Active clinical trials for "Rabies"

Reduced 4-dose intramuscular rabies vaccination schedule was announced by US-ACIP and WHO to be one of the post-exposure prophylaxis regimens. However, concurrent usage of this regimen with rabies immunoglobulin have never been studied in the aspect that the immunity level would above the protective level required by WHO (0.5 IU/ml) for at least a year period. This study would access this subject.

The purpose of this study is to evaluate the long-term persistence of immune responses approximately 5 years or more after simulated rabies post-exposure prophylaxis provided in 2012 according to Essen (1-1-1-1-1) or Zagreb (2-1-1) intramuscular (IM) regimens in the subset of subjects who participated in the parent study (V49_24 [NCT01680016]) who were aged ≥6 and ≤17 years at the time of enrollment. This study is aimed to respond to a post-marketing commitment by the China Food and Drug Administration (CFDA) requested at the time of the renewal of the purified chicken-embryo cell rabies vaccine license in China, granted in August 2015.

This quasi-experimental, quality improvement study will be conducted across the Houston Methodist system, including all hospital-based and freestanding emergency departments (ED). Previous research identified opportunities to improve patient selection and delivery of rabies immune globulin (IG) as recommended by Centers for Disease Control and Prevention (CDC) guideline recommendations for rabies postexposure prophylaxis (PEP). The purpose of this study is to develop, implement, and measure the impact of a quality improvement bundle that consists of (1) rabies PEP electronic health records (EHR) enhancements, (2) education to ED staff, and (3) education to patients. Adherence to quality indicators, which are based on CDC guideline recommendations, for patient selection and delivery of rabies IG for 12 months following implementation (post-implementation group) will be compared with a historical control group.

A rabies virus neutralizing antibody (RVNA) concentration ≥ 0.5 IU/ml at 14 days after immunization is considered a proxy for protection in vaccine efficacy studies. Abridged and dose-sparing vaccination regimens increase accessibility and reduce both direct and indirect costs, especially in resource-constrained countries where RABV prevalence is highest. Several efficacy studies evaluated safety and immunogenicity of abridged regimens in healthy adult volunteers using either four-site intradermal (ID) or intramuscular (IM) regimens, showing them to be safe and immunogenic. Researchers at the Institut Pasteur du Cambodge (IPC) have previously conducted a retrospective study on clinical outcome at ≥6 months in 3318 Cambodians who received intradermal Vero cell vaccine post-exposure prophylaxis after a bite by a rabid or sick-looking but untested dog in 2003-2014. Here, the investigators could show that there was no significant difference in survival among patients who received 3 versus 4 sessions of the Thai Red Cross (TRC) ID regimen. In a separate study, investigators measured antibody responses in order to evaluate the immunogenicity of the TRC regiment after 3 sessions versus 4 sessions. The investigators did not observe an increase in rabies virus seroneutralization titers 14 days after the fourth immunization compared to 14 days after the third immunization. These results contributed to changes endorsed by the WHO in its April 2018 guidelines. The "Institut Pasteur du Cambodge (IPC) regimen" of three PEP sessions of two-site ID 0.1 mL vaccine doses each at days 0, 3 and 7 is the first one-week PEP regimen to be recommended. In the current research project, the aim is to compare further different PEP vaccination strategies in a real life setting of individuals attending the rabies vaccination center at Institut Pasteur du Cambodge (IPC) in Phom Penh, Cambodia. The antibody kinetics and cellular immune responses in patients following either the one-week, 2-site ID regimen (IPC regimen) or the two-week IM regimen (4-dose regimen) as well as the participants' survival for both protocols after 6 months are evaluated.

Rabies immune globulin is a product that is lifesaving to unvaccinated individuals exposed to the rabies virus. Rabies immune globulin is made from plasma from immune donors. Currently the only practical method to obtain this plasma is to immunize normal volunteer Source Plasma donors and collect their plasma while titers are adequate. The use of rabies vaccine for immunization of normal Source Plasma donors is currently limited to a level that, while protective for the individual, is unsuitable for production of rabies immune globulin. The objective of this study is to obtain efficacy and safety data regarding the rabies boostering program to demonstrate that: Rabies immune plasma production can be substantially increased by giving booster doses to previously immunized donors whose titers are below 10.0 IU/mL. It is safe for normal Source Plasma donors to receive booster doses of rabies vaccine on a regular basis. This study utilizes two rabies vaccines approved by the FDA, Imovax® (Sanofi-Pasteur) and RabAvert® (Novartis).

This study will evaluate the immunogenicity of rabies vaccine at 13 months, 3 year and 5 years after initial vaccination, administered in two different post-exposure vaccination schedules

To determine optimum dose level for a single visit multidose intradermal injection of rabies vaccine with the aim to induce immunological memory in all subjects.

The purpose of this study is to evaluate diagnostic immunization protocol of rabies vaccine for diagnosis the patients with primary immunodeficiency disorders and study humoral and cellular immune response to rabies vaccine in patients with primary immunodeficiency.

To determine Immunogenicity and Safety Study of Modified TRC-ID Regimen with A New Chromatographically Purified Vero Cell Rabies Vaccine (SPEEDA®) as post exposure rabies intradermal regimen with or without Rabies Immunoglobulin in Children

This study is to investigate the persistence of rabies Chinese manufactured antibody 1-5 years after the post-exposure prophylaxis with vero cell antirabies vaccine and antibody response to a single booster dose. A total of 160 subjects would be enrolled. These subjects were all administered ChengDa antirabies vaccine from 2005 to 2009. After informed consent is obtained, these subjects would be tested for their antirabies antibody titer and given a single booster dose. Seven and 14 days later, the investigators would re-evaluate the antibody titer.