The median effective doses (ED(50)) of 28 lots of killed Pasteurella pestis strain 195/P vaccine were determined in mice and guinea pigs. Mice were injected with vaccine alone, whereas guinea pigs received vaccine suspended in incomplete Freund's adjuvant. Potency ratios of vaccines were obtained by comparing the ED(50) of the test with that of a reference vaccine. Mean potency ratios of 1.82 +...

A new generation of vaccines for the neglected tropical diseases (NTDs) have now advanced into clinical development, with the Na-GST-1/Alhydrogel Hookworm Vaccine already being tested in Phase 1 studies in healthy adults. The current manuscript focuses on the often overlooked critical aspects of NTD vaccine product development, more specifically, vaccine stability testing programs. A key measur...

There is currently no International Standard suitable for the standardization of assays of vaccines from the manufacturer. The manufacturer has therefore established a product-specific reference preparation which is traceable to a lot of vaccine shown to be efficacious in clinical trials. This vaccine will serve as a working standard and will be included in all potency tests. The NRA approves t...

background whooping cough is caused by bordetella pertussis, and it remains a public health concern. whole-cell pertussis vaccines have been commonly employed for expanded immunization. there is no doubt of the efficacy of whole cell pertussis vaccine, but it is necessary to improve the vaccine to decrease its toxicity. objectives in this study, an inactivation process of dealing with pertussis...

remote villages without sending the patients to anti-rabic centres? A search through literature tells us that nowadays anti-rabic vaccine can be sent out in ampoules to different parts of the country, thus doing away with the necessity of maintaining centralized anti-rabic institutes. Is the potency of the vaccine affected in any way during transit and storage at the ordinary room temperature? ...

Introduction: Epidermal growth factor receptor (EGFR) has been shown to play a critical role in tumor cell growth and its overexpression has been observed in many epithelial tumors. In the field of cancer vaccine research, displaying the peptide mimotope on the surface of phage particles has shown promising results. Methods: In this study using m13-PVIII phage display system, two constructs we...

The present study evaluates immunogenicity and protection potency of a codon-optimized GRA1 DNA vaccine, wild type GRA1 DNA vaccine and an adjuvanted recombinant GRA1 protein vaccine candidate in BALB/c mice against lethal toxoplasmosis. Of the three GRA1 vaccines tested, the recombinant GRA1 protein vaccine results reveal significant increase in immune response and prolonged survival against a...

BACKGROUND Potency test for control of rubella vaccine is a significant factor to qualify production line and vaccination program. For this reason, WHO recommends to use the microtitration method by both vaccine companies and control laboratories. Then the study was done to improve this test. METHODS Three rubella virus samples, including an in-house standard, a lot of vaccine and an in-proce...

Background: Despite a global decline in mortality and morbidity from measles in the last decade, outbreaks continue to occur in some parts of the world including Nigeria. Objective: To determine antibody response to routine measles vaccination in Nigerian children and evaluate vaccine potency. Methods: A prospective study of 234 children selected from 3 health centres in an urban area of Lagos,...

BACKGROUND Standardization of inactivated influenza vaccines by hemagglutinin (HA) content is performed by the single radial immunodiffusion (SRID) method. Regulatory agencies prepare, calibrate, and distribute SRID reagent standards necessary for testing of seasonal influenza vaccines, and a similar process is used to produce potency reagents for candidate pandemic influenza vaccines that are ...