（素问遗篇刺法论）
黄帝曰∶余闻五疫之至，皆相染易，无问大小，病状相似，不施救疗，如何可得不相移易者？（五疫，即五运疫疠
之气，详见运气类四十一，与此原出同篇，所当互考。如何可得不相移易者，谓欲禁止其传染也。）岐伯曰∶不相染者，
正气存内，邪不可干，避其毒瓦斯，天牝从来，复得其往，气出于脑，即不邪干。（疫疠乃天之邪气，若吾身正气内固，则
邪不可干，故不相染也。天牝，鼻也，鼻受天之气，故曰天牝，老子谓之玄牝，是亦此义。气自空虚而来，亦欲其自空
虚而去，故曰避其毒瓦斯，天牝从来，复得其往也。盖以气通于鼻，鼻连于脑中，流布诸经，令人相染矣。气出于脑，谓
嚏或张鼻泄之，则邪从鼻出，毒瓦斯可令散也。）气出于脑，即先想心如日。（日为太阳之气，应人之心，想心如日，即所
以存吾之气，壮吾之神，使邪气不能犯也。）欲将入于疫室，先想青气自肝而出，左行于东，化作林木；（心之所至，气
必至焉，故存想之，则神有所注而气可王矣。左行于东，化作林木之状，所以壮肝气也。）次想白气自肺而出，右行于西，
化作戈甲；（所以壮肺气也。）次想赤气自心而出，南行于上，化作焰明；（所以壮心气也。）次想黑气自肾而出，北行而
下，化作水；（所以壮肾气也。）次想黄气自脾而出，存于中央，化作土。（所以壮脾气也。）五气护身之毕，以想头上如
北斗之煌煌，然后可入于疫室。（煌煌，辉耀貌。天行疫疠传染最速，故当谨避之如此。）
又一法，于春分之日，日未出而吐之。（旧注曰∶用远志去心，以水煎之，饮二盏，吐之，不疫。）
又一法，于雨水日后，三浴以药泄汗。（谓以祛邪散毒之药，煎汤三浴，以泄其汗也。）
又一法，小金丹方∶辰砂二两，水磨雄黄一两，叶子雌黄一两，紫金半两，（以金箔同研之，可为细末。）同入合中，
外固了，地一尺筑地实，不用炉，不须药制，用火二十斤 之也，七日终，（常令火不断。）候冷七日取，次日出合子，
埋药地中七日，取出顺日研之三日，炼白沙蜜为丸如梧桐子大，每日望东吸日华气一口，冰水下一丸，和气咽之，服十
粒，无疫干也。（合子，即瓷罐之属。顺日研之，谓左旋也。按∶此遗篇之言，乃出后人增附，法非由古，未足深信，愚
有避疫法在阴阳类首章，所当并察。）
《黄帝内经·素问》遗篇《刺法论》记载：
黄帝问道：我听说五疫之气来临时，都会相互传染，无论年龄大小，患病症状都相似。如果不进行救治治疗，怎样才能做到不互相传染呢？（五疫，即五行运化所产生的疫疠之气，详见“运气类”第四十一节，与此处原文出自同一篇章，应当互相参考考证。“如何可得不相移易者”，意思是想要禁止其传染。）
岐伯回答说：之所以不互相传染，是因为人体正气充盛于内，邪气就无法侵犯；同时避开毒气，它从鼻子进入，也要让它从鼻子排出，气息出于脑部，就不会被邪气侵犯。（疫疠属于天之邪气，如果自身正气内部坚固，那么邪气就无法侵犯，所以不互相传染。天牝，指鼻子，鼻子接受天的清气，所以叫天牝，老子称之为玄牝，也是这个意思。气从空虚的地方来，也希望能从空虚的地方去，所以说避开毒气，它从鼻子进来，再让它从鼻子出去。大概因为气通于鼻，鼻连着脑，流布到各条经脉，使人相互传染。所谓“气出于脑”，是指打喷嚏或者张开鼻孔泄出邪气，那么邪气就从鼻子出来，毒气就可以消散了。）
当气出于脑时，首先要想象心脏像太阳一样光明。（太阳代表阳气，对应人的心脏，想象心脏像太阳，就是用来保存我的正气，壮大我的精神，使邪气不能侵犯。）
打算进入瘟疫房间之前，先想象青色之气从肝脏发出，向左运行到东方，化作树木森林的样子；（心念所至，气必随之，所以通过存想，精神有所专注，气就能旺盛。向左运行到东方，化作林木的样子，是用来壮大气肝气的。）接着想象白色之气从肺脏发出，向右运行到西方，化作兵器铠甲的样子；（这是用来壮大气肺气的。）接着想象红色之气从心脏发出，向南运行到上方，化作火焰明亮的样子；（这是用来壮大气心气的。）接着想象黑色之气从肾脏发出，向北运行到下方，化作水的样子；（这是用来壮大气肾气的。）接着想象黄色之气从脾脏发出，存留于中央，化作土地的样子。（这是用来壮大气脾气的。）五种颜色的气保护身体完毕之后，再想象头顶上有北斗星那样光辉灿烂，然后才可以进入瘟疫房间。（煌煌，形容光辉闪耀的样子。天行疫病传染速度最快，所以要如此谨慎地避免它。）
另一种方法，在春分这一天，太阳还没出来的时候进行吐法。（旧注解说：用远志去掉心部，用水煎煮，喝两盏，然后催吐，就不会染上疫病。）
又一种方法，在雨水节气之后，用药物洗澡三次以发汗。（意思是用祛除邪气、散发毒气的药物，煎汤洗三次澡，以此来发泄汗液。）
又一种方法，小金丹方：辰砂二两，水磨雄黄一两，叶子雌黄一两，紫金半两，（将金箔一同研磨，可以成为细末。）一起放入合子中，外面密封牢固，在地上挖一尺深坑夯实，不用炉灶，不需要经过其他药物炮制，用火二十斤煅烧它，七天结束，（要常常让火不断。）等冷却七天后取出，第二天拿出合子，把药埋在地里七天，取出来后顺着方向研磨三天，炼白沙蜜做成梧桐子大小的丸药，每天面向东方吸一口日华之气，用冰水送下一丸，调和气息吞下，服用十粒，就没有疫病能干扰了。（合子，就是瓷罐之类的容器。顺日研磨，意思是向左旋转。按：这段遗篇的话，是后人增补附上的，方法并非源自古代，不足以深信，我有避疫的方法在“阴阳类”首章，应当一并考察。）
*Suwen Yipian: Cifa Lun* (Lost Chapter of *Suwen*: Treatise on Needling Methods):
Huangdi asked, "I have heard that when the five plagues (*Wuyi*) arrive, they are all contagious. Regardless of age, the symptoms are similar. If no treatment is provided, how can one prevent transmission?" (*Wuyi* refers to the epidemic qi generated by the Five Movements and Six Qi; see detailed discussion in Section 41 of the 'Yunqi Category'. This text originates from the same chapter as the original source and should be cross-referenced. 'How to prevent transmission' means desiring to stop its contagion.)
