Biological Hazard in Food – Parasites 食物中的生物危害：寄生虫

广东疾控 · 公众号 · 养生 · 2017-03-22 21:35

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原虫

Similar to bacteria, protozoa are single cell organisms and generally can be seen under light microscope. Yet, they are not able to multiply in food but in humans. Some protozoa produce cysts (closed sacs), which can resist destruction by gastric juice in stomach and help protozoa to transmit in food or environment. Infective dose is generally believed to be low and some protozoa may only require a few cysts to cause disease. Toxoplasma gondii and Giardia lamblia are common protozoa found in raw or undercooked meat and contaminated water respectively.

原虫与细菌相似，是单细胞生物，通常在光学显微镜下让人看见 。虽然原虫不能在食物中生长，但却能够在人体内繁殖。部分原虫会产生包囊，让其免被胃部内的胃液杀死，令原虫能够在食物或环境中传播。一般相信只需很少数目便可引致原虫感染，部分原虫可能只需数个包囊便可令人患病。 生或未经彻底煮熟的肉类中的弓形虫和受污染的水中的蓝氏贾第鞭毛虫都是常见的原虫。

Helminths

蠕虫

Helminths are larger organisms that compose of multiple cells and can vary a lot in size; some can grow up to more than six meters long. In their adult form, helminths cannot multiply in humans. Common helminths found in food are shown below: