Accession Number : ADA578686


Title :   Experimental Acquisition, Development, and Transmission of Leishmania tropica by Phlebotomus duboscqi


Descriptive Note : Journal article


Corporate Author : NAVAL MEDICAL RESEARCH UNIT NO 3 CAIRO (EGYPT) DEPT OF MEDICAL ZOOLOGY


Personal Author(s) : Hanafi, Hanafi A ; Nour El-Din, El-Shaimaa M ; El-Hossary, Shabaan S ; Kaldas, Rania M ; Villinski, Jeffrey T ; Furman, Barry D ; Fryauff, David J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a578686.pdf


Report Date : Jan 2013


Pagination or Media Count : 8


Abstract : We report experimental infection and transmission of Leishmania tropica (Wright), by the blood-feeding sand fly Phlebotomus duboscqi (Neveu-Lemaire). Groups of laboratory-reared female sand flies that fed naturally on L. tropica-infected hamsters, or artificially, via membrane feeding device, on a suspension of L. tropica amastigotes, were dissected at progressive time points post-feeding. Acquisition, retention and development of L. tropica through procyclic, nectomonad, and leptomonad stages to the infective metacyclic promastigote stage, and anterior progression of the parasites from abdominal midgut bloodmeal to the thoracic midgut were demonstrated in both groups. Membrane feeding on the concentrated amastigote suspension led to metacyclic promastigote infections in 60% of sand flies, whereas only 3% of P. duboscqi that fed naturally on an infected hamster developed metacyclics. Sand flies from both groups re-fed on naive hamsters, but despite infections in 25-50% of membrane-fed and 2-3.5% of naturally fed flies, no skin lesions developed in the hamsters. After four months of observation these animals were euthanized and necropsied. Screening of the organs and tissue by polymerase chain reaction (PCR) that targeted the small subunit RNA gene, amplified generic Leishmania DNA from liver, spleen, bone marrow and blood, but only from hamsters bitten by membrane-infected P. duboscqi. These results are notable in demonstrating the ability of P. duboscqi, originating from Kenya, to acquire, retain, develop, and transmit a Turkish strain of L. tropica originally isolated from a human case of cutaneous leishmaniasis. This marks the first demonstration of complete development and transmission of L. tropica by a member of the Phlebotomus subgenus of sand flies.


Descriptors :   *LEISHMANIA , HAMSTERS , HOSTS(BIOLOGY) , INFECTIOUS DISEASES , LESIONS , PARASITES


Subject Categories : Microbiology


Distribution Statement : APPROVED FOR PUBLIC RELEASE