• Journal of Veterinary Science
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• 제22권3호
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• pp.30.1-30.15
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• 2021

Background: New-generation adjuvants for foot-and-mouth disease virus (FMDV) vaccines can improve the efficacy of existing vaccines. Chinese medicinal herb polysaccharide possesses better promoting effects. Objectives: In this study, the aqueous extract from Artemisia rupestris L. (AEAR), an immunoregulatory crude polysaccharide, was utilized as the adjuvant of inactivated FMDV vaccine to explore their immune regulation roles. Methods: The mice in each group were subcutaneously injected with different vaccine formulations containing inactivated FMDV antigen adjuvanted with three doses (low, medium, and high) of AEAR or AEAR with ISA-206 adjuvant for 2 times respectively in 1 and 14 days. The variations of antibody level, lymphocyte count, and cytokine secretion in 14 to 42 days after first vaccination were monitored. Then cytotoxic T lymphocyte (CTL) response and antibody duration were measured after the second vaccination. Results: AEAR significantly induced FMDV-specific antibody titers and lymphocyte activation. AEAR at a medium dose stimulated Th1/Th2-type response through interleukin-4 and interferon-γ secreted by CD4⁺ T cells. Effective T lymphocyte counts were significantly elevated by AEAR. Importantly, the efficient CTL response was remarkably provoked by AEAR. Furthermore, AEAR at a low dose and ISA-206 adjuvant also synergistically promoted immune responses more significantly in immunized mice than those injected with only ISA-206 adjuvant and the stable antibody duration without body weight loss was 6 months. Conclusions: These findings suggested that AEAR had potential utility as a polysaccharide adjuvant for FMDV vaccines.

• Pediatric Infection and Vaccine
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• 제16권2호
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• pp.183-190
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• 2009

목 적: 본 연구에서는 일본뇌염 백신의 종류별 이상반응 발생실태를 조사하여 일본뇌염 백신의 안전성에 대한 평가를 통해 향후 일본뇌염 국가예방접종사업의 효율화를 위한 토대를 제공하고자 하였다. 방 법: 2006년 8월부터 2007년 2월까지 본 연구에 협력하기로 한 일개 대도시 지역의 보건소 4개소와 소아과 의원 9개소에서 실시되었다. 총 658명의 어린이를 대상으로 이상반응 평가가 완료되었다. 이들 어린이들을 대상으로 예방접종 당일부터 4일후까지 발적, 동통, 발열, 두통 등 상대적으로 흔한이상반응의 발생빈도 등을 전향적으로 추적 관찰하였다. 결과: 대상 소아의 평균 연령은 사백신이 1.4세(1-8.5), 생백신이 1.7세(1-8.3)였다. 그 중 보건소에서 사백신을 접종받았던 어린이는 425명(64.6%)이었으며 소아과 의원에서 생백신을 접종받은 경우는 233명(35.4%)이었다. 사백신의 경우 전체 접종 어린이 중 3.3%인 14명이 한 가지 이상의 국소 이상 반응이 나타났으며, 생백신 접종 어린이들의 2.6%가 한 가지이상의 국소 이상반응을 호소하였다. 이러한 차이는 통계적으로 유의한 수준은 아니었다(P =.607). 발열 등의 전신반응의 경우 사백신과 생백신 접종 어린이들의 각각 5.2%와 8.2%에서 나타났으나 역시 유의한 수준의 차이는 아니었다(P =.131). 사백신 접종 어린이들에서는 접종당일 발적이 4명(0.9%), 종창이 2명(0.7%), 동통이 7명(1.7%), 발열이 2명(0.5%) 나타났다. 반면 생백신 접종 어린이들의 경우 각각 4명(1.8%), 2명 (0.9%), 0명(0.0%), 6명(2.6%)에서 해당 증상을 호소하였다. 발열의 경우 통계적으로 유의하게 생백신 접종 어린이들에서 빈번하였다(P=.026). 발적, 종창, 동통, 발열 중 한 가지 이상 나타난 어린이들의 백분율은 사백신과 생백신 접종자들의 각각 3.3%와 5.2%였으며, 이는 유의한 수준의 차이는 아니었다(P =.243). 접종 1, 2, 3, 4일 후 주요 국소 및 전신 이상반응 발생빈도는 사백신과 생백신에서 유의한 차이를 보이지는 않았다. 이상반응의 세부 항목 중에서는 설사 증상만이 생백신접종 어린이들에서 유의하게 많이 나타났다(P =.044). 결 론 : 본 연구에서는 일본뇌염백신의 이상반응 발생률이 이전의 보고보다 낮았고, 접종 당일 사백신 접종자들에 비해 생백신 접종자들에서 발열이 빈번하게 관찰되었다. 그 외 사백신과 생백신의 이상반응 발생에 뚜렷한 차이가 없었다. 그러나 사백신의 경우 향후 더 많은 수의 인구 표본을 대상으로 안전성에 대한 전향적 연구가 필요하며, 생백신의 경우 안전성에 대한 객관적 경험이 더 축적되어야 할 것으로 생각된다. 아울러 가장 문제가 되고 있는 중증이상반응의 발생을 확인하기 위해서는 대규모 표본을 대상으로 지속적인 감시활동이 필요할 것으로 사료된다.

