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Bite prevention tools significantly protect against landing in Cambodia field trial 17th May 2022

Recent entomological field results from Project BITE under IVCC’s Indo-Pacific Initiative (IPI) have shown that forest packs containing bite prevention tools offer significant protection from landing mosquitoes. The results come from trials that UCSF-MEI, IVCC’s lead partner on BITE, conducted in Mondulkiri province, Cambodia, with the local non-profit Health Forefront Organization.

The entomological trials were conducted in an area directly adjacent to forest and was comprised of 7 temporary shelters designed to mimic short-term dwellings used by people when working or travelling in the forest. Inside each shelter, one of the bite prevention tools, or a combination of all tools, or a control, were used while volunteers collected mosquitoes via Human Landing Catches (HLC) over a 12-hour period.

Over 49 nights of collections, the entomological field study demonstrated that all products – both on their own and in combination – are highly efficacious at preventing mosquitoes from landing. In fact, all products and combinations reduced mosquito landings by at least 60% compared to the control, while the spatial repellent alone and the combination of all products reduced landings by approximately 95%.

Project BITE aims to evaluate the effectiveness of forest packs containing a spatial emanator, topical repellent, and insecticide-treated clothing when deployed to forest dwellers, goers, and rangers in the Greater Mekong Subregion (GMS). Semi-field trials completed in Thailand in 2021 demonstrated that bite prevention tools not only prevent mosquitoes from landing but can also kill and delay host-seeking.

Following the entomological field studies, Project BITE is currently planning on how best to scale-up use of these tools and further evaluate their epidemiological impact, acceptability, use and cost-effectiveness among high-risk forest-exposed populations.

IVCC and its partners are hopeful that the evidence generated by BITE will help make the case to national programmes and donors on the effectiveness of bite prevention tools delivered in forest packs in the fight against outdoor malaria transmission.

Mitsui’s VECTRON™ T500 under assessment by WHO-PQT/VCP 1st April 2022

IVCC would like to congratulate MCAG on the news that their application (P-03226) has been submitted to the WHO-PQT/VCP for the assessment of its new Indoor Residual Spray product, VECTRON™ T500.

This proposed new vector control product contains the world’s first meta-diamide insecticide, TENEBENAL™ (ISO common name: broflanilide)  Discovered by MCAG, TENEBENAL™ belongs to Group 30 (GABA-gated chloride channel allosteric modulators) in the IRAC classification.  With its new mode of action, it will be an important addition to the vector control toolbox for IRS and can be used in rotation with other IRS products for insecticide resistance management.

In laboratory trials conducted at the Liverpool School of Tropical Medicine[1], and in experimental hut studies supported by IVCC in Burkina Faso, Benin[2] and Tanzania[3], the application of VECTRON™ T500 at 100 mg a.i./m2 demonstrated good residual efficacy for six months or more against susceptible and resistant mosquito strains on mud and other wall surfaces.

[1] Lees, R.S. et al. TENEBENAL™: a meta-diamide with potential for use as a novel mode of action insecticide for public health. Malar J 19, 398 (2020).

[2] Ngufor, C. et al. Efficacy of broflanilide (VECTRON™ T500), a new meta-diamide insecticide, for indoor residual spraying against pyrethroid-resistant malaria vectors. Sci Rep 11, 7976 (2021).

[3] Snetselaar J., et al. Efficacy of indoor residual spraying with broflanilide (TENEBENAL™), a novel meta-diamide insecticide, against pyrethroid-resistant anopheline vectors in northern Tanzania: An experimental hut trial. PLoS ONE 16(3) (2021).

Dual active ingredient bed net demonstrates 44% reduction in malaria incidence in trial 25th March 2022

News Release

Date Issued: 25 March 2022

IVCC welcomes the publication in The Lancet of the 24-month results of an epidemiological trial in Tanzania, conducted by the London School of Hygiene and Tropical Medicine (LSHTM) in partnership with the National Institute for Medical Research, Kilimanjaro Christian Medical University College, and the University of Ottawa, to assess the public health value of two dual active ingredient nets compared to standard LLINs containing pyrethroids only.

BASF’s, dual active ingredient net, Interceptor® G2 demonstrated a significant reduction in malaria prevalence compared to a pyrethroid only net, with an overall 44% reduction in malaria incidence in children 6 months to 10 years.  In the RoyalGuard® net study arm, while no effect was seen on incidence, there was an indication that the RoyalGuard® net reduced prevalence, although not statistically significant in the Tanzania study.

Nick Hamon, CEO of IVCC added: “Our collaboration with BASF on Interceptor® G2 goes back many years so we are delighted to see that our investment in early product development support/field testing, and the continued support of our funding partners, has helped deliver such impactful data.  These results are a significant milestone in establishing the necessary evidence base needed to support an appropriate policy recommendation, and to make dual active ingredient nets a sustainable choice for countries looking for the best value for money in controlling malaria.”

Dr Keziah Malm, Programme Manager, National Malaria Control Programme, Ghana Health Service said: “Having access to innovative tools to support insecticide resistance management is critical for countries like Ghana in the fight against malaria. Ghana’s decision to deploy dual active ingredient nets as a pilot was based on our belief that these nets will help us address some of the challenges we were facing with the standard nets. I am very happy to know the study published in the Lancet has shown this: that there can be a significant impact on reducing malaria prevalence with these dual active ingredients nets compared to the standard insecticide-treated nets. I genuinely hope that all stakeholders will put in the needed efforts to get these effective tools deployed to those who need them.”

Dr Philippe Duneton, Executive Director of Unitaid said: “We need better tools to combat mosquito resistance, a growing challenge in the fight against malaria in Africa. The strong performance of the new Interceptor® G2 bed nets in Tanzania is a tremendous step forward, and we are hopeful that these findings, together with research Unitaid is co-funding through the New Nets Project, will bring a powerful new tool to the malaria fight.”

Peter Sands, Executive Director of the Global Fund added: “The strong performance of these innovative insecticide-treated nets is a timely and promising breakthrough which speaks to the power of what public and private partners can achieve when they join forces. As disruptions to malaria services caused by COVID-19 have led to an alarming increase in malaria deaths and cases, these new nets, with other core malaria prevention tools like seasonal malaria chemoprevention, have the potential to help us protect people more effectively, reverse the negative trend and get back on track towards ending malaria by 2030.”

Helen Jamet, Deputy Director, Vector Control, Malaria at the Bill & Melinda Gates Foundation said: “The study results offer new evidence that we can save more children from malaria and help drive down malaria cases by giving countries additional and more effective tools, like the dual-insecticide Interceptor® G2 net, and targeting them where they’re needed most. This also is critical because introducing new tools can help extend the effectiveness of insecticide-treated nets as a category, which prevented 68% of malaria cases in sub-Saharan Africa between 2000-2015.

The results also serve as the latest example of how long-term and innovative public-private partnerships in R&D and financing can deliver high-impact, cost-effective—and in this case, cost-saving—options that are responsive to the needs of endemic countries at a district-by-district level. By using real-time data and improved surveillance to better target the use of new and existing tools and continuing investment in research and development, countries can stay ahead of growing resistance and rapidly drive down malaria cases and deaths to accelerate progress toward eradication.”

UK-based social finance company MedAccess is supporting access to Interceptor® G2 nets in 14 African countries. The company’s volume guarantee has enabled BASF to reduce the price procurers pay for the nets.

Michael Anderson, CEO of MedAccess, said: “These remarkable results from Tanzania are tremendously exciting for everyone who wants to reduce malaria’s burden in Africa. Interceptor® G2’s lifesaving impact, combined with impressive cost-effectiveness data, is a testament to years of partnership to develop, test and implement this effective new tool. We eagerly await the results from the Benin study, which we hope will lead to a WHO recommendation for wider Interceptor® G2 use in Africa.”

24-month data from a second trial in Benin, delivered through the IVCC led New Net Project (NNP), funded by Unitaid and the Global Fund, started one year after the trial in Tanzania, and is expected to be available for WHO review in mid-2022. Both studies will report additional data once the 36-month period is reached and, combined with New Net Pilot evidence pilots across 5 countries, will contribute to the understanding of both Interceptor® G2 and RoyalGuard’s® product performance over time, across various endemicities and resistance profile.

——ends——-

For further information contact:

Chris Larkin, Director of Communications & Operations

www.christoher.larkin@ivcc.com

(+44) 07712 402498

Product and Project information

Interceptor® G2

Interceptor® G2 is a second-generation ITN developed by BASF with a combination of chlorfenapyr and alpha-cypermethrin to control insecticide resistant mosquitoes. This novel mode of action in vector control exploits mosquito enzymatic systems against themselves and shows no cross-resistance to other insecticide classes. Unlike pyrethroids, the chlorfenapyr target site of activity is not the insect nervous system. Instead, chlorfenapyr acts, after being metabolized by P450 enzymes at the cellular level, by disrupting respiratory pathways and proton gradients through the uncoupling of oxidative phosphorylation within the mitochondria. The Interceptor® G2 net has a WHO prequalification listing. https://www.who.int/pq-vector-control/prequalified-lists/interceptor_g2/en/  Previously the net was evaluated and given an interim recommendation by the 20th WHOPES Working Group.

Royal Guard®

Royal Guard® is an ITN developed by Disease Control Technologies to provide vector control through both the personal protection of traditional mosquito knockdown and mortality, as well as a reduction in fecundity of any mosquitoes that manage to survive exposure to the products pyrethroid active ingredient. The intended benefit of the insect growth regulator, pyriproxyfen, is to reduce the fecundity of adult female mosquitoes and, therefore, yield an overall reduction in the vector population by inhibiting egg laying, larval-pupal transformation and the emergence of functioning young adult mosquitos. The Royal Guard® net has a WHO prequalification listing. https://www.who.int/pq-vector-control/prequalified-lists/RoyalGuard/en/

The New Nets Project (NNP)

The Global Fund and Unitaid are each investing US$33 million between 2018 to 2022 to introduce new insecticide-treated nets to fight malaria-carrying mosquitoes. The New Nets Project is working to build the evidence base around, and prime the market for, the next generation of nets, which are treated with two different types of insecticide to help improve control of mosquitoes.

