2.疟随经络循伏膂, 深入脊内注伏冲, 横连膜原薄脏腑, 会卫之时
正邪争, 得阴内薄生寒栗, 得阳外出热蒸蒸, 邪浅日作日会卫, 邪深
间作卫迟逢.
【注】疟气之邪, 伏藏于营, 随其经络, 循脊膂之表而下. 此初病邪
浅,传舍之次也. 其邪深者, 则入脊膂之内, 伏注于冲脉, 横连诸经
脂膜之原内及脏腑. 此邪渐深, 传舍之次也. 卫气者, 一日, 一夜周
于身, 每至明旦, 则出足太阳睛明, 大会于风腑, 腠理乃开, 开则所
客营卫之邪入, 邪入得阴内薄则生寒, 得阳外出则生热 , 内外相薄,
邪正交争, 而病乃作也. 病初邪浅者, 卫行未失常度, 其邪日与卫会
,故日作也. 病久邪深者, 卫行迟失常度, 其邪不能日与卫会, 故间
日乃作也. 时有间二日, 间三日, 或至数日作者, 亦卫气行愈迟, 会
愈迟, 故作愈迟也.
3.卫不循经行脉外, 阳会昼发阴夜发, 邪退自然归阳分, 病进每必
入阴家.
【注】营气循经而行脉中. 卫气不循经而行脉外, 惟日行于三阳, 夜
行于三阴. 故邪在三阳之浅者, 则昼发. 邪在三阴之深者, 则夜发.
病邪将退者, 夜发退为昼发, 此为去阴就阳, 则病欲已也. 病邪渐进
者,昼发进为夜发, 此为去阳入阴, 则病益甚也.
2. 疟邪随着经络潜伏于脊膂，深入脊柱内部注入伏冲脉，横向连接膜原并迫近脏腑。当卫气运行至此处时，正气与邪气相互争斗。邪气内迫阴分则产生寒战，外出阳分则发热蒸腾。邪气浅表者每日发作一次，因为每日与卫气相会；邪气深重者间歇发作，是因为卫气运行迟缓而相遇较晚。
【注】疟疾的邪气，潜伏藏匿于营分，随着其所在的经络，沿着脊背和膂肉的表层向下传变。这是初病时邪气浅表，处于传变的初级阶段。那些邪气深重的，则进入脊背和膂肉的内侧，潜伏注入冲脉，横向连接各经脂膜的源头内部以及脏腑。这是邪气逐渐加深，处于传变的进阶阶段。卫气，一昼夜在全身循环一周，每天清晨，从足太阳膀胱经的睛明穴出发，大会于风府穴，腠理因此开放，腠理开放后，客居于营卫之中的邪气便随之出入。邪气内迫阴分则生寒，外出阳分则生热，内外邪正相互搏击，正邪交争，疾病于是发作。疾病初期邪气浅表者，卫气运行未失常度，邪气每日都能与卫气相会，所以每日发作。患病日久邪气深重者，卫气运行迟缓且失常度，邪气不能每日都与卫气相会，所以隔日才发作。有时有间隔两天、三天，甚至数日才发作的，也是因为卫气运行更加迟缓，相会的时间更加推迟，所以发作间隔更长。
3. 卫气不遵循常规经脉行于脉外，阳气相会在白天发病，阴气相会在夜间发病。邪气衰退自然回归阳分，病情进展每每必然陷入阴分。
【注】营气沿着经脉在脉中运行。卫气不遵循常规经脉而在脉外运行，只在白天行于三阳经，夜晚行于三阴经。所以邪气在三阳经浅表部位的，就在白天发作。邪气在三阴经深部的，就在夜间发作。病邪将要消退时，由夜间发作转为白天发作，这是由阴出阳，说明疾病将要痊愈。病邪逐渐进展时，由白天发作转为夜间发作，这是由阳入阴，说明疾病日益加重。
2. Malaria pathogens follow the meridians and lie hidden in the spine and back muscles, penetrating deeply into the interior of the spine to enter the Fuchong (Hidden Rushing) vessel, extending laterally to connect with the Membrane Source (Moyuan) and pressing against the Zang-Fu organs. When Wei Qi (Defensive Qi) arrives at this location, Zheng Qi (Upright Qi) and Xie Qi (Pathogenic Qi) contend. When pathogenic Qi presses inward toward Yin, chills are generated; when it moves outward toward Yang, steaming heat is produced. When pathogens are shallow, attacks occur daily as they meet with Wei Qi each day; when pathogens are deep, attacks occur intermittently because the meeting with Wei Qi is delayed due to its slower circulation.
[Note] The pathogenic Qi of malaria lies hidden within Ying Qi (Nutritive Qi). Following its respective meridians, it travels downward along the exterior of the spine and back muscles. This represents the initial stage where pathogens are shallow, corresponding to the early phase of transmission progression. In cases where pathogens are deep, they enter the interior of the spine and back muscles, lying hidden and injecting into the Chong Mai (Penetrating Vessel), extending laterally to connect with the origin of the fat membranes of various meridians and reaching the interior of the Zang-Fu organs. This represents a deeper level of pathology, corresponding to an advanced phase of transmission progression. Wei Qi circulates through the entire body once every twenty-four hours. Each morning, it emerges from Jingming (BL1) of the Foot-Taiyang Bladder Meridian and converges at Fengfu (DU16), causing the Cou Li (pores/skin texture) to open. Upon opening, the pathogens residing in Ying and Wei Qi can move in and out. When pathogens press inward toward Yin, cold is generated; when they move outward toward Yang, heat is generated. The internal and external forces clash, and the struggle between Zheng Qi and Xie Qi causes the disease to manifest. In the early stages when pathogens are shallow, the circulation of Wei Qi remains normal, so the pathogens meet with Wei Qi daily, resulting in daily attacks. In chronic cases where pathogens are deep, the circulation of Wei Qi becomes sluggish and irregular, so the pathogens cannot meet with Wei Qi daily, resulting in intermittent attacks. Occasionally, attacks may occur after two days, three days, or even several days; this is because the circulation of Wei Qi is increasingly sluggish, delaying the meeting time further, thus prolonging the interval between attacks.
3. Wei Qi does not follow the standard meridians but moves outside the vessels; Yang convergence leads to daytime onset, while Yin convergence leads to nighttime onset. As pathogens recede, they naturally return to the Yang aspect; as the disease progresses, it inevitably enters the Yin domain.
[Note] Ying Qi circulates within the vessels following the meridians. Wei Qi does not strictly follow the meridians but moves outside the vessels, traveling through the Three Yang meridians during the day and the Three Yin meridians at night. Therefore, pathogens located superficially in the Three Yang meridians manifest during the day. Pathogens located deeply in the Three Yin meridians manifest at night. When pathogens are receding, a shift from nighttime attacks to daytime attacks indicates a movement from Yin to Yang, suggesting that the disease is about to resolve. When pathogens are progressing, a shift from daytime attacks to nighttime attacks indicates a movement from Yang to Yin, suggesting that the disease is worsening.