• Journal of Microbiology and Biotechnology
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• 제32권11호
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• pp.1396-1405
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• 2022

Cholera remains a major global public health problem, for which oral cholera vaccines (OCVs) being a valuable strategy. Patients, who have recovered from cholera, develop antibody responses against LPS, cholera toxin (CT), toxin-coregulated pilus (TCP) major subunit A (TcpA) and other antigens; thus, these responses are potentially important contributors to immunity against Vibrio cholerae infection. However, assessments of the efficacy of current OCVs, especially inactivated OCVs, have focused primarily on O-antigen-specific antibody responses, suggesting that more sophisticated strategies are required for inactivated OCVs to induce immune responses against TCP, CT, and other antigens. Previously, we have shown that the toxT-139F allele enables V. cholerae strains to produce CT and TCP under simple laboratory culture conditions. Thus, we hypothesized that V. cholerae strains that express TCP via the toxT-139F allele induce TCP-specific antibody responses. As anticipated, V. cholerae strains that expressed TCP through the toxT-139F allele elicited antibody responses against TCP when the inactivated bacteria were delivered via a mouse model. We have further developed TCP-expressing V. cholerae strains that have been used in inactivated OCVs and shown that they effect an antibody response against TcpA in vivo, suggesting that V. cholerae strains with the toxT-139F allele are excellent candidates for cholera vaccines.

• Clinical and Experimental Vaccine Research
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• 제13권2호
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• pp.155-165
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• 2024

Purpose: Pertussis bacteria have many pathogenic and virulent antigens and severe adverse reactions have occurred when using inactivated whole-cell pertussis vaccines. Therefore, inactivated acellular pertussis (aP) vaccines and genetically detoxified recombinant pertussis (rP) vaccines are being developed. The aim of this study was to assess the safety profile of a novel rP vaccine under development in comparison to commercial diphtheria-tetanus-acellular pertussis (DTaP) vaccines. Materials and Methods: The two positive control DTaP vaccines (two- and tri-components aP vaccines) and two experimental recombinant DTaP (rDTaP) vaccine (two- and tri-components aP vaccines adsorbed to either aluminum hydroxide or purified oat beta-glucan) were used. Temperature histamine sensitization test (HIST), indirect Chinese hamster ovary (CHO) cell cluster assay, mouse-weight-gain (MWG) test, leukocytosis promoting (LP) test, and intramuscular inflammatory cytokine assay of the injection site performed for safety assessments. Results: HIST results showed absence of residual pertussis toxin (PTx) in both control and experimental DTaP vaccine groups, whereas in groups immunized with tri-components vaccines, the experimental tri-components rDTaP absorbed to alum showed an ultra-small amount of 0.0066 IU/mL. CHO cell clustering was observed from 4 IU/mL in all groups. LP tests showed that neutrophils and lymphocytes were in the normal range in all groups immunized with the two components vaccine. However, in the tri-components control DTaP vaccine group, as well as two- and tri-components rDTaP with beta-glucan group, a higher monocyte count was observed 3 days after vaccination, although less than 2 times the normal range. In the MWG test, both groups showed changes less than 20% in body temperature and body weight before the after the final immunizations. Inflammatory cytokines within the muscle at the injection site on day 3 after intramuscular injection revealed no significant response in all groups. Conclusion: There were no findings associated with residual PTx, and no significant differences in both local and systemic adverse reactions in the novel rDTaP vaccine compared to existing available DTaP vaccines. The results suggest that the novel rDTaP vaccine is safe.

