这是我从connell feline health center 转过来的文章.我只转大家比较感兴趣的关于人从猫感染到弓型虫的部分.有兴趣的可以去看原文
http://www.vet.cornell.edu/fhc/brochures/toxo.html
没时间全读的同学,我就说重要的几点:
1.猫一生中只有几天会排虫卵
2.猫毛上通常不携带虫卵
3.猫通常在初次感染弓型虫后3-10天内开使排虫卵(通过粪便),持续大约10-14天.
4.猫刚排出的虫卵没有感染性,虫卵需要1-5天的孵育时间后才能感染人或其他的动物

(ZT)
What causes toxoplasmosis?
The life cycle of Toxoplasma gondii is complex and involves two types of host—definitive and intermediate. Cats, both wild and domestic, are the only definitive hosts for Toxoplasma gondii. This means that the parasite can only produce oocysts (eggs) when infecting a cat. When a cat ingests an infected prey (or other infected raw meat) the parasite is released into the cat’s digestive tract. The organisms then multiply in the wall of the small intestine and produce oocysts during what is known as the intraintestinal infection cycle. These oocysts are then excreted in great numbers in the cat’s feces. Cats previously unexposed to T. gondii will usually begin shedding oocysts between three and 10 days after ingestion of infected tissue, and continue shedding for around 10 to 14 days, during which time many millions of oocysts may be produced. Oocysts are very resistant and may survive in the environment for well over a year.

Other animals, including humans, are intermediate hosts of Toxoplasma gondii. These hosts can become infected but do not produce oocysts. Oocysts passed in a cat’s feces are not immediately infectious to other animals. They must first go through a process called sporulation, which takes one to five days depending on environmental conditions. Once sporulated, oocysts are infectious to cats, people, and other intermediate hosts. Intermediate hosts become infected through ingestion of sporulated oocysts, and this infection results in formation of tissue cysts in various tissues of the body. Tissue cysts remain in the intermediate host for life and are infectious to cats, people and other intermediate hosts if the cyst-containing tissue is eaten.
Can I “catch” toxoplasmosis from my cat?
Because cats only shed the organism for a few days in their entire life, the chance of human exposure is small. Owning a cat does not mean you will be infected with the disease. It is unlikely that you would be exposed to the parasite by touching an infected cat, because cats usually do not carry the parasite on their fur. It is also unlikely that you can become infected through cat bites or scratches. In addition, cats kept indoors that do not hunt prey or are not fed raw meat are not likely to be infected with T. gondii.
In the United States, people are much more likely to become infected through eating raw meat and unwashed fruits and vegetables than from handling cat feces.
商榷一下：咪呜
我完全同意你的话，“希望喜欢猫的不要被吓着了”。这实在不是那个帖子的本意。
但任何事情，讲卫生，注意一些，一定是好的。比如，现在，病毒学家说，唾液中没有乙肝病毒。那么，你敢和一个乙肝患者或处在活动期的携带者接吻吗？你会说，不敢，因为有可能因口腔粘膜有破损而血液传播。但这是没有意义的回答，因为实际的结果是一样的，即我们不敢和这样的人接吻。
所以我说，在战略上渺视它，在战术上重视它。我写这个帖子，是告诉大家怎样注意卫生，以免出问题而追悔莫及。但不是要引起恐慌。
我的那个帖子，基本上基于一本比利时相关部门出的一本小册子以及一些相关杂志和跟我的vet的交谈。我曾经拿着这个册子问我的vet,他笑说，看得晚上做恶魔了吧？但那是极端的情况。只要注意些就可以了。
以下是回答：
1.猫一生中只有几天会排虫卵：这没有任何实际意义。
2.猫毛上通常不携带虫卵：这和我看到的资料完全不同。
3.猫通常在初次感染弓型虫后3-10天内开使排虫卵(通过粪便),持续大约10-14天：这已经说明了一切。
4.猫刚排出的虫卵没有感染性,虫卵需要1-5天的孵育时间后才能感染人或其他的动物：这还不够了吗？你怎么知道你是落在哪一天？
在国外，卫生条件比较好，被传染的几率比较低，但这不意味着我们要不讲卫生。大家难道不知道在中国，有个女孩子因为养猫，又不注意卫生，身体内，头脑里，都是蛔虫团，后来，好不容易才治好的事吗？这事还惊动了韩国大使夫人！