None of the patients had signs of rabies infection, even though 18 months had passed since their transplants. Before these cases, researchers thought that rabies transmission after transplantation would be rapid, occurring within six weeks. People who receive transplants typically take drugs to suppress (抑制) their immune systems,

　　making infections even more likely.

　　The three patients received rabies treatment, and still show no signs of illness. It's possible that the type of rabies virus that infected these patients takes a longer time to make people sick,

　　the researchers said.

　　Patients may also have been exposed to a low dose of the virus. The report raises questions about how rabies viruses spread after transplantation，and where they live in the body when the infection is not active,

　　said the

　　researchers from the

　　Centers

　　for Disease Control and Prevention.

　　Because rabies infections are so rare, screening all organ donors for rabies infections is not practical, the researchers said. However, doctors should develop

　　a plan to help them recognize infectious encephalitis — a brain infection that can be caused by rabies — in donors. Organs from donors with infectious encephalitis should only be used in extreme circumstances, the researchers said.

　　The donor in this case frequently engaged in hunting and animal trapping, and had got many bites from a raccoon(浣熊) before his death.

【2017届高考英语一轮复习同步训练：2-2《The Olympic Games》】相关文章：

★ 2017高考四川省广安市英语阅读理解一轮系列训练：23（含解析）

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ规范练：5（含解析）

★ 【北师大版】2014届高考英语一轮复习指导课时作业：Unit 3 A卷 Word版含解析

★ 【优化方案】2017届高考英语二轮复习全国卷Ⅱ题型重组训练：第11组（含解析）

★ 安徽省淮南市2014高考英语一轮单项选择及文章训练（6）及答案

★ 【浙江专用】2014届高考英语一轮复习课时作业(四十)选修8Unit 5《Meeting your ancestors》

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (24)

★ 北京市2014高考英语一轮复习 练习手册（40）选修8 Unit 5 Meeting your ancestors（含解析）新人教版

★ 湖南省汝城二中2014届高考英语一轮复习阅读训练 (59)

★ 2017届高考英语二轮复习大题冲关秘籍完形填空之夹叙夹议文：考纲分析（含解析）