"Such largess is unusual — and not a sustainable pathway for vector control research," said John Grieco, a professor of biological sciences at the University of Notre Dame who coordinates the multicountry spatial repellent trial, which is also running in countries including Mali and Sri Lanka. The spatial repellents and most other new tools are commodities: items that have to be bought, then bought again six months or a year later. The protection they offer is temporary, as is the funding that allows for their purchase.