“South Africa’s diphtheria surveillance figures have increased to 47 confirmed respiratory infections after three additional cases were identified in a Tshwane household, highlighting the importance of disease surveillance, vaccination and early treatment. The Western Cape continues to account for most confirmed infections, while the appearance of additional cases in Gauteng reinforces concerns about transmission and the need for coordinated public-health responses.”
South Africa Diphtheria Cases Rise to 47 as Tshwane Household Cluster Raises Public Health Concerns
South Africa’s national diphtheria surveillance figures have increased to 47 confirmed respiratory cases following the identification of three additional infections in Gauteng, raising renewed concerns about disease transmission, vaccination coverage and the importance of early medical intervention. The latest figures from the National Institute for Communicable Diseases (NICD) highlight the continued presence of the vaccine-preventable disease in the country, with the Western Cape recording the highest number of confirmed infections.
The NICD’s week 44 situational report, published on 6 November 2026, covers the period from 29 December 2025 to 1 November 2026. It records 47 confirmed respiratory diphtheria cases and 11 people carrying toxin-producing Corynebacterium diphtheriae without symptoms. The report also identifies three additional laboratory-confirmed infections and one new asymptomatic carrier in Gauteng.
Tshwane Household Cluster Adds Three Confirmed Cases
The latest increase is associated with a household cluster in Tshwane, Gauteng, where three respiratory diphtheria infections were confirmed. The cluster also includes one person carrying the toxin-producing bacterium without symptoms.
According to the NICD, the infections were recorded during the weeks beginning 19 and 26 October 2026. The development represents the first diphtheria cluster identified in Gauteng during the current reporting period.
The findings underline the importance of household contact tracing and public-health investigations in identifying individuals who may have been exposed to the disease.
Health authorities have initiated appropriate responses for suspected and confirmed cases, including investigations and measures intended to reduce transmission.
Western Cape Remains the Most Affected Province
The Western Cape continues to account for the majority of South Africa’s confirmed respiratory diphtheria infections.
The latest surveillance figures identify 36 confirmed cases in the Western Cape, representing approximately 77% of the national total. Gauteng accounts for six confirmed cases, while Limpopo has recorded five.
The distribution demonstrates that diphtheria transmission remains geographically concentrated, although infections are also being detected in other provinces.
The NICD’s surveillance data indicates that cases have occurred both within identified clusters and among individuals without established epidemiological links.
Between December 2025 and November 2026, eight clusters involving 32 individuals were identified nationally. These included confirmed respiratory cases, probable infections and asymptomatic carriers.
The clusters occurred in Cape Town, Tzaneen and Tshwane, among other locations. Most were associated with households, although one earlier cluster was identified in a correctional facility.
The identification of these clusters demonstrates why contact tracing remains an essential component of infectious disease surveillance.
Understanding Diphtheria and Its Transmission
Diphtheria is an infectious disease caused by toxin-producing strains of Corynebacterium diphtheriae. Respiratory diphtheria primarily affects the throat, tonsils, nose and upper respiratory tract.
The disease can spread through respiratory droplets generated when an infected person coughs or sneezes. Close contact with infected individuals can increase the risk of transmission.
People living in the same household, sharing close social environments or caring for an infected individual may face increased exposure.
The bacterium produces a toxin capable of damaging tissues and organs. In severe cases, the toxin can affect the heart, nervous system and kidneys.
One of the characteristic symptoms of respiratory diphtheria is the development of a greyish-white membrane in the throat. This membrane can interfere with breathing and swallowing.
Other symptoms may include a sore throat, fever, weakness and swollen neck glands.
In severe infections, swelling of the neck can become pronounced, sometimes described medically as a bull neck.
Diphtheria can affect people of different ages. Although childhood vaccination provides important protection, adults may also become susceptible when immunity decreases over time.
Nine Deaths Recorded Among Confirmed and Probable Cases
The NICD report records nine deaths among 52 confirmed and probable respiratory diphtheria cases.
Six deaths were reported in the Western Cape, two in Limpopo and one in Gauteng.
The reported case-fatality ratio among confirmed and probable cases is approximately 17%, demonstrating the potential seriousness of the disease.
These figures highlight the importance of recognising symptoms early and seeking appropriate medical attention.
Diphtheria can become dangerous when treatment is delayed because the toxin may cause serious complications even after the infection has begun affecting the throat.
Medical professionals may need to provide specialised treatment, including diphtheria antitoxin, antibiotics and supportive care.
The NICD emphasises that treatment should not necessarily wait for laboratory confirmation when clinicians strongly suspect diphtheria.
Early intervention can help prevent complications and reduce the risk of death.
Vaccination Remains the Most Important Preventive Measure
Diphtheria is preventable through vaccination.
South Africa’s routine childhood immunisation programme includes vaccines that protect against diphtheria and other serious infectious diseases.
Vaccination helps the immune system develop protection against the toxin responsible for severe disease.
However, protection may decrease over time, making booster doses important.
Parents and caregivers are encouraged to check children’s vaccination records and consult healthcare professionals when doses have been missed.
Adults who are uncertain about their vaccination history can also seek advice from clinics or medical practitioners.
Vaccination programmes are particularly important in communities where infectious diseases can spread rapidly through close contact.
Maintaining high vaccination coverage helps protect individuals while reducing opportunities for transmission.
Public Health Authorities Strengthen Surveillance and Response
The identification of additional infections demonstrates the importance of disease surveillance systems.
The NICD monitors laboratory-confirmed cases, probable infections, carriers and suspected cases across provinces.
Healthcare facilities play an important role by identifying patients with compatible symptoms and ensuring that specimens are collected for laboratory testing.
Contact tracing helps health authorities identify people who may have been exposed to confirmed infections.
These individuals may require medical assessment, preventive treatment or vaccination review, depending on their exposure and clinical circumstances.
The NICD reports that public-health responses were initiated for all suspected and confirmed cases included in its surveillance system.
Such coordinated activities help reduce the likelihood of further transmission.
Laboratory Investigations Provide Important Evidence
Laboratory testing is essential for confirming diphtheria infections and determining whether bacteria produce the toxin responsible for serious disease.
The NICD’s latest report includes laboratory investigations involving bacterial cultures, toxin testing, antibiotic susceptibility and genetic sequencing.
These investigations help researchers understand the characteristics of circulating strains and support treatment decisions.
The report indicates that tested isolates remained susceptible to penicillin and erythromycin under the laboratory testing conditions described.
Genetic sequencing also provides information about relationships between infections and circulating bacterial lineages.
Such information can help epidemiologists investigate possible connections between cases and identify transmission patterns.
However, surveillance figures remain provisional and may change as laboratory records are updated or additional investigations are completed.
Recognising Symptoms and Seeking Medical Attention
Members of the public should remain aware of the symptoms associated with respiratory diphtheria.
These include persistent sore throat, fever, difficulty swallowing, swollen neck glands and the appearance of a greyish-white membrane in the throat.
Anyone experiencing breathing difficulties or severe throat swelling should seek urgent medical attention.
People who have been in close contact with a confirmed case should follow instructions from healthcare professionals and public-health authorities.
Self-treatment with antibiotics is not recommended because suspected diphtheria requires professional assessment and appropriate clinical management.
Healthcare workers can determine whether testing, preventive antibiotics or vaccination assessment is necessary.
Early recognition is particularly important because severe complications can develop rapidly.
South Africa’s Disease Prevention Priorities
The latest diphtheria figures highlight several important public-health priorities.
First, vaccination coverage must remain strong across childhood and adulthood where boosters are indicated.
Second, healthcare facilities need to maintain awareness of diphtheria symptoms so that suspected cases can be recognised promptly.
Third, laboratory surveillance and contact tracing should continue to support the identification of infections and possible transmission pathways.
Fourth, public communication must provide accurate information about symptoms, vaccination and access to healthcare.
Communities also benefit when residents understand that diphtheria is preventable and that seeking treatment early can significantly improve outcomes.
The disease’s continued presence demonstrates that vaccination-preventable infections can return or persist when population immunity is insufficient.
Conclusion
South Africa’s 47 confirmed respiratory diphtheria cases represent an important public-health development, particularly following the identification of three additional infections in a Tshwane household cluster.
The Western Cape remains the most affected province, while Gauteng and Limpopo continue to report infections.
Nine deaths among confirmed and probable respiratory cases demonstrate the seriousness of the disease and the need for early intervention.
Vaccination, surveillance, contact tracing and timely medical treatment remain central to controlling diphtheria transmission.
As health authorities continue monitoring the situation, the public is encouraged to maintain vaccination awareness, recognise symptoms and seek medical care promptly when infection is suspected.