Qibo replied, "Those who do not get infected possess righteous qi (*Zhengqi*) within, so evil qi (*Xieqi*) cannot invade. Avoid the toxic vapors; since they enter through the Heavenly Nostril (*Tianbing*, i.e., the nose), let them exit through the same path. When the qi emerges from the brain, it will not be invaded by evil." (Epidemic pathogens are heavenly evil qi. If one's internal righteous qi is solid, evil qi cannot invade, hence no infection. *Tianbing* refers to the nose, which receives heavenly qi, thus called Heavenly Nostril; Laozi referred to it as the Mysterious Female (*Xuanni*), sharing this meaning. Qi comes from emptiness and should return to emptiness; thus, avoid toxic vapors entering via the nose and let them exit. Since qi connects to the nose, and the nose connects to the brain, spreading through meridians causes contagion. 'Qi emerging from the brain' refers to sneezing or opening the nostrils to expel evil, allowing toxic vapors to dissipate.)
When qi emerges from the brain, first visualize the heart like the sun. (The sun represents solar yang qi, corresponding to the human heart. Visualizing the heart like the sun preserves one's righteous qi and strengthens spirit, preventing evil invasion.)
Before entering a plague room, first visualize green qi emanating from the liver, moving left to the East, transforming into forests and trees; (Wherever the mind goes, qi follows. Visualization focuses the spirit and strengthens qi. Moving left to the East and transforming into trees strengthens Liver qi.) Next, visualize white qi emanating from the lungs, moving right to the West, transforming into weapons and armor; (This strengthens Lung qi.) Next, visualize red qi emanating from the heart, moving south and upward, transforming into bright flames; (This strengthens Heart qi.) Next, visualize black qi emanating from the kidneys, moving north and downward, transforming into water; (This strengthens Kidney qi.) Next, visualize yellow qi emanating from the spleen, residing in the Center, transforming into earth. (This strengthens Spleen qi.) After visualizing the five colored qi protecting the body, visualize the head shining brightly like the Big Dipper (*Beidou*), then one may enter the plague room. ('Huanghuang' describes a radiant appearance. Epidemics spread rapidly, so such caution is necessary.)
Another method: On the day of the Spring Equinox (*Chunfen*), perform expectoration before sunrise. (Old annotations state: Decoct *Polygalae Radix* (*Yuanzhi*) with the heart removed, drink two cups, and induce vomiting; this prevents infection.)
Another method: After the Rain Water (*Yushui*) solar term, bathe three times with medicinal herbs to induce sweating. (This involves bathing three times in decoctions of herbs that dispel evil and scatter toxins to release sweat.)
Another method: The Little Golden Pill Formula (*Xiao Jindan Fang*). Take two taels of Cinnabar (*Chensha*), one tael of Arsenic Trioxide powder prepared by water-grinding (*Xionghuang*), one tael of Realgar leaf powder (*Cihuang*), and half a tael of Purple Gold (*Zijin*, gold foil). (Grind together until fine.) Place them in a porcelain jar (*Hezi*), seal it tightly externally, dig a pit one chi deep, compact the earth firmly. Do not use a furnace; no other processing is needed. Fire with twenty jin of fuel for calcination (*Jiu*). Complete in seven days (keep the fire burning continuously). Wait seven days after cooling to retrieve. On the next day, remove the contents, bury the medicine in the ground for seven days, retrieve it, grind it counter-clockwise (*Shunri*) for three days, refine white sand honey to form pills the size of *Clerodendrum* seeds (*Wutongzi*). Every day, face east and inhale one breath of solar qi, swallow one pill with ice water, harmonizing the qi while swallowing. Taking ten pills ensures no epidemic interference. (*Hezi* refers to ceramic jars. Grinding counter-clockwise means rotating to the left. Note: These words from the lost chapter were added by later authors; the methods are not ancient and should not be trusted blindly. My own plague prevention methods are in the first chapter of the 'Yin-Yang Category'; consult both.)