腹股沟疝，经疝修补术后，伤口抗拉力强度达到顶点的时间为（）
A.1周
B.2周
C.1个月
D.2个月
E.3个月
参考答案：E
解析：手术伤口表皮再生在24～48小时内便可将伤口覆盖，肉芽组织在第3天可从伤口边缘长出并很快将伤口填满，5～7天伤口两侧出现胶原纤维连接，第2周末瘢痕开始"变白"，1个月后覆盖切口的表皮结构已基本正常，纤维结缔组织仍富于细胞，胶原组织不断增多，抗拉力强度在3个月达到顶峰，切口数月后形成一条白色线状瘢痕。
| Smallpox was the first widespread disease to be eliminated by human intervention. A highly contagious viral disease, it was endemic in Europe, causing the death of millions of people until the development of vaccination by Edward Jenner around 1800. In many non- European nations, it remained a dreaded, often fatal illness until very recently. In May 1966, the World Health Organization (WHO), an agency of the United Nations, was authorized to initiate a global campaign to eradicate smallpox. The goal was to eliminate the disease in one decade. At the time, the disease posed a serious threat to people in thirty nations. More than 700 physicians, nurses, scientists, and other personnel from WHO joined about 200,000 health workers in the infected nations to battle the disease. Because similar projects for malaria and yellow fever had failed, few believed that smallpox could actually be eradicated, but eleven years after the initial organization of the campaign, no cases were reported in the field. The strategy was not only to provide mass vaccinations but also to isolate patients with active smallpox in order to contain the spread of the disease and to break the chain of human transmission. Rewards for reporting smallpox assisted in motivating the public to aid health workers. One by one, each smallpox victim was sought out, removed from contact with others and treated. At the same time, the entire village where the victim had lived was vaccinated. By April 1978, WHO officials announced that they had isolated the last known case of the disease, but health workers continued to search for new cases for two additional years to be completely sure. In May 1980, a formal statement was made to the global community. Today smallpox is no longer a threat to humanity. Routine vaccinations have been stopped worldwide. |
The word "threat" underlined in Paragraph 2 means ______ .
A．debate
B．humiliation
C．risk
D．bother