2025 (1)
大規模的新冠疫苗接種開始了。給新冠流行早日得到控製,日常生活早日恢複正常帶來希望。同時也引起一些擔心。有些是因為對此病毒的特性,mRNA 疫苗 的了解不足。這需要科學界繼續努力。有些是因為民眾對基本的病毒感染,免疫反應知之有限,加上媒體上一些有意無意的誤導。舉幾個例子:
1, 有人擔心,疫苗接種後,抗體隻能存在幾個月,沒有長期保護作用。其實,任何一種特異性抗體的半衰期也就是幾周。產生,分泌此抗體的漿細胞,在沒有抗原和其它輔助因子刺激下,不久就休眠了。但是記憶細胞會在抗原再次進入時被激活,產生抗體。
2,常常有人把疫苗接種後,局部的紅腫酸疼,體溫升高等都說成但是接種的副作用。其實這些正是疫苗接種的效果。
謝謝來訪。
People who recover from COVID-19 sometimes later test positive for SARS-CoV-2, suggesting their immune systems could not ward off a second attack by the coronavirus or that they have a lingering infection. A study now hints at a different explanation in which the virus hides in an unexpected place. The work, only reported in a preprint, suggests the pandemic pathogen takes a page from HIV and other retroviruses and integrates its genetic code—but, importantly, just parts of it—into people’s chromosomes. The phenomenon, if true and frequent, could have profound implications that range from false signals of active infection to misleading results from COVID-19 treatment studies.
The current study only showed this integration in a lab dish, although it also cites published sequence data from humans infected with SARS-CoV-2 that suggest it has happened. The authors emphasize that their results don’t imply that SARS-CoV-2 establishes permanent genetic residence in human cells to keep pumping out new copies, as HIV does.