Water Sanitation Health

Bacillus thuringiensis israelensis

Rolling revision of the WHO Guidelines for Drinking-water Quality

Bacillus thuringiensis israelensis (BTI) is included in the plan of work of the rolling revision of the WHO Guidelines for Drinking-water Quality.

The background document and summary statement for the 4th edition are now available


Bti is a biopesticide applied to drinking-water containers in order to control the breeding of vectors that may cause a variety of diseases. The GDWQ FTF meeting (Geneva, 2003) recommended that a background document be prepared on Bti.

Expected end-product(s)

Background document on Bti, with summary statement to be included in Fourth Edition

Progress to date

The GDWQ WG meeting (Geneva, 2004) agreed to a plan of work. JMPR has evaluated Bti. The GDWQ WG meeting (Geneva, 2005) agreed to initiate a background document based on the JMPR assessment. Following discussions with the WHO Vector Ecology and Management Programme, the GDWQ WG meeting (Geneva, 2006) agreed on a path forward to illuminate this complex issue. The path forward was revised by the GDWQ WG meeting (Berlin, 2007). The GDWQ WG meeting (Singapore, 2008) agreed that the draft background document was ready for WG review.