Understanding our environment matters in the fight against malaria
Malaria is often talked about as a battle between people and mosquitoes. But the reality is more complex. Rainfall, temperature, humidity, seasonal variation, mosquito behaviour and the way people interact with their surroundings can all influence when and where malaria is transmitted.
For World Environmental Health Day on 26 September, scientists from Transmission Zero are highlighting why understanding these relationships matters as Tanzania explores new ways to tackle malaria. For decades, malaria control has included interventions that target mosquitoes and their interaction with people and the environment. Today, scientists are also exploring whether the mosquito itself can be modified to interrupt malaria transmission.
“Malaria is a powerful example of how closely human and environmental health are connected,” says Dr Dickson Wilson Lwetoijera, Programme Director for Transmission Zero at Ifakara Health Institute (IHI). “When we understand the mosquito, the parasite and the environment in which transmission happens, we can develop interventions that are better suited to the places and people they are intended to protect.”
Environmental conditions are an important part of that picture. Rainfall can create suitable mosquito breeding sites, while temperature, humidity and seasonal variation can affect mosquito survival and parasite development. A changing climate may also alter the geographical and seasonal patterns of malaria transmission, reinforcing the need for malaria strategies that can respond to different environments.
Tanzania also has a long history of contributing to vector-control research and innovation, from early research into insecticide-treated bed nets to the successful use of sterile insect technology against tsetse flies in Zanzibar. Today, Tanzanian research institutions continue to contribute to the development and evaluation of approaches ranging from advanced mosquito surveillance to new genetic and vector-control technologies.
Transmission Zero is part of this evolving research landscape. The research programme brings together IHI, the National Institute for Medical Research (NIMR), Imperial College London and the Swiss Tropical and Public Health Institute to investigate genetic approaches that could complement existing malaria interventions. Transmission Zero's approach aims to modify malaria mosquitoes so the malaria parasite cannot develop effectively inside them, reducing their ability to transmit the disease.
“Innovation shouldn't mean choosing between protecting human health and understanding the environment,” adds Dr Lwetoijera. “The responsibility of science is to understand both. That is why studying mosquito populations, their biology, their interaction with changing environments and the possible effects of an intervention is such an important part of the research process.”
This is particularly important when developing new genetic technologies. “Transmission Zero's research follows a stepwise process in which potential effects on people and the environment are assessed as the science progresses. All current research remains under strict laboratory containment in Tanzania,” says Dr. Lwetoijera.
Existing interventions, including insecticide-treated bed nets, medicines and indoor spraying, remain essential. New approaches are being investigated as potential complements that could help address remaining gaps in malaria transmission over the longer term.
“Healthy communities and healthy environments are interconnected. Understanding where mosquitoes breed, how environments influence transmission and what communities can do to reduce risk all form part of malaria prevention. At the same time, science must continue exploring responsible new ways to protect people from this deadly, yet preventable, disease.”
About Transmission Zero
Transmission Zero is an international research programme working to develop innovative genetic tools to help eliminate malaria in Africa. By genetically modifying mosquitoes to block the malaria parasite from being passed to humans, the programme aims to stop malaria transmission at its source. Led by Imperial College London in partnership with the Ifakara Health Institute, the National Institute for Medical Research (Tanzania), and Swiss Tropical and Public Health Institute (Swiss TPH), Transmission Zero is committed to advancing African-led science that is safe, equitable, and designed in close collaboration with communities. The programme is supported by the Bill & Melinda Gates Foundation.
Comments