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African Countries Debate Using DDT in
Anti-Malaria Efforts
Some propose using pesticide in tightly
controlled conditions
By
Sanday Chongo Kabange,
VOA
| Lusaka, Zambia
Posted on August 1, 2011
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African children watch a play on malaria prevention at the Mbosse health
clinic.
Photo: VOA - A. Fortier
The chemical pesticide DDT has been
banned by most countries for use in agriculture, but some continue to
use it indoors to kill insects that carry malaria.
In Zambia, it’s an important part of the
government’s malaria control program, and the controlled use of DDT spray
has led to a reduction in malaria cases over the years.
Other African countries are facing a rise
in the number of cases and several African governments are considering the
carefully monitored use of DDT as part of their strategy against the
disease.
In Malawi, for example, the Department of
Health may undertake a DDT spray program in malaria prone-areas.
There is no doubt that DDT is very
effective in killing mosquitoes. The problem lies in what other effects DDT
may have on human health, wildlife, environment, horticulture and crops.
Malawi’s secretary of health, Chris Kang’ombe, was part of a delegation that
visited Zambia to learn how the use of DDT has helped reduce malaria there.
Kang’ombe is convinced that DDT can help
reduce the spread of malaria in Africa -- if handled under controlled
conditions by trained personnel and monitored by government agencies.
He says, “DDT is used for indoor
spraying. It is used to only spray within, inside the house, dwelling
houses. What we have learnt (from Zambia) and we know from our experience
here (in Malawi), the other chemicals [are active for] up to about two or
three months, whereas with DDT you are talking of six months plus. So in
terms of “residue effect,” it (DDT) is better, and also eventually the cost
of indoor spraying…will be much cheaper, more cost effective than using
other chemicals. “
While authorities in Malawi are still
considering using DDT in malaria control, a thorny issue has arisen.
The Tobacco Control Commission is against the idea of using the
pesticide. Tobacco is the mainstay of Malawi’s economy, and there’s
fear that Western consumers will not buy it if there are any traces of
DDT on the crops. So the commission will likely require careful
monitoring if Malawi is to start using DDT in malaria control.
Similar views are shared by Uganda’s Network on Toxic Free Malaria
Control. The network is against the use of DDT as a malaria control
strategy.
“We have no law specifically for DDT,” says Network Secretary General
Ellady Muyambi . “ We have no trained manpower. We do not have equipment
in terms of transportation facilities, in terms of storage facilities, in
terms of disposal facilities, in terms of laboratories for chromatography.
We do not have the capacity. We are still relaying on donor funding and we
are saying why can’t our country use its own resources to deal with its own
problems, especially these ones like malaria.,” says Muyambi.
Also involved in the DDT debate is Kenya, another country debating
whether to use the pesticide.
Shrikant Bhatt professor of medicine at the University of Nairobi in
Kenya explains why the controlled use of DDT should be reintroduced. “We are
almost getting defeated by the pandemic that is occurring due to malaria.
[Anti-malarial] drugs are gaining resistance [to the parasite]. You know we
have very few drugs which we can use as effective means of controlling
malaria. So, I think we do not have any option but to reintroduce DDT in a
limited way, [like] spraying DDT indoors or using it in endemic areas we
should be able to contain the malaria pandemic,” he explains.
The International Centre for Insect Physiology and Ecology (ICIPE), also
based in Kenya, is taking different approach.
John Githure a researcher at the centre says “ICIPE is largely
concentrating on how we can come up with innovative ways or even using
available products to kill the mosquitoes at larval stage. “
One such product uses soil-dwelling bacteria called bacillus
thuringiensis, or BTi.
Githure says ,”we are trying to introduce that in Africa and ICIPE have of
course gone ahead to construct a demonstration factory that will be able to
at least make the product BTi available, affordable and accessible to the
community to use for mosquito control.”
Meanwhile, the government and various organizations including Melinda and
Bill Gates Foundation are encouraging free distribution of
insecticide-treated mosquito nets and sleeping under bed-nets as short term
measure for malaria control.
For VOA Africa...I am Sanday Chongo Kabange in Lusaka, Zambia.
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