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Edwardsiella tarda is a Gram-negative bacterial pathogen and the etiological agent of a systematic fish disease called edwardsiellosis, which affects a wide range of marine and freshwater fish. E. tarda vaccines in various forms have been reported by a number of research groups; however, comparative studies on the immune mechanisms of these vaccines are lacking. In this report, we identified a new...
Cimetidine (CIM) is a histamine H2 receptor inverse agonist used primarily as an anti-stomach acids drug, but recent studies showed that it may also modulate immune responses. To evaluate its potential usefulness as an adjuvant, we determined its immune modulating effects on subunit immunization using an HBV-derived recombinant protein antigen rHBsAg. CIM activated the PI3K-Akt signaling pathway in...
The henipaviruses, Hendra virus (HeV) and Nipah virus (NiV), are two deadly zoonotic viruses for which no vaccines or therapeutics have yet been approved for human or livestock use. In 14 outbreaks since 1994 HeV has been responsible for multiple fatalities in horses and humans, with all known human infections resulting from close contact with infected horses. A vaccine that prevents virus shedding...
The membrane-proximal region spanning residues 649–684 of the HIV-1 envelope protein gp41 (MPR 649–684 ) is an attractive vaccine target for humoral immunity that blocks viral transcytosis across the mucosal epithelia. However, induction of high-titer MPR 649–684 -specific antibodies remains a challenging task. To explore potential solutions for this challenge, we tested a new translational...
Francisella tularensis is a highly pathogenic gram negative bacterium that infects multiple sites in a host, including the skin and the respiratory tract, which can lead to the onset of a deadly disease with a 50% mortality rate. The live vaccine strain (LVS) of F. tularensis, while attenuated in humans but still virulent in mice, is not an option for vaccine use in the United States due to safety...
Botulinum neurotoxins (BoNT) are classified into 7 serotypes (A–G) based upon neutralization by serotype-specific anti-sera. Several recombinant serotype-specific subunit BoNT vaccines have been developed, including a subunit vaccine comprising the receptor binding domain (HCR) of the BoNTs. Sequencing of the genes encoding BoNTs has identified variants (subtypes) that possess up to 32% primary amino...
Coccidiosis is an economically important disease affecting poultry industry and remains one of the major problems globally. Developing a cost effective sub-unit vaccine may help mitigate loss in the industry. Here, we report expressing one of the microneme proteins, EtMIC2 from Eimeria tenella in tobacco using Agrobacterium-mediated transient expression. The ability of plant expressed recombinant...
To search for more effective vaccines to enhance the immunogenicity and protective efficacy of Mycobacterium bovis Bacille Calmette-Guerin (BCG) and to control or even eradicate Mycobacterium tuberculosis (M. tuberculosis) in all stages of infection including the persister bacteria, antigens of Mtb10.4 (Rv0288) expressed in replicating bacilli and HspX (also called Acr, Hsp16.3, Rv2031c) highly expressed...
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