agar and Ascariasis

Four groups each of 3 pigs were inoculated with Ascaris suum eggs. Pigs in groups 1 and 3 were inoculated with 1000 eggs, and pigs in groups 2 and 4 with 10,000 eggs. On day 10 and 21 post-inoculation (p.i.), respectively, groups 1 + 2 and 3 + 4 were slaughtered, and the contents from the small intestines collected. The contents were mixed with agar to a final concentration of 1% agar and allowed to sediment. The larvae were allowed to migrate from the agar-gel into 38 degrees C 0.9% saline overnight, and were then collected on a sieve (20 microns mesh) and counted. The larvae retained in the agar-gel were counted after pouring the melted agar through a sieve (20 microns mesh). The results showed that more than 97% of the larvae migrated out of the agar-gel and were available for counting in an almost clean suspension. The inoculation dose level did not significantly affect the recovery percentage, neither did the larval stage (10 or 21 days old larvae). The variation in the time interval from slaughtering to start of incubation (interval 57-155 min) did not significantly affect the recovery percentage.

Topics: Agar; Animals; Ascariasis; Ascaris suum; Gels; Intestine, Small; Larva; Swine; Swine Diseases; Time Factors

Nine groups of 5 pigs were inoculated with Ascaris suum eggs on day 0. Groups 1, 2, and 3 were inoculated with 100 eggs, groups 4, 5, and 6 with 1,000 eggs, and groups 7, 8, and 9 with 10,000 eggs. On day 3, groups 1, 4, and 7 were slaughtered, on day 7 groups 2, 5, and 8, and on day 10 groups 3, 6, and 9. The liver (days 3 and 7) and lungs (days 3, 7, and 10) were removed and 2, 25% samples of both organs were collected. Larvae were recovered from 1 sample by the Baermann method and from the other by an agar-gel method. Overall there were no significant differences in the liver larval recovery between the 2 methods. The use of the agar-gel method resulted in a very clean suspension of larvae and thereby reduced the sample counting time by a factor of 5-10 compared to the Baermann method. With both methods larval recovery from the lungs resulted in a clean larval suspension that was easy to count, and there were overall no significant differences between the 2 methods, although there was a tendency toward the Baermann method recovering more larvae from the lungs than the agar-gel method. The tissue sample dry weight did not significantly influence larval recovery by the agar-gel method, and the time interval from slaughtering to start of incubation on day 3 (interval 51-92 min), day 7 (interval 37-114 min), and day 10 (interval 50-129 min) had no significant effect on recovery by either method.

Topics: Agar; Animals; Ascariasis; Ascaris suum; Female; Gels; Larva; Liver; Lung; Male; Swine; Swine Diseases

The antigenic analysis of Toxocara canis a causative agent of visceral larva migrans and Ascaris suum has been carried out. Agar gel double diffusion techniques and its modifications were employed to determine whether or not crude antigens, obtained from the adult parasites: (a) contained components unique for each, (b) could be used to differentiate the parasites serologically. Adult Toxocara canis and Ascanis suum antigens used in this study were found to contain several unique antigenic components. It was shown that antisera produced in rabbits artificially immunized against adult Ascaris and Toxocara could be specifically differentiated from each other by using intragel absorption test.

Topics: Agar; Animals; Antigens; Ascariasis; Ascaris; Diagnosis, Differential; Immune Sera; Immunodiffusion; Rabbits; Serologic Tests; Toxocara; Toxocariasis

Topics: Agar; Ascariasis; Child; Eye Diseases; Female; Fluorescence; Fundus Oculi; Gels; Granuloma; Humans; Inflammation; Larva; Macula Lutea; Precipitin Tests

Topics: Agar; Animals; Antigen-Antibody Reactions; Ascariasis; Ascaris; Ascaris lumbricoides; Culture Media; Humans; Precipitin Tests; Skin Tests; Swine