Because of the pandemic nature of the infection , the benefits from inoculation operate on an individual level only .
因为传染病具有流行的本质，接种带来的好处仅是就个人而言。
Plants could be genetically engineered to produce vaccines in their edible parts , which could then be eaten when inoculation is needed .
植物可以通过遗传工程在它们可吃的部分生产疫苗，这样需要接种的时候直接可以吃。
Structural factors : the research showed that factors such as cost and access to vaccines would prevent some people from seeking inoculation .
构成因素：研究表明费用及疫苗获得等方面因素会制约一些人希望获得接种的愿望。
Article 85 people coming from a yellow fever prevalent area are required to present valid certificate of inoculation against yellow fever to the health and quarantine organ upon entry .
第八十五条来自黄热病疫区的人员，在入境时，必须向卫生检疫机关出示有效的黄热病预防接种证书。
" When few of these men became infected , the research approach changed to direct inoculation of soldiers , prisoners and mental hospital patients , " background documents on the study show .
