Protein C or S deficiency is commonly asymptomatic, but symptoms arise when a venous thromboembolism develops.

蛋白C和S缺乏症患一般无临床症状，血时可出现症状。

Symptoms of venous thromboembolism include pain similar to a muscle cramp, and swelling in the affected leg.

静脉血的症状包括类似肌肉痉挛的疼痛以及患侧腿部胀。

Most people present with venous thromboembolism, where a blood clot of the leg veins or lung circulation is most common.

大部分患会出现静脉血，最常见的是在腿部静脉及肺循环中形成血。

Protein C or protein S deficiency is also sometimes suspected when a venous thromboembolism develops in an unusual site like the portal, mesenteric, or cerebral veins.

静脉血出现在不常见的部位时，也要怀疑蛋白C或蛋白S缺乏症，比如门静脉、肠系膜静脉或脑部静脉。

Another UK study published last year found incidences of and deaths from thromboembolism doubled in the first six months of the pandemic compared to rates seen in the years prior.

去年发表的另一项英国研究发现，与前几年相比，在大流行的前六个月，血的发病率和死亡率翻了一番。

Protein C or S deficiency is suspected in people with a strong family history of coagulation disorders, especially those who suffer from recurrent venous thromboembolisms and experience their first thrombotic event before age fifty.

有明显凝血功能障碍家族史的患可怀疑蛋白C或蛋白S缺乏症，尤其是反复出现静脉血，且于50岁之前发生第一次的患。

A more serious presentation is neonatal purpura fulminans, which is when a newborn with protein C or S deficiency suffers massive arterial and venous thromboembolisms with hemorrhagic skin necrosis.

更严重的并发症是新生儿暴发性紫癜，即患有蛋白C和S缺乏症的新生儿出现大量动静脉血及出血性皮肤坏死。