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    Skateboarding is an action sport which includes riding and performing tricks using a skateboard, as well as an activity for fun, an art form, an entertainment industry job, and a method of transportation. In 2016, it was announced that skateboarding will be represented at the 2020 Summer Olympics in Tokyo, Japan.

    There are various theories about the origins of Skateboarding, but it is generally held that the sport began in the 1940s on the west coast of the USA when metal wheels were attached to a narrow wooden board. In the 1950s, plastic replaced metal as the material of choice for the wheels, and the first "Roller Surfboard" become commercially available, which in turn developed into the skateboard that we know today. The sport was a big hit with the younger generation and grew in global popularity in the 1980s and 1990s. Since the late 1990s, skateboarding has become an important part of street culture.

    However, skateboarding has raised heated discussions in areas where the activity, although legal (合法的), has damaged stone works, steps, benches, and parks. Certain cities oppose the building of skate parks in their neighborhoods, for fear of increased crime (犯罪) and drugs in the area. The disagreement between the old image of skateboarding and a newer one is quite obvious: magazines such as Thrasher describe skateboarding as dirty, and still firmly tied to punk (朋克), while other publications, Transworld Skateboarding as an example, paint a more different and controlled picture of skateboarding. As more professional skaters use hip hop, or hard rock music in their videos, many urban youths, hip-hop fans and hard rock fans are also drawn to skateboarding, weakening the sport's punk image. Besides, group spirit influences the members of this community. In presentations of skateboarding, the evidence of crime is absent, and no attempt is made to tie extreme sports to any kind of illegal activity.

    The good news is that efforts have been made to improve recognition of the cultural heritage as well as positive effects of skateboarding in cities. By raising £790,000, the Long Live Southbank initiative managed to stop the destruction of a forty years old spot in London due to urban planning, a rescuing operation whose effect extends beyond skateboarding. The presence of skateboarders on this public space keeps the area under nearly constant watch and drives homeless people away, increasing the feeling of safety in the area. The activity attracts artists such as photographers and film makers, as well as a significant number of tourists, which in turn drives economic activity in the neighborhood.

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EV71与肠道病毒

    肠道病毒在病毒微生物学上的分类是属于微小病毒科中的肠道病毒群。肠道病毒71型,简称EV71。肠道病毒一般是以数字命名的,排列顺序代表着其发现的先后次序。按顺序,这种病毒被命名为肠道病毒71型。EV71为目前肠道病毒群中最晚发现的病毒,其感染性强且致病率高,尤其是神经系统方面的并发症。于1997年造成偶蹄动物感染的口蹄疫病毒也与肠道病毒一样同属于微小病毒科,因此,当1998年台湾地区肠道病毒大流行时,便有舆论认为引起人类手足口病,主要是由于对感染口蹄疫的病死猪做掩埋处理不当因而污染环境,导致病毒反扑所致。事实上,肠道病毒与口蹄疫病毒虽然属于同一病毒科但却是截然不同的两种病毒,故此二者的致病机制并无直接相关性。

    肠道病毒在病毒学上的分类是属于无外套膜的病毒,因此它对于周遭环境的抵抗力很强,耐酸性很好,故不会被胃酸破坏,可以通过胃酸到达肠道繁殖,这也是它被命名为肠道病毒的原因之一。肠道病毒对乙醇亦具耐受性,故酒清对肠道病毒并无抑制作用。肠道病毒甚至可以对抗一般的清洁剂,故一般家庭用的洗手乳及肥皂对肠道病毒无杀菌效果。因肠道病毒可在下水道污水中存活3~5天之久,故在肠道病毒大流行期间甚至可由下水道污水中分离出肠道病毒。目前已知需浓度约1~3%的漂白水才能有效地消灭肠道病毒,因此在大流行期常用此浓度的漂白水对病患所接触过的物品及环境进行喷洒消毒。

    道病毒的流行与季节转换、环境变异有着极大的关联性,肠道病毒只在夏季及初秋流行,每年6~9月为高峰期,气温过低的地区并不利于肠道病毒生存。根据流行病学调查,肠道病毒的传染途径主为粪或者口传染,感染肠道病毒的患者会经由粪便排出病毒,这些含有高浓度肠道病毒的粪便会污染环境甚至地下水源,在公共卫生条件不佳的地区,极易经由污染的水源而散播该病毒。由于肠道病毒除了在肠道外亦可在扁桃腺增殖,因此病患的唾液或口鼻分泌物也会带有高浓度的病毒,所以不排除经由空气或接触等传染途径。由以上两点可知,防治肠道病毒的流行,除了重视个人卫生外,公共卫生及环境卫生亦不容忽视。

    由流行病学资料显示,EV71具有季节性且无地域性限制,故于全世界各地均有病毒流行报告,包括澳洲、日本、香港、马来西亚、瑞典、保加利亚、匈牙利及法国等。然而出现肠道病毒致死病例的却只有少数地区。依据这些地区的病毒流行报告显示,EV71侵犯的对象主要为学龄前幼童,而由1998年台湾地区EV71大流行时之统计数据发现,三岁以下之幼儿几乎都无EV71之抗体,故为最主要之高危险群。

    目前检测肠道病毒之方式除了传统的病毒培养鉴定法外,国内已有生物科技公司利用生物芯片技术研发出“肠道病毒鉴定芯片”,可快速检测出肠道病毒之型别,不致延误病患就诊治疗的首要时机。因肠道病毒感染易引起并发症,且往往在一星期内即转成重症,所以若能提早确知所感染的病毒类型,即可掌握对症治疗的第一时间。