Human scent ‘key in war on malaria’ - The East African

Human scent ‘key in war on malaria’

Friday August 12 2016

A laboratory technician prepares blood samples from volunteers for viral-genotyping on October 30, 2009 at Ifakara Health Institute in Bagamoyo, Tanzania where a pioneering vaccine against malaria was then in its third phase of testing. PHOTO | TONY KARUMBA | AFP

A laboratory technician prepares blood samples from volunteers for viral-genotyping on October 30, 2009 at Ifakara Health Institute in Bagamoyo, Tanzania where a pioneering vaccine against malaria was then in its third phase of testing. PHOTO | TONY KARUMBA | AFP 

By AFP

Kenyan and Dutch scientists have designed a unique mosquito trap that uses human odour to attract the malaria-carrying insects, helping cut the number of cases dramatically.

A three-year study in Kenya found the special traps baited with synthetic smell helped to catch 70 per cent of the local malaria mosquito population, and led to a 30 per cent drop in cases in households using the devices.

The report was published in the medical journal The Lancet on Wednesday. The research was carried out on Rusinga Island, with the participation of all the 25,000 residents.

“The odour-baited trap may also offer a solution to diseases such as dengue fever and the Zika virus,” Wageningen University in the Netherlands, which led the research, said in a statement.

Both dengue and Zika are caused by parasites carried by a mosquito that is different from the malaria-bearing one, but which is also attracted by human smell.

The trap also reduces the need to rely on pesticides to control mosquitoes, which are becoming increasingly resistant to such chemicals. Using pesticides is also dangerous to agriculture.

'Ultimate dream'

“Beating malaria without using insecticides is my ultimate dream,” said Prof Willem Takken from Wageningen University.

He led the study along with researchers from Kenya’s International Centre of Insect Physiology and Ecology and the Swiss Tropical and Public Health Institute.

The solar-powered traps were laced with human pong and placed either outside or inside homes on the island, in Lake Victoria.

Mosquito nets and anti-malarial drugs were also used to combat the disease.

Since the traps need electricity to work, the researchers installed solar panels on the houses as there is no electricity grid on the island. In an added benefit for the local people, the panels could also power two light bulbs, and charge mobile phones.

“Every minute, a child dies of malaria. This disease costs Africa $12 billion a year” in health care costs and lost production, the Dutch university said.

Malaria is caused by parasites transmitted to people through the bites of infected female mosquitoes.

There is currently no vaccine and some 438,000 people died last year from the disease, according to the World Health Organisation (WHO).

Most of the deaths were among children under the age of five in sub-Saharan Africa.

The WHO is now working towards reducing the number of deaths from malaria by 90 per cent by 2030.