Prevalence and seroepidemiology of <i>Haemophilus parasuis</i> in Sichuan province, China

Wang, Zhenghao; Zhao, Qing; Wei, Hailin; Wen, Xiaopeng; Cao, Sanjie; Huang, Xiaobo; Wu, Rui; Yan, Qigui; Huang, Yong; Wen, Yiping

doi:10.7287/peerj.preprints.2805

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“…Strains belonging to serovar 7 were considered to have low virulence potential since the G. parasuis serovar 7 reference strain 174 was unable to cause disease in piglets (Kielstein and Rapp-Gabrielson, 1992;Brockmeier et al, 2014). However, outbreaks of Glässer's disease with serovar 7 strains in swine herds in China (Wang et al, 2017) and Brazil (Prigol et al, 2022) have since been recorded. Furthermore, experimentally challenging pigs with G. parasuis serovar 7 reference strain 174 has been shown to result in the classic symptoms of Glässer's disease (Frandoloso et al, 2015;Guizzo et al, 2018;Frandoloso et al, 2020;Dazzi et al, 2020).…”

Section: Limitations Of Bacterins and Conjugate Capsular Vaccinesmentioning

confidence: 99%

Insights from targeting transferrin receptors to develop vaccines for pathogens of humans and food production animals

Ewasechko

Chaudhuri²,

Schryvers³

2023

Front. Cell. Infect. Microbiol.

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While developing vaccines targeting surface transferrin receptor proteins in Gram-negative pathogens of humans and food production animals, the common features derived from their evolutionary origins has provided us with insights on how improvements could be implemented in the various stages of research and vaccine development. These pathogens are adapted to live exclusively on the mucosal surfaces of the upper respiratory or genitourinary tract of their host and rely on their receptors to acquire iron from transferrin for survival, indicating that there likely are common mechanisms for delivering transferrin to the mucosal surfaces that should be explored. The modern-day receptors are derived from those present in bacteria that lived over 320 million years ago. The pathogens represent the most host adapted members of their bacterial lineages and may possess factors that enable them to have strong association with the mucosal epithelial cells, thus likely reside in a different niche than the commensal members of the bacterial lineage. The bacterial pathogens normally lead a commensal lifestyle which presents challenges for development of relevant infection models as most infection models either exclude the early stages of colonization or subsequent disease development, and the immune mechanisms at the mucosal surface that would prevent disease are not evident. Development of infection models emulating natural horizontal disease transmission are also lacking. Our aim is to share our insights from the study of pathogens of humans and food production animals with individuals involved in vaccine development, maintaining health or regulation of products in the human and animal health sectors.

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