AVRU's snakebite ambulance parked in front of a rural health centre in Papua New Guinea. Photograph by Diana Barr (AVRU).
Papua New Guinea (PNG) has one of the highest localised snakebite rates in the world. In some parts of PNG, snakebite mortality rates can be three times higher than those from more notorious diseases such as malaria or tuberculosis. In southern PNG, Papuan taipan snakes (Oxyuranus scutellatus) cause more than 90% of all cases of “envenoming” (venom-induced injury) admitted to Port Moresby General Hospital. This single cause of injury accounts for 60% of all ventilator bed-days in the hospital’s intensive care unit (ICU). Up to 63% of snakebite victims in PNG are less than 25 years of age and nearly half of all fatalities involve children. Injuries suffered include spontaneous bleeding, irreversible paralysis, and sometimes muscle damage, heart rhythm problems and acute kidney injury. Despite these dire statistics, snakebite is a treatable disease, and early administration of effective antivenom can be life-saving. Snake antivenoms have been used in Australia and PNG for more than 70 years, but the very high cost (~US$1,500 vial) of current products limits access to these essential medicines in PNG, resulting in chronic shortages and supply failures. Since 2004 the University of Melbourne, in partnership with the University of Papua New Guinea (UPNG) and Port Moresby General Hospital has sought to address the problem of snakebite in PNG.
Our PNG Snakebite Research Project (PNG-SRP) provides us with a unique capacity to undertake clinical investigations of snakebite envenoming that generate insight into the complexity of the pathologies caused by bites from Australo-Papuan venomous snakes such as taipans (Oxyuranus scutellatus), death adders (Acanthophis spp.) and brown snakes (Pseudonaja textilis) and the challenges and rewards of evidence-based clinical management using antivenoms and supportive care.
This project operates the only single-centre clinical envenoming research facility in Australasia. Our snakebite clinic at Port Moresby General Hospital treats between 350-400 cases of snakebite each year. Whilst the primary motivation of this work is to save lives, the abundance of envenomations creates an ideal environment in which to recruit adequate numbers of cases to undertake investigations of clinical syndromes of envenoming that can inform the treatment of snakebite not just in Papua New Guinea, but also in the neighbouring Indonesian Papua Province and Australia. In addition, we operate a laboratory and serpentarium (the Charles Campbell Toxinology Centre; CCTC) at the School of Medicine and Health Sciences within the University of Papua New Guinea where we conduct basic venom, snake biogeography, epidemiological and clinical laboratory research projects. We train UPNG undergraduate and postgraduate students, including doctors completing their Master of Medicine projects.
Our approach is to employ a multidisciplinary approach that embraces research, public education, health worker training, and improved treatment of envenomed patients. The primary goals are to reduce the number of deaths due to snakebite, and to improve overall patient care so that mortality and morbidity are reduced and victims of accidental envenomation are able to resume their normal lives. To achieve these goals, we aim to:
- build local scientific and medical infrastructure and capacity;
- educate and train future leaders in science, technology and medicine;
- improve access to safe, affordable and life-saving antivenoms;
- remove gaps in our knowledge of snakebite and its treatment in PNG;
- translate our findings into best practice to save lives; and
- ensure program sustainability long into the future.
Improving Antivenom Access: Our major achievement to date has been the collaborative development of a new antivenom for use in the treatment of Papuan taipan envenoming. Supplied at a cost of approximately US$300/vial, the new antivenom will substantially reduce current treatment costs, thus improving the availability of the only effective treatment for snakebite and improving patient outcomes. Phase I clinical trials were completed in 2014, and a larger Phase II clinical trial was completed in 2016. Publication of the results of both of these studies is scheduled for Q3 and Q4 of 2017 respectively.