Bedros Nersessian

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Ducklings were given egg-derived antibody against Salmonella enteritidis (Ab) in drinking water daily to determine if infection could be prevented. Pekin ducklings in all experimental groups were infected on Day 1 or 5 with 0.7 x 10(6) Salmonella enteritidis (SE). Spleen, liver, and intestine of each bird were collected and cultured on Days 7, 14, 21, and(More)
Embryonic mortality is a significant problem plaguing the commercial duck industry worldwide. Yet, an objective means to stage development of the duck embryo is lacking. Such a staging procedure, which is described in this study, is essential for the critical and reproducible assessment of embryo development. The morphological features associated with duck(More)
Riemerella anatipestifer is a gram-negative bacteria that can cause disease in a wide variety of wild and domesticated birds, especially waterfowl. The infection can be peracute, acute, or chronic. Although various routes of transmission have been proposed, to date, there is little information on the effects of route of transmission and challenge dosage on(More)
COMBSCORES determined using the ImmunoComb solid-phase immunoassay were compared with hemagglutination-inhibition (HI) titers specific for Newcastle disease virus (NDV) and infectious bronchitis virus (IBV) and with mean enzyme-linked immunosorbent assay (ELISA) titers determined using Agritech Systems, Inc., ELISA. COMBSCORES for NDV and IBV increased(More)
The pathogenicity of four clone-purified reoviruses (81-51, 81-68, 81-311, and 82-88) was studied in experimentally infected specific-pathogen-free (SPF) chicken embryos and chicks. SPF and specific-antigen-and-antibody-negative (SAAN) turkey poults, and suckling mice. In SPF embryos, all four viruses caused death or lesions characteristic for avian(More)
The antigenic interrelatedness of 3 clone-purified turkey reoviruses (NG-Turkey, 82-88, and NC-TEV) to each other and to 4 clone-purified chicken reoviruses (S1133, Co8, Fahey-Crawley, and avian type 2) was determined in reciprocal cross-neutralization tests, using polyclonal antisera and the plaque-reduction technique. The morphologic features of plaques(More)
A micromethod was modified to quantitate intestinal D-xylose absorption in young and extremely small birds. This test was performed in control and cloned-reovirus-inoculated turkey poults to investigate intestinal absorptive function. Absorption peaks and curves for control poults closely resembled those observed in normal humans. Poult groups absorbed(More)
Day-old specific-antibody-negative turkey poults were inoculated orally with cloned turkey reovirus isolate 81-68. Virus reisolations from 11 different tissues revealed widespread distribution at 3, 5, and 7 days postinoculation (PI). Virus was isolated from the intestines until 21 days PI. Virus was isolated from tendons until day 7 PI and again at day 28(More)
The purpose of this study was to determine the virulence of raptorial Pasteurella multocida for ducks and the effect of various routes of inoculation on virulence. Four-week-old Pekin ducks (Anas platyrhynchos) were challenged with one of three raptorial isolates (RTHA-2, RTHA-4, or WESO-1) by one of five inoculation routes (intranasal, intraocular,(More)