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Are acellular vaccines driving the rise of pertactin-deficient Bordetella pertussis

无细胞疫苗是否会导致缺乏百日咳博德特氏菌的增加

基本信息

批准号：
10364771
负责人：
Eric T Harvill
金额：
$ 18.88万
依托单位：
UNIVERSITY OF GEORGIA
依托单位国家：
美国
项目类别：
财政年份：
2021
资助国家：
美国
起止时间：
2021-03-04 至 2023-02-28
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10364771
关键词：
Acellular Vaccines Address Animals Antigens Attenuated Automobile Driving Bacteria Bacterial Adhesins Biological Biological Assay Bordetella Bordetella bronchiseptica Bordetella pertussis Centers for Disease Control and Prevention (U.S.)Cessation of life Child Complex Consensus Costs and Benefits Country Data Disease Dose Educational workshop Etiology Evolution Flushing Grant Growth High Prevalence Human Immune response Immunity In Situ Incidence Infant Infection Investigation Lung Measurable Measures Modeling Mus Newborn Infant Pathogenesis Pathology Pertussis Pertussis Vaccine Prevalence Process Proteins Pulmonary Pathology Respiratory System Role Symptoms System Time United States United States National Institutes of Health Vaccinated Vaccination Vaccine Antigen Vaccines co-infection cost expectation experimental study fitness immunogenic in vivo innovation mouse model mutant novel pathogen pertactin pressure prevent respiratory pathogen response transmission process unvaccinated vaccine-induced immunity

项目摘要

PROJECT SUMMARY Bordetella pertussis, the respiratory pathogen responsible for “whooping cough,” causes an estimated 24 million cases of vaccine-preventable illness per year, resulting in an excess of 200,000 deaths annually. Importantly, the incidence of whooping cough in nations with high vaccine coverage is on the rise and has been recognized by both the CDC and NIH as a priority (re)emerging infectious pathogen of high concern. The flawed immunity conferred by acellular pertussis vaccines has been highly implicated in the re-emergence of whooping cough. Although acellular vaccines are reasonably effective in preventing severe disease, resultant immunity quickly wanes, and does not effectively prevent asymptomatic colonization or transmission of B. pertussis from vaccinated hosts to susceptible newborns. Rather than killed or attenuated bacteria, these vaccines are composed of 3-5 immunogenic proteins, notably, pertactin, a bacterial autotransporter that is now disrupted or absent in 85% of circulating strains in the United States. Bacterial adaptation in response to vaccine-driven pressure is suspected to have selected for pertactin-deficient strains, which may enable the bacterium to evade host immunity directed against pertactin. The high prevalence of pertactin deficient strains in the United States is taken as confirmatory evidence, but there is little robust experimental evidence to support or refute this hypothesis. More importantly, without clear experimental evidence, there is no consensus on how to respond, leaving the CDC and NIH to launch workshops and panels to try to tackle and understand the problem and consider possible solutions. Excitingly, we have developed a novel mouse model of natural infection that allows us, for the first time, to directly address vaccine driven selection for the loss of vaccine antigens, and here present preliminary data measuring the reduction in colonization and bacterial shedding from the nares of pertactin-deficient Bordetella bronchiseptica, a close ancestral relative of B. pertussis that naturally infects mice. Application of this model in vaccinated mice has generated preliminary data indicating that pertactin-deficient strains have an advantage in colonization and shedding from vaccinated hosts in comparison with wildtype B. bronchiseptica. These data are consistent with the expectation that pertactin deficiency measurably reduces fitness in unvaccinated hosts but increases fitness in vaccinated hosts. Therefore, we intend to employ our innovative mouse model to thoroughly investigate the role and effect of pertactin deficiency using representative isogenic B. pertussis strains. Together these experiments will provide the first direct evidence to either support or refute the controversial explanation of vaccine-driven evolution of B. pertussis, and thereby inform very different responses to the observed rise in incidence of disease and prevalence of circulating pertactin-deficient strains in countries with wide vaccine coverage.

项目总结

项目成果

期刊论文数量（13）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Modeling Immune Evasion and Vaccine Limitations by Targeted Nasopharyngeal Bordetella pertussis Inoculation in Mice.

DOI：
10.3201/eid2708.203566
发表时间：
2021-08
期刊：
Emerging infectious diseases
影响因子：
11.8
作者：
Soumana IH;Linz B;Dewan KK;Sarr D;Gestal MC;Howard LK;Caulfield AD;Rada B;Harvill ET
通讯作者：
Harvill ET

Probing Immune-Mediated Clearance of Acute Middle Ear Infection in Mice.

DOI：
10.3389/fcimb.2021.815627
发表时间：
2021
期刊：
Frontiers in cellular and infection microbiology
影响因子：
5.7
作者：
Dewan KK;Sedney C;Caulfield AD;Su Y;Ma L;Blas-Machado U;Harvill ET
通讯作者：
Harvill ET

The Neonatal Immune System and Respiratory Pathogens.

DOI：
10.3390/microorganisms11061597
发表时间：
2023-06-16
期刊：
Microorganisms
影响因子：
4.5
作者：
Sedney CJ;Harvill ET
通讯作者：
Harvill ET

Modeling the catarrhal stage of Bordetella pertussis upper respiratory tract infections in mice.

模拟小鼠百日咳博德特氏菌上呼吸道感染的卡他期。

DOI：
10.1242/dmm.049266
发表时间：
2022-05-01
期刊：
Disease models & mechanisms
影响因子：
4.3
作者：
Soumana IH;Dewan KK;Linz B;Rivera I;Ma L;Howard LK;Caulfield AD;Sedney CJ;Blas-Machado U;Sebo P;Harvill ET
通讯作者：
Harvill ET

Evolution and Conservation of Bordetella Intracellular Survival in Eukaryotic Host Cells.