The project will generate evidence on the efficacy and cost-effectiveness of the new dual insecticide nets to inform a WHO policy decision on dual-AI nets and guide decision-making around product procurement at the country level. It is expected that the New Nets Project – with its unique design of parallel collection of epidemiological data and cost-effectiveness studies – will significantly reduce the timeline for entry of the new nets into the market.

The U.S. President’s Malaria Initiative and the Bill & Melinda Gates Foundation are key operational and financial partners. A coalition led by IVCC is implementing the project which includes The Alliance for Malaria Prevention, Imperial College London, The Liverpool School of Tropical Medicine, PATH, PSI and Tulane University

IVCC

IVCC is the only Product Development Partnership (PDP) working in vector control. IVCC was established in 2005, through an initial $50million grant to the Liverpool School of Tropical Medicine (LSTM) from the Bill & Melinda Gates Foundation and has since provided ongoing support for IVCC activities.  As a registered charity in the UK, IVCC is also funded by UK Aid, USAID and the Swiss Agency for Development and Cooperation to work with stakeholders to facilitate the development of novel and improved public health insecticides and formulations to combat the rapidly growing problem of insecticide resistance.  In addition, IVCC is also funded by Unitaid and the Global Fund to implement catalytic market access projects, such as NgenIRS and the New Nets Project which support the rapid and scaled deployment of innovative vector control interventions.  IVCC brings together partners from industry, the public sector and academia to create new solutions to prevent disease transmission. By focusing resources and targeting practical scientific solutions we accelerate the process from innovation to impact.

Featured image: Women with mosquito net. Busolwa village, Misungwi, credit: Natacha Protopopoff.

Tech Update Winter 2022 18th March 2022

Download the Tech Updates highlighting vector biology and control news, publications and resources.

Any views expressed in the updates do not necessarily reflect the views or opinions of IVCC. In many cases, we directly quote sections of published work. Mention of trade names or commercial products is solely for the purpose of providing specific information and does not imply recommendation or endorsement by IVCC or its funders.

Large Scale Epidemiological studies begin for Attractive Targeted Sugar Baits (ATSB®) 9th February 2022

ATSB® project partners* are pleased to announce that the first of three large scale epidemiological studies have begun to support the opening of a new product class for vector control interventions which address the growing problem of outdoor biting mosquitoes.

Zambia was the first country to start this trial in November 2021 with more than 40,000 bait stations deployed in 35 clusters. A total of 2,450 children aged 1 to 14 years old are enrolled in this study which is expected to last two years.

Two similar studies will be conducted in Kenya and Mali starting in March and April 2022 which together with entomological, social science and cost-effectiveness analysis will constitute the data package which will be submitted to WHO to open the new product class and to regulatory authorities to seek approval for market deployment in sub-Saharan countries.

This is a major achievement following a decade of research and product development. In 2016 and 2017 large-scale proof-of-concept studies were conducted in Mali[1], which demonstrated a significant impact on mosquito density and survival. Since then, a manufacturing platform was established to produce enough ATSB® stations with an agreed specification and quality. Modelling based on preliminary results anticipates that a 2-3% daily feeding rate on ATSB® would lead to a 30% decrease in malaria incidence.

A large campaign of entomological trials was subsequently performed in Zambia, Kenya and Mali in 2020 and 2021 to assess daily feeding rates across diverse ecological settings and to confirm the ATSB bait station resilience when deployed in real field conditions, for example, when, exposed to rain, dust, wind and temperature variations.

The Bill & Melinda Gates Foundation, UK Aid and the Swiss Agency for Development and Cooperation (SDC) are co-funding the entomological and epidemiological impact evaluation of this new vector control tool.

How ATSB works

A significant trend that has emerged in recent years is the growing incidence of outdoor biting.  Mosquitoes are evolving, leading to biting earlier in the evening before people enter their houses to sleep under bed nets or biting after sunrise.  Changes in species composition and behaviour have also been observed towards the dominance of outdoor biting and resting species. This trend is also being exacerbated by changes in human behaviour, with more time being spent outside structures particularly early evening when vulnerable to outdoor biting, often driven by increased accessibility to electricity.

Female mosquitoes take blood meals for egg production, but mosquitoes from both genders must feed regularly and frequently on sugar for energy to survive. Common sources of sugar meals include plant tissue and floral nectar. Two ATSB® bait stations are placed on exterior walls of houses and lures the mosquitoes with an attractant which contains a sugar source laced with an insecticide.

Whilst vector control tools such as bed nets and indoor residual sprays have traditionally targeted indoor biting mosquitoes, there remains a significant gap in the malaria eradication toolbox for outdoor biting interventions.  ATSB®s have the potential to fill this important gap.

Note to Editors:

* Project partners are: Westham Co, IVCC, PATH, Liverpool School of Tropical Medicine, University of Science, Technique and Technology of Bamako.

[1] https://malariajournal.biomedcentral.com/articles/10.1186/s12936-020-3132-0

Featured image: ATSB station secured on the exterior wall of a structure. Credit PATH.

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