The purpose of this research was to develop a suitable and alternate adjuvant for the tetanus toxoid (TT) vaccine that induces long term immunity after a single-dose immunization. In our study, the preformulation studies were carried out by using different ratios (7/3, 8/2, and 9/1) of chitosan-hydroxypropyl methylcellulose (HPMC)-blended empty microspheres. Moreover, TT was stabilized with heparin (at heparin concentrations of 1%, 2%, 3%, and 4% w/v) and encapsulated in ideal chitosan - HPMC (CHBMS) microspheres, by the water-in-oil-in-water (W/O/W) multiple emulsion method. The vaccine entrapment and the in vitro release efficiency of the CHBMS was evaluated for a period of 90 days. The release of antigens from the microspheres was determined by ELISA. Antigen integrity was investigated by SDS-PAGE. From the optimization studies, it was found that a chitosan/HPMC ratio of 8/2 produced a good yield, with microspheres that were spherical, regular and uniformly-sized. In the CHBMS, a heparin concentration of 3% w/v resulted in well-sustained antigen delivery for a period of 90 days. It was found that the characteristics of initial release could be observed in 2 days, followed by a constant release, and an almost 100% complete release in 90 days. From the in vitro release characteristics, the ideal batch of CHBMS (3% w/v heparin) was evaluated for in vivo studies by the antibody induction method. The antibody levels were measured for different combinations for the period of 9 months, and finally, with a second booster dose after 1 year. In conclusion, it was observed that CHBMS (combination-1) resulted in the antibody level of 4.5 IU/mL of guinea pig serum, and the level was 3.5 IU/mL for the Central Research Institute's alum-adsorbed tetanus toxoid (CRITT) (combination 2), after 1 year, with a second booster dose. This novel approach of using CHBMS may have potential advantages for single-step immunization with vaccines.
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http://dx.doi.org/10.3109/21691401.2014.966193 | DOI Listing |
Niger Med J
January 2025
Department of Medical Microbiology, Usman Danfodiyo University Teaching Hospital, Sokoto, Nigeria.
Background: Anthrax is a life-threatening zoonotic disease caused by Gram-positive, spore-forming bacterium . It manifests as a cutaneous, gastrointestinal, and respiratory disease. The cutaneous form ranges from a self-limiting lesion to severe edematous lesions with toxemic shock.
View Article and Find Full Text PDFNed Tijdschr Geneeskd
January 2025
Anna Ziekenhuis, afd. Interne Geneeskunde, Geldrop.
We present a 78-year-old, unvaccinated woman with a tetanus induced severe opisthotonos, requiring mechanical ventilation. We point out the importance of verifying the vaccination status for older patients born before the early 1950's and patients with a migration background. Additionally, we emphasize on administering appropriate post-exposure prophylaxis.
View Article and Find Full Text PDFIran J Pharm Res
September 2024
Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran.
Background: Despite the availability of tetanus-diphtheria (TD) vaccines in Iran, the seroconversion rate of these products as a booster dose is unknown.
Objectives: This study evaluates the seroconversion rate of the Iranian Td vaccine in adults who have not been vaccinated in the past decade.
Methods: In this study, 20 adult volunteers aged 18 to 60 who had not received the Td vaccine in the past decade received a booster dose of the Iranian Td vaccine.
PLoS One
January 2025
Department of Statistics, Shahjalal University of Science & Technology, Sylhet, Bangladesh.
Background: Maternal tetanus toxoid (MTT) vaccination during pregnancy remains an important factor for reducing infant mortality globally, especially in developing nations, including Bangladesh. Despite commendable progress in reducing child mortality through widespread MTT vaccination during pregnancy, the issue still exists. This analysis explores the impact of MTT vaccination on neonatal mortality in Bangladesh and identifies associated factors.
View Article and Find Full Text PDFEur J Immunol
January 2025
Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands.
Many human autoimmune diseases (AIDs) are hallmarked by the presence and persistence of autoreactive B-cells. While autoreactive B-cells may frequently encounter antigens, the signals required to balance and maintain their activation and survival are mostly unknown. Understanding such signals may be important for strategies aimed at eliminating human B-cell autoreactivity.
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