Persistence of specific antibody response in different experimental infections of mice with Toxocara canis larvae Persistência da resposta humoral em camundongos experimentalmente infectados com larvas de Toxocara canis

• Published in: Revista do Instituto de Medicina Tropical de São Paulo
• Main Authors: Pedro Paulo Chieffi, Benedito A Peres, Elisabete O. de Mello, Herminia Kanamura, Marcelo M. Brandão
• Format: Article in Journal/Newspaper
• Language: English
• Published: Universidade de São Paulo (USP) 1995
• Subjects: Toxocara canis; Antibodies anti-Toxocara; Experimental toxocariasis; Arctic medicine. Tropical medicine; RC955-962; Infectious and parasitic diseases; RC109-216; Arctic; Sob’
• Online Access: https://doi.org/10.1590/S0036-46651995000300001; https://doaj.org/article/0c51af6617cf40a5bf5bf7b7177fc3df

Anti-Toxocara antibody production and persistence were studied in experimental infections of BALB/c mice, according to three different schedules: Group I (GI) - 25 mice infected with 200 T. canis eggs in a single dose; Group II (GII) 25 mice infected with 150 T. canis eggs given in three occasions, 50 in the 1st, 50 in the 5th and 50 in the 8th days; Group III (GIII) - 25 mice also infected with 150 T. canis eggs, in three 50 eggs portions given in the 1st, 14th and 28th days. A 15 mice control group (GIV) was maintained without infection. In the 30th, 50th, 60th, 75th, 105th and 180th post-infection days three mice of the GI, GII and GIII groups and two mice of the control group had been sacrificed and exsanguinated for sera obtention. In the 360th day the remainder mice of the four groups were, in the same way, killed and processed. The obtained sera were searched for the presence of anti-Toxocara antibodies by an ELISA technique, using T. canis larvae excretion-secretion antigen. In the GI and GII, but not in the GIII, anti-Toxocara antibodies had been found, at least, up to the 180th post-infection day. The GIII only showed anti-Toxocara antibodies, at significant level, in the 30th post-infection day. Estudou-se a cinética de anticorpos anti-Toxocara em camundongos BALB/c infectados experimentalmente segundo três esquemas: Grupo I (GI): 25 camundongos infectados com dose única de 200 ovos embrionados de T. canis; grupo II (GII): 25 camundongos infectados com 150 ovos embrionados de T. canis, divididos em três doses de 50 ovos, administrados no 1º, 5º e 8º dias; Grupo III (GIII): 25 camundongos infectados com 150 ovos embrionados de T. canis, administrados em três doses de 50 ovos no 1º, 14º e 28º dias. Um grupo de 15 camundongos foi mantido nas mesmas condições, porém sem infecção, constituindo o grupo controle (GIV). No 30º, 50º, 60º, 75º, 105º e 180º dias pós-infecção três camundongos dos grupos GI, GII e GIII e dois do grupo controle foram sacrificados sob anestesia e sangrados para obtenção de soro. No ...