Noma

Noma
Name	Noma
Synonyms	Cancrum oris, gangrenous stomatitis
Field	Infectious disease, dentistry
Symptoms	Facial swelling, ulcers, tissue necrosis
Complications	Severe facial disfigurement, trismus, malnutrition
Onset	Rapid
Causes	Polymicrobial infection, often following illness
Risks	Malnutrition, poverty, poor sanitation, HIV/AIDS, malaria, measles
Diagnosis	Based on clinical appearance
Differential	Necrotizing fasciitis, cutaneous leishmaniasis, syphilis
Prevention	Improved nutrition, sanitation, vaccination
Treatment	Antibiotics, wound care, surgery, nutritional support
Medication	Penicillin, metronidazole
Prognosis	High mortality if untreated
Frequency	Estimated 140,000 new cases annually
Deaths	Estimated 90% mortality without treatment

Noma. It is a severe, rapidly progressive gangrenous infection that primarily affects the face, starting in the mouth and destroying soft and hard tissues. The disease predominantly strikes young children living in conditions of extreme poverty and is almost entirely preventable. Its devastating progression leads to severe disfigurement, significant functional impairment, and high mortality if not treated early.

Overview

Noma, also known as cancrum oris, is a type of necrotizing disease that causes orofacial gangrene. Historically documented in concentration camps during World War II, such as Auschwitz, it is now almost exclusively found in regions of sub-Saharan Africa, often referred to as the "noma belt." The condition is considered a neglected tropical disease by the World Health Organization and is a marker of profound social inequity. The pathognomonic feature is its rapid destruction of facial structures, often within weeks, leaving survivors with life-altering sequelae.

Causes and risk factors

The exact etiology is polymicrobial, involving a combination of commensal bacteria in the oral cavity, such as Fusobacterium necrophorum and Prevotella intermedia, that become pathogenic. A critical predisposing factor is a preceding illness—commonly measles, malaria, or HIV/AIDS—that weakens the host's immune system. The primary risk factor is severe malnutrition, particularly deficiencies in vitamin A, B vitamins, and protein. These factors are compounded by conditions of extreme poverty, lack of access to clean water and sanitation, and poor oral hygiene, creating a perfect environment for the disease to initiate.

Clinical features and diagnosis

The disease typically begins with inflammation of the gums (acute necrotizing gingivitis) before rapidly progressing through stages of edema, ulceration, gangrene, and scarring. A hallmark is a foul-smelling oral ulcer that spreads outward, causing blackening and necrosis of the cheeks, lips, or nose. Diagnosis is primarily clinical, based on this characteristic appearance in a high-risk patient. Differential diagnoses include other destructive conditions like necrotizing fasciitis, cutaneous leishmaniasis, or tertiary syphilis. In later stages, complications such as trismus (lockjaw), aspiration pneumonia, and severe facial disfigurement are common.

Treatment and management

Early intervention is critical and can halt progression. Initial treatment involves high-dose systemic antibiotics, typically penicillin and metronidazole, alongside intensive nutritional rehabilitation. Supportive care includes wound care, pain management, and treatment of any concurrent infections like malaria. For survivors with tissue loss, complex reconstructive surgery, often performed by organizations like Médecins Sans Frontières or the Noma Children's Hospital in Sokoto, is required to restore function and appearance. This surgery can involve techniques like microsurgery and the use of pedicled flaps.

Epidemiology

Noma occurs predominantly in children between the ages of 2 and 6 years living in impoverished regions of sub-Saharan Africa, including Nigeria, Niger, and Senegal. The World Health Organization estimates approximately 140,000 new cases each year, with a case-fatality rate as high as 90% without treatment. True incidence is difficult to ascertain due to underreporting, high mortality in remote communities, and stigma. Outbreaks are often associated with periods of famine or humanitarian crises, as seen historically in Biafra and reported in refugee camps.

Prevention and public health

Prevention is achievable through addressing its underlying social determinants. Key measures include promoting exclusive breastfeeding, improving access to nutritious food, and ensuring widespread vaccination against diseases like measles. Improving access to clean water, sanitation, and basic healthcare is fundamental. Public health initiatives led by the World Health Organization and NGOs focus on community-based surveillance for early detection and integrating noma care into primary health systems. Raising global awareness is essential to mobilize resources and eliminate this disease of poverty.

Category:Neglected tropical diseases Category:Oral and maxillofacial pathology Category:Infectious diseases