Detection of circulating Trichinella spiralis muscle larva antigens in serum samples of experimentally and naturally infected swine.
A follow up study was carried out to determine the kinetics of appearance of surface/stichosomal (S/S) components, recently included in the TSL-1 group of Trichinella spiralis muscle larva (ML), in serum samples from 13 experimentally infected pigs. Detection of circulating antigens in these animals was done by a sandwich enzyme-linked immunosorbent assay (ELISA) using T. spiralis specific rabbit polyclonal immunoglobulins to capture free antigens and monoclonal antibody NIM-M1 to recognize S/S antigens. The assay developed was able to detect as little as 35 ng ml-1 of S/S components added to normal pig serum. Antigenemia was observed in 54% of the experimentally infected swine with two peaks of appearance, one early at 1-4 weeks post-infection (pi) and one late at 10-14 weeks pi. Specific antibodies against S/S components were demonstrated in serum samples from all experimentally infected pigs starting at 3-4 weeks pi. Free antigen was also detected in serum samples from naturally infected backyard pigs with a sensitivity of 56% compared with 94% when antibody production was determined using purified S/S components in an ELISA.
Depto. de Inmunología, CENID-Microbiología, INIFAP, D. F. Mexico, Mexico.
C
C
Arriaga
L
L
Yépez-Mulia
A
A
Morilla
G
G
Ortega-Pierres
D000818:Animals; D000909:Antibodies, Helminth / Q000097:blood; D000947:Antigens, Helminth / Q000097:blood* / Q000276:immunology; D004797:Enzyme-Linked Immunosorbent Assay; D005500:Follow-Up Studies; D007814:Larva / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D009132:Muscles / Q000469:parasitology*; D011817:Rabbits; D012680:Sensitivity and Specificity; D013552:Swine; D013553:Swine Diseases / Q000097:blood / Q000469:parasitology*; D017160:Trichinella spiralis / Q000276:immunology*; D014235:Trichinellosis / Q000097:blood / Q000276:immunology / Q000662:veterinary*
D000909:Antibodies, Helminth; D000947:Antigens, Helminth