Studies on human anti-rabies immunization in Brazil: II - Preliminary evaluation of the 2-1-1 schedule for human pre-exposure anti-rabies immunization, employing suckling mouse brain vaccine Estudos sobre imunização anti-rábica humana no Brasil: II - Avaliação preliminar do esquema 2-1-1 para imunização anti-rábica humana pré-exposição, empregando vacina de tecido nervoso de camundongos recém-nascidos

• Published in: Revista do Instituto de Medicina Tropical de São Paulo
• Main Authors: Carlos Roberto Zanetti, Luiza Marny Lee, Luciana Botelho Chaves, José Luiz Rodrigues, Gilton C Eleutério, Octavio Augusto de C. Pereira
• Format: Article in Journal/Newspaper
• Language: English
• Published: Universidade de São Paulo (USP) 1995
• Subjects: Rabies; Human pre-exposure vaccination; 2-1-1 schedule; Mouse brain vaccine; Arctic medicine. Tropical medicine; RC955-962; Infectious and parasitic diseases; RC109-216; Arctic
• Online Access: https://doi.org/10.1590/S0036-46651995000400012; https://doaj.org/article/9e44e61b1d9d42a299527591d2c22fb5

This study reports preliminary results of virus neutralizing antibody (VNA) titers obtained on different days in the course of human anti-rabies immunization with the 2-1-1 schedule (one dose is given in the right arm and one dose in the left arm at day 0, and one dose is apllied on days 7 and 21), recommended by WHO for post-exposure treatment with cell culture vaccines. A variant schedule (double dose on day zero and another on day 14) was also tested, both employing suckling mouse brain vaccine. A complete seroconversion rate was obtained after only 3 vaccine doses, and almost all patients (11 of 12) presented titers higher than 1.0 IU/ml. Both neutralizing response and seroconversion rates were lower in the group receiving only 3 doses, regardless of the sample collecting day. Although our results are lower than those found with cell culture vaccines, the geometry mean of VNA is fully satisfactory, overcoming the lower limit recommended by WHO of 0.5 IU/ml. The 2-1-1 schedule could be an alternative one for pre exposure immunization, shorter than the classical 3+1 regimen (one dose on days 0, 2, 4 and 30) with only three visits to the doctor, instead of four. Este estudo apresenta resultados preliminares de títulos de anticorpos neutralizantes (AcN) obtidos em diferentes dias durante imunização anti-rábica humana empregando o esquema 2-1-1 (uma dose administrada em cada deltóide no dia 0, e uma dose nos dias 7 e 21), recomendado pela OMS para tratamento pós-exposição com vacinas de cultivo celular. Um esquema variante (dose dupla no dia zero e outra no dia 14) também foi testado; em ambos esquemas utilizamos a vacina produzida em cérebro de camundongos recém-nascidos. Obteve-se taxa de soroconversão total após 3 doses de vacina, e quase todos os pacientes (11 de 12) apresentaram títulos maiores que 1,0 UI/ml. Tanto os títulos de anticorpos neutralizantes como a taxa de soroconversão foram menores no grupo que recebeu apenas 3 doses, independentemente do dia da coleta de soro. Embora nossos resultados tenham ...