Irrigating vegetables with wastewater may spread disease
summary：Urban farmers growing vegetables to feed the millions of people in Africa's ever-growing cities could unwittingly be helping to spread disease by irrigating crops with wastewater, a new study reveals....
Urban farmers growing vegetables to feed the millions of people in Africa's ever-growing cities could unwittingly be helping to spread disease by irrigating crops with wastewater, a new study reveals.
Experts discovered that wastewater collected from canals used for urban agriculture in Burkina Faso was rich in virulent human pathogens which cause gastroenteritis and diarrhoea -- a major cause of death in low and middle-income countries.
Researchers at the University of Birmingham led an international team from Burkina Faso, Cameroon and Germany in studying wastewater samples from three canals in the capital Ouagadougou, a city of 2.2 million inhabitants.
After identifying a wide range of antibiotic resistance genes in the water, they concluded that using wastewater for urban agriculture in the city posed a high risk of spreading bacteria and antimicrobial resistance among humans and animals.
With the urban population in sub-Saharan Africa expected to rise from 400 million (2010) to 1.26 billion in 2050, according to UN estimates, agriculture in towns and cities is recognised as a vital way of contributing to food security and alleviating poverty.
Sciencedaily.com quoted professor Laura Piddock, from the University of Birmingham's Institute of Microbiology and Infection, as saying: "Using wastewater for agricultural irrigation represents a very serious health risk, not least as it increases exposure to faecal pathogens. Wastewater appears to be a 'hot spot' for antibiotic resistant bacteria in Burkina Faso. We urgently need further investigations to determine the extent that exposed populations are affected by this health issue."