Unfortunately, I don’t think we will run out of areas in which to distribute nets. We don’t just distribute nets in easily accessible areas but also in hard and very hard to get to areas as it is important to protect everybody and achieve ‘universal coverage’ i.e. all sleeping spaces covered. Often the hardest to reach areas are those that most need nets as they have more challenging access to health care. There are many examples of hard to reach areas in DRC, one of the two countries in the world most affected by malaria, and in Papua New Guinea where geography is particularly challenging, but most countries, regions and districts have areas that are tough to get to and require extra effort.
The insecticide lasts for more than three years, the typical mechanical lifetime of the net. BTW, the long-lasting in ‘long-lasting insecticidal net’ (LLIN) refers to the insecticide. In some of the next generation nets we are looking at and working with, that typically have a second (safe for humans) chemical on them to enable the net to be more effective at dealing those mosquitoes species that may be developing a resistance to the (pyrethroid) insecticide on the net, we are monitoring carefully how long the ‘active ingredients’ as they called, last.
You may be interested to know that a net remains effective not just because of the longevity of the insecticide, but also because the insecticide is ‘bio-available’ i.e. it is on the surface of the nets and is available for the mosquitoes to pick it up via their feet. The insecticide is held on the net by a binding agent and the agent has to achieve the balance of keeping the insecticide from evaporating (too quickly) but also allowing it to be released. In some net manufacturing processes, the insecticide actually ‘sweats out’ of the filaments that make up the net. As a result, the humble $2 bednet is in fact quite an amazingly well engineered and chemically engineered product.
We do already go back to the same areas and distribute nets because of the three year lifetime of the net. The global approach to bednet distributions is that they take place in an area every three years. In fact, we would suggest the lifetime (on average, for a large cohort of nets) is closer to two and a half years and we are looking at repeat distributions with this frequency in some areas in order to ensure the populations in these malarious areas are continually covered. How long a net lasts depends on its environment (a net in a thatched dwelling is not likely to last as long as one in a brick house) and how it is treated.
Unfortunately, I don’t think we will run out of areas in which to distribute nets. We don’t just distribute nets in easily accessible areas but also in hard and very hard to get to areas as it is important to protect everybody and achieve ‘universal coverage’ i.e. all sleeping spaces covered. Often the hardest to reach areas are those that most need nets as they have more challenging access to health care. There are many examples of hard to reach areas in DRC, one of the two countries in the world most affected by malaria, and in Papua New Guinea where geography is particularly challenging, but most countries, regions and districts have areas that are tough to get to and require extra effort.
The insecticide lasts for more than three years, the typical mechanical lifetime of the net. BTW, the long-lasting in ‘long-lasting insecticidal net’ (LLIN) refers to the insecticide. In some of the next generation nets we are looking at and working with, that typically have a second (safe for humans) chemical on them to enable the net to be more effective at dealing those mosquitoes species that may be developing a resistance to the (pyrethroid) insecticide on the net, we are monitoring carefully how long the ‘active ingredients’ as they called, last.
You may be interested to know that a net remains effective not just because of the longevity of the insecticide, but also because the insecticide is ‘bio-available’ i.e. it is on the surface of the nets and is available for the mosquitoes to pick it up via their feet. The insecticide is held on the net by a binding agent and the agent has to achieve the balance of keeping the insecticide from evaporating (too quickly) but also allowing it to be released. In some net manufacturing processes, the insecticide actually ‘sweats out’ of the filaments that make up the net. As a result, the humble $2 bednet is in fact quite an amazingly well engineered and chemically engineered product.
We do already go back to the same areas and distribute nets because of the three year lifetime of the net. The global approach to bednet distributions is that they take place in an area every three years. In fact, we would suggest the lifetime (on average, for a large cohort of nets) is closer to two and a half years and we are looking at repeat distributions with this frequency in some areas in order to ensure the populations in these malarious areas are continually covered. How long a net lasts depends on its environment (a net in a thatched dwelling is not likely to last as long as one in a brick house) and how it is treated.