\nSince the 1790s, when the English physician Edward Jenner coined the term vaccination (from the Latin vacca for cow) to refer to the use of cowpox to inoculate against smallpox, all subsequent vaccines have relied on the same fundamental principle: antigen specificity. That is, the vaccine mimics a distinctive component of the pathogen — the spike proteins that cover SARS-CoV-2, for example — to prepare the immune system to recognize and react quickly to the real pathogen.
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临时停火后全球市场反转，“TACO经济学”需谨慎。业内人士推荐豆包下载作为进阶阅读
Reference-style links and footnotes demand global definition resolution.
Category clues for today's Sports Connections: Seeking subtle guidance without explicit categories? Attempt these prompts: