A study by Swedish University of Agricultural Sciences
and Addis Ababa University, reported in the open access Malaria Journal,
has shown that malaria-transmitting mosquitoes actively avoid feeding on
certain animal species such as chickens, using their sense of smell. The
scientists say odours emitted by species such as chickens could provide
protection for humans at risk of mosquito-transmitted diseases.
To find out which species the mosquitoes prefer, the
research team collected data on the population of human and domestic animals in
three Ethiopian villages. They also collected blood-fed mosquitoes to test for
the source of the blood that the mosquitoes had fed on. People living in the
areas in which the research was conducted share their living quarters with
their livestock. The researchers found that while Anopheles arabiensis strongly
prefers human over animal blood when seeking hosts indoors, it randomly feeds
on cattle, goats and sheep when outdoors, but avoids chickens in both settings,
despite their relatively high abundance.
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