Volume 73, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Two species of are reported from Egypt, the indigenous and , the latter believed to be introduced during the past few decades. Both are known to be excellent hosts of , the human-infecting blood fluke common in Egypt. Given the concerns regarding the spread of the exotic , this study was carried out to get a more current picture of the status of in Egypt. Snail collections were undertaken during 2002–2003 from regions between Alexandria and Ismailia in the north of the Nile Delta, to as far south as Abu Simbel at Lake Nasser. snails were found in 37 out of 76 sampled localities and were widely distributed in the Nile Delta and along the Nile as far south as Aswan. According to the results of species-specific polymerase chain reaction assays that sampled both nuclear and mitochondrial genomes, and according to DNA sequence data, all collected during this survey were . There was no evidence of the presence of or of hybridization of with in the examined sites. The results were surprising given that some field-collected snails strongly resembled in both size and conchology and that previous survey work suggested had established in Egypt. Continued scrutiny to ascertain the possible presence of in Egypt is warranted. Also, the planorbid was detected in the Delta and as far south as Aswan, so it is important for Egyptian schistosomiasis workers to accurately distinguish this non-schistosome-transmitting snail from .


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  • Received : 17 Sep 2004
  • Accepted : 21 Jan 2005

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