Helicobacter pylori (H.pylori) is a gram-negative microaerophilic bacterium that is

BACKGROUND: The development of an oral typhoid fever vaccine need more effective and having high-efficacy in preventing typhoid fever. The use of liposomes as a vaccine vehicle can be formulated to target a specific location or trigger the release of antigens on its target. β-Glucan derived from Candida albicans cell wall as immunoadjuvant can strengthen the immune response and increases the protection against Salmonella Typhi bacterial invasion. AIM: This study aimed to determine the immune response in typhoid fever mice by administering a combination of AdhO36 S. Typhi liposome vaccine with β-Glucan and determine the protectivity to inhibit bacterial colonization in typhoid fever. METHODS: Mice were divided into five groups include negative and positive control also treatment group. IL-12 was evaluated after 4-h immunization while the other (was IL-12, IL-10, Th1 (IL-2), Th2 (IL-4), and the protective test against bacterial invasion) evaluated after 96-h. RESULTS: IL-12 level in the combination of β-Glucan and AdhO36 groups showed significantly lower than infected groups (p = 0.034), whereas IL-10 level significantly increase (p = 0.0009). The percentage of Th-1 (IL-2) cells significantly lower than infected groups (p = 0.000), this also happened on the percentage of Th-2 (IL-4) cells that significantly lower than infected groups (p = 0.018). The protective test toward bacterial invasion showed no bacterial colonization in all tissues intestine, liver, spleen, and mesenteric lymph node. CONCLUSION: The administration of a combination of liposome containing β-Glucan from C. albicans and AdhO36 S. Typhi has a potential effect on cellular and humoral immune response.

Background: Klebsiella pneumoniae communicate between and among species using quorum sensing (QS). Biofilm formation and virulence factors are regulated by QS. This QS is indirectly responsible for K. pneumoniae pathogenicity. Inhibiting QS is a novel and highly effective method for controlling K. pneumoniae extended-spectrum beta-lactamases (KP-ESBL) infections. This study aimed to investigate how Aspergillus oryzae extracellular protein (AOEP) affected QS and KP-ESBL virulence factors. Methods: Methods used included minimal inhibitory concentration (MIC) through the microdilution method, biofilms with crystal violet staining, extracellular polysaccharides using the Congo Red assay, quantifying the expression of genes coding for capsular polysaccharide (wzI gene) and adhesion (mrkA gene) through quantitative reverse-transcription polymerase chain reaction (RT-qPCR), siderophore level measurement using Chrome Azurol sulphonate assay (CAS assay), biofilm morphology using a scanning electron microscope (SEM), and confirmation using the life span killing assay method on Caenorhabditis elegans (C. elegans). Results: In vitro studies revealed that AOEP inhibited biofilms and exopolysaccharides (EPS) in KP-ESBL at the sub-MIC level. In addition, AOEP inhibited the expression of the mrkA gene, which is involved in the adhesion process. Furthermore, an in vivo study revealed that AOEP levels of 75 and 150 µg/mL respectively increased C. elegans survival rates by 72.67% and 80.76% against K. pneumoniae infection. Conclusions: Our findings suggest that the extracellular protein of A. oryzae may be an effective QS inhibitor and a novel anti-virulence agent to control bacterial pathogens.

Introduction: Streptococcus pneumoniae (S. pneumoniae) causes pneumococcal disease, which has high mortality and morbidity in children under two years of age, the elderly and immunocompromised individuals. This disease can be prevented by immunization, but the current vaccine, pili protein vaccine (PPV), is less likely to protect children under the age of two and only protects against the serotypes contained in the vaccine. Hence, a new vaccine is needed to enable full protection. The use of bacterial pili proteins may offer an alternative new vaccine. Therefore, the determination of the ability of such proteins to stimulate mucosal immunity with indicator expression of pIgR and s-IgA is required. Materials and Methods: Pili were isolated using the pili bacterial cutter method, and used for nasal vaccination to the rats. TGF-β1, IL-17A, and s-IgA were measured by ELISA while pIgR was examined by immunohistochemistry. Results: This study demonstrated that intranasal immunization with antigen (54 kDa pili protein) and antigen plus adjuvant significantly increased (p<0.05) the expression of TGF-β1. However, the expression of IL-17A increased significantly (p<0.05) only in rats immunized with antigen plus adjuvant. Further analysis demonstrated that intranasal immunization with antigen and antigen plus adjuvant significantly increased (p<0.05) expression of pIgR. Expression of sIgA in nasal lavage significantly increased (p<0.05) in those rats which had been immunized with pili protein plus adjuvant. Conclusion: This study showed that the immünization with S. pneumoniae pili protein increased expression of pIgR and sIgA which are important mucosal immunity components. Therefore, this protein has potency to be developed as nasal vaccination to prevent S. pneumoniae infection.

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Acinetobacter baumannii (A. baumannii) is a pathogenic bacterium that can cause nosocomial infection in hospitalized patients with many kinds of manifestations. All bacterial infection is initiated by

Background:Covid-19 has become pandemic in the World, including Indonesia. Our last study showed that HSF could serve as an immunomodulator. Using the exact search, we found that the most immuno-dominant SARS-COV2 epitope, namely A spike protein epitope, B envelope protein epitope, and C membrane protein epitope, we concise to be HF Materials and Methods:We used to post only control design study and mice as an animal model. The research divided mice into four groups, and the first group as control received PBS as a placebo. The second, three, and last four groups gave HF, HSN, and HFHSN (combine HF and HSN). All of the regiment enters the mouth with a special sonde to reach the gastrointestinal organ. We gave HF every week three times and HSN once a day. After administration regiments for a long three weeks, we sacrificed the mice. We evaluated cellular immune responses that are Th-2, Th-17, and NK cells. We check for humoral immune response, TGF-β,IL-17A, IL-4, IgG,IL-4, β-defensin, and s-IgA. Results:Highest profile cellular immunity HF, HSN, and HFHSN were NK cell, Th-2 and Th-17, and the last NK cell, respectively. After that which in humoral immunity, the domination response IgG and IL-4 were HF. But HSN and HFHSN dominated for s-IgA and β-defensin production. By using the study Bio-Informatica, we found HF. Conclusion: If the results of this study are continued to the clinical trial level, it is necessary to recommend additional markers such as CTL (s-IgA and β-defensin in lung tissue)and CPE assay.