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1. The Mishnah discusses the blood of Nochrim and the Tahor blood of female lepers.
2. The Mishnah discusses the blood of a woman who gave birth after her days of Tum'ah ended.
3. Rava: The Zav emission of a male Nochri is Tamei, even according to Beis Shamai.
4. The Keri of a Jew who has relations with a Nochris is Tamei, even though it is inside the Nochris.
5. The emission of a Zav, whether he is an adult or a minor, causes Tum'ah.
A BIT MORE
1. Beis Shamai: These bloods are Tahor. Beis Hillel: They are like her spit and urine. When they are wet they are Tamei (according to rabbinic decree), and when they are dry they are Tahor.
2. Beis Shamai: They are like her spit and urine. Hence, when they are wet they are Tamei, and when they are dry they are Tahor. If she was a Zavah when she gave birth, they are Tamei both wet and dry. Beis Hillel: They are always Tamei, whether they are wet or dry.
3. Rava: The nocturnal emission of a male Nochri is Tahor, even according to Beis Hillel.
4. There is a question about whether such Keri is still Tamei after it has been in the Nochris for three days, as it is no longer Tamei after it has been in a Jewess for three days. The Gemara leaves this question unanswered ("Teiku").
5. This is derived from the verse, "This is the law of the Zav," which implies that the law applies whether or not he is an adult. Just as the first time an adult has a Zav emission it causes Tum'ah, the first time a minor has a Zav emission it causes Tum'ah.
Index to Revach for Maseches Kerisus