• IMMUNE NETWORK
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• 제5권2호
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• pp.55-67
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• 2005

Cancer vaccine is an active immunotherapy to stimulate the immune system to mount a response against the tumor specific antigen. Working as a stimulant to the body's own immune system, cancer vaccines help the body recognize and destroy targeted cancers and may help to shrink advanced tumors. Research is currently underway to develop therapeutic cancer vaccines. It is also possible to develop prophylactic vaccines in the future. The whole cell approach to eradicate cancer has used whole cancer cells to make vaccine. In an early stage of this approach, whole cell lysate or a mixture of immunoadjuvant and inactivated cancer cells has been used. Improved vaccines are being developed that utilize cytokines or costimulatory molecules to mount an attack against cancer cells. In case of melanoma, these vaccines are expected to have a therapeutic effect of vaccine. Furthermore, it is attempting to treat stomach cancer, colorectal cancer, pancreatic cancer, and prostate cancer. Other vaccines are being developing that are peptide vaccine, recombinant vaccine and dendritic cell vaccine. Out of them, reintroduction of antigen-specific dendritic cells into patient and DNA vaccine are mostly being conducted. Currently, research and development efforts are underway to develop therapeutic cancer vaccine such as DNA vaccine for the treatment of multiple forms of cancers.

• 대한바이러스학회지
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• 제26권2호
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• pp.245-249
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• 1996

Hantaan virus vaccine was developed in 1988 and proved effective. This vaccine is a kind of inactivated vaccine, stable for two years when stored at $2-8^{\circ}C$. Almost virus vaccines including Hantaan virus vaccine are produced and kept in fluid state, and the immumogenicity can be easily destroyed at room temperature or at higher temperature. Therefore the vaccines should be kept in the refrigerator to maintain the immunogenicity. In this study, glucose and/or lactose was added as a stabilizer into Hantaan virus vaccine to increase the stability and dried in vaccum with ethanol treatment. 5% glucose and or lactose in Hantaan virus vaccine most effectively increased the stability of vaccine and maintained the immunogenicity at least for three months at room temperature. But drying with ethanol treatment did not help increasing the stability. These results suggest that glucose and lactose could be good stabilizer of virus vaccines.

• BMB Reports
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• 제44권4호
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• pp.232-237
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• 2011

Human respiratory syncytial virus (HRSV) is a major cause of upper and lower respiratory tract illness in infants and young children worldwide. Despite its importance as a respiratory pathogen, there is currently no licensed vaccine for prophylaxis of HRSV infection. There are several hurdles complicating the development of a RSV vaccine: 1) incomplete immunity to natural RSV infection leading to frequent re-infection, 2) immature immune system and maternal antibodies of newborn infants who are the primary subject population, and 3) imbalanced Th2-biased immune responses to certain vaccine candidates leading to exacerbated pulmonary disease. After the failure of an initial trial featuring formalin-inactivated virus as a RSV vaccine, more careful and deliberate efforts have been made towards the development of safe and effective RSV vaccines without vaccine-enhanced disease. A wide array of RSV vaccine strategies is being developed, including live-attenuated viruses, protein subunit-based, and vector-based candidates. Though licensed vaccines remain to be developed, our great efforts will lead us to reach the goal of attaining safe and effective RSV vaccines in the near future.

• Clinical and Experimental Pediatrics
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• 제55권9호
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• pp.309-315
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• 2012

Human respiratory syncytial virus (HRSV) is a major cause of severe respiratory tract illnesses in infants and young children worldwide. Despite its importance as a respiratory pathogen, there is currently no licensed vaccine for HRSV. Following failure of the initial trial of formalin-inactivated virus particle vaccine, continuous efforts have been made for the development of safe and efficacious vaccines against HRSV. However, several obstacles persist that delay the development of HRSV vaccine, such as the immature immune system of newborn infants and the possible Th2-biased immune responses leading to subsequent vaccine-enhanced diseases. Many HRSV vaccine strategies are currently being developed and evaluated, including live-attenuated viruses, subunit-based, and vector-based candidates. In this review, the current HRSV vaccines are overviewed and the safety issues regarding asthma and vaccine-induced pathology are discussed.

• 대한수의학회지
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• 제16권1호
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• pp.45-51
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• 1976

Hematological studies were conducted in reference to the immune enhancing mechanism of formalin applied to, as an inactivating agent, a formalin inactivaed anthrax vaccines in rabbits. Rabbits were inoculated two types of formalinized anthrax immunogens namely capsular and spore vaccines in addition of formalin saline as a control. From immune rabbits, peripheral blood was collected and subjected to count a total erythrocytes, leukocytes, and pyroninophilic lymphocytes. The experimental results were summarized as followings. At a level of 0.5M 0.5ml formalin with or without the addition to vaccine, a total leukocytes count was increased. Due to the increased lymphocytes, the ratio of neutrophil and lymphocyte was lowered within 4 to 12 hours of the postinoculation. Formalin saline, anthrax spore vaccine and capsular vaccine, without group difference, caused an increased level of pyroninophilic lymphocytes in peripheral blood. Throughout the studies, a possible role of immune enhancement by formlin was disscused and suggested.