The presence of Giardia and Cryptosporidium in surface waters and effluents in Israel.
IAWQ international symposium on health-related water microbiology. Mallorca (ESP), 1996/10/06.
During a period of 9 months (May 1995-January 1996), various environmental sources were investigated for the presence of Giardia and Cryptosporidium in Israel.
Out of 15 samples from five streams, 12 were positive for Cryptosporidium (80%) with an average concentration of 0.04-1.9 oocysts/l and 8 were positive for Giardia (53.3%) with 0.05-0.78 cystsfl.
Two springs were also tested and found positive for Cryptosporidium and (0.54 oocystsfl) only.
The main drinking water reservoir of Israel, Lake Kineret, was also sampled 6 times at two sites.
Cryptosporidium was isolated in 4/6 samples (66.6%) at an average concentration of 0.3-1.09 oacystsfl while Giardia was present in 5/6 samples (83.3%), 0.135-16.2 cysts/l. Drinking water entering a filtration pilot plant was also tested and found positive for Cryptosporidium in 23/35 samples (0-317 oacysts/l) and 8/35 for Giardia (0-16.7 cysts/l).
In order to evaluate some potential inputs of contamination of the drinking water sources, two possible contributors were tested : domestic sewage and cowshed effluents.
In sewage effluents, 3/3 samples were positive for both Cryptosporidium and Giardia.
The oocysts and cysts were present at 8.3-8.05/1 and 5-27.3/1 respectively.
In cowshed effluents, 1/6 samples was positive for Cryptosporidium at a high concentration (3.630 oocysts/l) but no Giardia cysts were found. (...)
Mots-clés Pascal : Israël, Asie, Pollution eau, Eau surface, Eau usée domestique, Giardia lamblia, Diplomonadida, Protozoa, Cryptosporidium parvum, Sporozoa, Eau potable, Oocyste, Kyste, Parasite, Pathogène
Mots-clés Pascal anglais : Israel, Asia, Water pollution, Surface water, Domestic waste water, Giardia lamblia, Diplomonadida, Protozoa, Cryptosporidium parvum, Sporozoa, Drinking water, Oocyst, Cyst, Parasite, Pathogenic
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0487416
Code Inist : 001D16A04C. Création : 03/02/1998.