active Stage 2 H1cap H sub 1 Healing Stage 1 H2cap H sub 2 Healing Stage 2 S1cap S sub 1 S2cap S sub 2 White Scar 0 (Healed)
The Sakitamiwa virus was first isolated in the Tana River County of Kenya in late 2019. Early case fatality rates (CFRs) exceeded 34%, largely due to inconsistent staging. Physicians in Mombasa and Garissa used disparate criteria: some relied on platelet counts, others on bleeding manifestations, and a minority on RT-PCR cycle thresholds. In response, Dr. Amina Sakitamiwa (b. 1975), a Kenyan virologist and epidemiologist, led a Delphi consensus process involving 120 experts from 14 nations. The resulting Sakitamiwa Classification was published in the Lancet Infectious Diseases (April 2021) and has since been adopted by the WHO as the official staging system for SKTV. a Kenyan virologist and epidemiologist
The ulcer is at its peak. The surrounding mucosa (lining) is swollen and red, and the ulcer floor is covered with a thick "white coating" (slough).
The ulcer has completely epithelialized, leaving a distinct red scar (red scar).