Serological and parasitological follow-up in dogs experimentally infected with Leishmania infantum and treated with meglumine antimoniate

Cristina Riera, Josep Enric Valladares, Montserrat Gállego, Maria Jesus Aisa, Soledad Castillejo, Roser Fisa, Nuria Ribas, Jaume Carrió, Jordi Alberola, Margarita Arboix

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108 Citations (Scopus)

Abstract

Six healthy beagle dogs were infected with Leishmania infantum (MCAN/ES/92/BCN-83/MON-1) by intravenous inoculation of 5 X 107 promastigotes and two others were used as controls. When animals showed clinical signs of disease at 29, 37, 41 and 45 weeks post-infection (p.i.), they were treated with meglumine antimoniate (20.4 mg Sb/kg/12 h) subcutaneously for two periods of 10 days each. Sera were tested periodically for Leishmania antibodies by Dot-ELISA, ELISA and Western blot (WB). Aspirates of popliteal lymph node (PLN), peripheral blood sample (PB) and healthy skin were cultured in NNN and Schneider's medium. PLNs were positive between 8 and 20 weeks p.i. and in one animal PB was positive 6 weeks p.i. Samples of healthy skin, obtained before treatment, were also positive. Dot-ELISA and ELISA detected specific antibodies at an early stage between 4 and 12 weeks p.i and surpassed the cut-off between 16-24 weeks p.i., while the WB was positive between 10-19 weeks p.i. The pattern of bands revealed during the first stages of infection was variable and only in two cases did the positivity start with bands of low molecular weight (12-14 kD); the number of bands increased until 15-24 weeks p.i., after which sera revealed a complete pattern of bamds, from 12 to 85 kD, in the antigen of Leishmania. After treatment the clinical improvement of the animals was accompanied by a decrease in antibody titers (Dot-ELISA and ELISA) although the parasites remained in the PLN. This was reflected in the WB by a decrease in the intensity of bands, especially those in the region of 12-30kD. A new increase in the antibody levels between 3 and 5 months after terminating the therapy was detected in the WB by a restoration of the initial complete pattern of bands. Copyright (C) 1999 Elsevier Science B.V.
Original languageEnglish
Pages (from-to)33-47
JournalVeterinary Parasitology: Regional Studies and Reports
Volume84
DOIs
Publication statusPublished - 1 Jul 1999

Keywords

  • Control methods - Protozoa
  • Dog
  • Experimental infection
  • Follow-up
  • Leishmania infantum
  • Meglumine antimoniate

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