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| The large study, published in The BMJ, looked at health data from 1,057,174 positive COVID-19 cases. This covers every single positive recorded case in Sweden from the beginning of the pandemic up to May 2021. A control group of four million age- and sex-matched subjects not positive with COVID was generated to quantify the increase in risk for blood clots caused by infection.这项研究样本庞大，对1057174新冠病毒阳性感染者的健康数据进行了分析，涵盖了瑞典从疫情暴发以来到2021年5月的所有阳性感染者。研究设置了一个对照组，从而量化感染新冠导致的血栓风险增加程度，对照组由400万年龄和性别相仿的受试者组成，这些受试者的新冠病毒检测结果未呈阳性。该研究发表在《英国医学杂志》上。 |
| Factoring in acute disease severity, the researchers found those initially hit hardest with COVID-19 did experience greater long-term risk for blood clotting events. However, the increased risk was not zero in those experiencing mild COVID. Those with only a mild infection still showed a three-fold risk of DVT and a seven-fold risk of pulmonary embolism.研究人员发现，重症感染者血栓形成的风险更大。但轻症感染者血栓形成的风险也有所增加。轻症患者的深静脉血栓形成风险增加3倍，而肺栓塞风险增加7倍。 |
| That study more generally found significant increases in rates of stroke, heart attack and blood clotting a month after a COVID infection. It also found these rates of adverse events were much higher after COVID-19 than after vaccination, validating the suggestion that the deleterious after-effects of COVID-19 are much more impactful than any potential harms caused by vaccination.该研究更普遍地发现，在感染新冠一个月后，中风、心脏病发作和血栓的发生率显著增加。研究还发现，在感染新冠后，这些疾病的发生率要比接种疫苗之后高得多，这验证了新冠后遗症的危害比接种疫苗造成的任何潜在危害的影响更大的观点。 |
| Ioannis Katsoularis, an author on the new Swedish study from Umeå University, said the findings affirm the value of vaccination in reducing the likelihood and severity of COVID-19. 该最新研究的论文作者，瑞典于默奥大学的伊奥尼斯·卡苏拉里斯称，这些研究结果肯定了疫苗接种在降低感染风险和减少重症方面的价值。 |
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