Diphtheria, a once-devastating disease, has made a resurgence in Australia, posing a stark reminder of the importance of vaccination. This article delves into the recent outbreaks, the reasons behind their occurrence, and the critical role of vaccination in preventing this preventable disease.
A Historical Perspective
Diphtheria, a disease that once claimed the lives of thousands in Australia, particularly among children, has been largely eradicated thanks to the advent of vaccines. The 1930s marked the beginning of widespread vaccination, and by the 1950s, the disease was nearly eradicated. However, the COVID-19 pandemic has disrupted this progress, leading to a concerning decline in vaccine coverage.
The Resurgence of Diphtheria
The Northern Territory and Western Australia have been hit particularly hard, with outbreaks of both respiratory and cutaneous diphtheria. The NT recorded 17 cases of respiratory diphtheria and 60 cases of cutaneous diphtheria in the past year, while Western Australia reported 27 cases in the Kimberley region alone in the past month, with a quarter of them being respiratory infections. Cases have also been found in Queensland and South Australia, highlighting the disease's resurgence across the country.
Understanding Diphtheria
Diphtheria is caused by the toxin produced by the bacteria Corynebacterium diphtheriae or Corynebacterium ulcerans. It spreads through respiratory droplets or direct contact with infected skin sores. Respiratory diphtheria initially presents with fever, sore throat, and general malaise, but can progress to a grey-white membrane forming over the throat, making swallowing and breathing difficult. Cutaneous diphtheria, while less severe, can lead to chronic skin ulcers that won't heal, serving as a source of bacteria that can spread to un-immunized individuals.
Treatment and Prevention
Prompt treatment with antibiotics is crucial for both forms of diphtheria, but the diphtheria antitoxin, essential for neutralizing circulating toxin, is not readily available due to a global decline in cases and decreased production. Despite treatment, respiratory diphtheria can still result in death in up to 10% of cases.
Vaccination remains the most effective prevention method. Diphtheria vaccines, administered as part of the DTP (diphtheria, tetanus, and pertussis) combined vaccine, stimulate the production of antibodies that protect against the diphtheria toxin. Routine vaccinations for children and adults, as well as targeted campaigns during outbreaks, are vital to maintaining immunity.
The Decline in Vaccine Coverage
The decline in vaccine coverage is attributed to various factors, including practical challenges like time and travel constraints, and concerns, beliefs, and social influences affecting vaccine acceptance. The pandemic has exacerbated these issues, with a rise in vaccine hesitancy and a lack of trust in healthcare provider information.
Addressing the Decline
To reverse the decline in vaccine coverage, efforts should focus on making appointments more accessible and fostering supportive conversations about vaccines with healthcare professionals. However, parents report limited opportunities for these discussions, with short consultations and high out-of-pocket costs. Investing in primary care, including funding models for longer vaccine discussions and training in empathetic communication, is essential to rebuilding trust and confidence in vaccination.
Takeaway
The resurgence of diphtheria in Australia serves as a stark reminder of the ongoing need for vaccination. By addressing the barriers to vaccine access and fostering a culture of trust and education, we can prevent further outbreaks and protect vulnerable populations from this preventable disease.
