When a person hears about rabies, it’s often not thought of as an immediate personal threat. But rabies kills about 60,000 people every year – the majority of deaths are in Africa and Asia.
Rabies is a viral disease transmitted to humans through bites from rabid animals. The virus infects the central nervous system ending in the brain, at which point death is inevitable.
This year several major international organisations have, for the second year in a row, endorsed the global goal of elimination of human deaths from dog rabies by 2030. It also marks three years since Kenya launched a strategic plan that would progressively reduce human deaths due to dog rabies to make the country rabies free by 2030.
For Kenya, the focus on rabies was informed by results of an exercise that mapped diseases in the country. It placed rabies as one of top five animal diseases that affect people in the country. Rabies is estimated to kill 2,000 people every year in Kenya.
I was involved in drafting Kenya’s strategy for the elimination of dog-mediated human rabies. I have also been actively involved in its implementation in pilot areas. The strategy is quite straight forward: vaccinate 70% of dogs annually (the level needed to break the dog-dog transmission cycle), provide prompt post-exposure vaccines to people bitten by suspected rabid dogs, and execute a public education and awareness campaign.
Effective vaccines against dog rabies are available in Kenya. But there are several challenges associated with vaccinating dogs.
The first important metric is determining the size of the dog population in the country. Data doesn’t exist. The country did a livestock census as part of a population census in 2009, dogs were left out. The country now has the opportunity to capture the data during the 2019 population census.
We use cross-sectional household surveys to determine the human:dog ratio which allows us in turn to estimate the dog population. On average, across most of Africa the human:dog ratio estimate is 8:1 in rural areas and higher in urban areas. Kenya, which has a population of 48 million people, is estimated to have a dog population of 6 million. To meet the 70% target, this means that 4.2 million dogs needed to be vaccinated consistently to achieve rabies elimination.
Our experience in the pilot areas shows that there are two critical elements to success: the first is that people need to buy into the effort, and secondly that local government needs to provide resources to vaccinate the dogs and provide post-exposure treatment.
Makueni County, where elimination activities started, has put in its own resources and organised vaccination campaigns that reaches 60% of its dog population.
What we have learnt is that dog owners will bring in their adult animals, but likely to leave puppies behind. We also learnt that successful campaigns require innovations such as mapping vaccination points as well as rapid analysis of data to avoid leaving geographical pockets of unvaccinated dogs because if they are large enough they allow the virus to continue circulating.
Recent reports suggesting that rabies vaccines remains viable after exposure to elevated temperature, presents opportunities to lower the cost of delivery and reach dogs in remote areas, where maintaining the cold chain is challenging.
Bite victims from rabid dogs are protected from infection if they get post-exposure vaccines promptly. For a disease that poorly competes with other health priorities such as malaria, the availability of rabies vaccines as well as their high cost increases the risk of rabies deaths.
In Kenya, we find that in the absence of surveillance data that reports the number of people bitten, the number of rabies positive dogs, or confirmed human deaths due to rabies, the health care system will rarely prioritise provision of these life-saving vaccines.
By providing data we have found that health system administrators are able to predict demand for human rabies vaccines. It also means that they are able to make a stronger case to their local governments to spend money on rabies vaccines.
Nevertheless, the cost of the vaccines is high. International players could help by reducing the cost of purchase and delivery of human vaccines. At a local level, broader health solutions, including universal health coverage, would play a part in ending human rabies deaths.
Public awareness and education on rabies
But awareness and knowledge about rabies at a local level is key. This can help prevent bites and encourage people to get post exposure treatment.
The Philippines has included rabies education in school curricula of rabies, reaching children who are at the highest risk of rabies.
Kenya is taking steps to increase public awareness through a website, on Facebook and Twitter as well as media adverts and talks on rabies prevention and control. This year, for the first time, the 2017 World Rabies Day will be celebrated with a 10km run for rabies in the city of Kisumu accompanied by dog vaccination campaigns in the county. These activities provide opportunities to engage with the public and pass rabies prevention messages.
Ultimately rabies elimination will be achieved through mass community action and a concerted effort by government to provide dog and human vaccines. Every death from rabies is vaccine preventable and failure to prevent it, is a public health failure. The 2030 goal is a commitment to end human suffering from a disease that can be stopped and eliminated.