（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。）
*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.)