首次受到结核菌感染就叫初次感染,其馀进程为后初次感染(post-primary infection)。,此时少数结核菌常常隐伏著,没有被杀死,也不会增殖或引起活动 性结核病。
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目的通过观察2型登革病毒(DEN2)NGC株初次感染和再次感染BALB/c小鼠后小鼠血浆中TH1和TH2类细胞因子的产生及其动态变化,研究DEN2感染的免疫机制。
Objective:To observe the dynamic levels of TH1/TH2 cytokines from the plasma of BALB/c mice infected with DEN2 NGC strain and research immune response mechanism.
食物中毒是会产生难以置信的后果:大肠杆菌(e.c oli)感染和某些其他食源性疾病有时在初次发病愈后数月甚至数年还能导致严重的疾病。
It's a dirty little secret of food poisoning: E. coli and certain other foodborne illnesses can sometimes trigger serious health problems months or years after patients survived that initial bout.
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