夏伤于暑舍营内，秋感寒风并卫居，比时或为外邪束，暑汗无出病疟疾。
【注】经曰∶ 疟皆生于风。谓四时病疟，未有不因风寒外束，暑邪内伏者也。又曰∶疟
者，风寒之气不常也。此言比时病疟者也。又曰∶夏伤于暑，秋为 疟。又曰∶夏暑汗不
出者，秋成风疟。谓夏伤于暑，其邪甚者即病暑，其邪微者则舍于营，复感秋气寒风，与
卫并居，则暑与风寒合邪，始成疟病也。其不即病伤寒者，亦以有暑邪预伏于营中也。盖
有风无暑，惟病风，有暑无风，惟病暑，必风暑合邪，始病疟也。
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，得阴内搏
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，大会于风府，腠理
乃开，开则所客营卫之邪入，邪入得阴内搏则生寒，得阳外出则生热，内外相搏，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。
夏季感受暑邪，潜伏于营分之中；秋季又受寒风侵袭，邪气与卫气相并而居。此时若被外邪束缚，导致暑热之汗无法排出，便会引发疟疾。
【注释】《内经》说：“所有的疟疾都是由风邪引起的。”这是指四季发生的疟疾，没有不是因为风寒束表、暑邪内伏所致。又说：“疟疾，是风寒之气不常（异常）的表现。”这是指当时节令发病的疟疾。又说：“夏季伤于暑邪，到了秋季就会发生疟疾。”又说：“夏季中暑而汗不出的人，秋季会形成风疟。”意思是：夏季伤于暑邪，如果邪气严重就立即发病成为暑病；如果邪气轻微，则潜伏在营分中，再次感受秋季的寒风，与卫气相并居住，这样暑邪与风寒合而为邪，才形成疟病。那些没有立即发病成为伤寒的，也是因为暑邪预先潜伏在营分中的缘故。大概只有风邪没有暑邪，只会生病为风病；只有暑邪没有风邪，只会生病为暑病；必须风邪与暑邪结合，才会得疟疾。
疟疾的邪气随着经络潜伏在脊膂之间，深入脊柱内部注入伏冲脉，横向连接膜原并迫近脏腑。当卫气运行到此处时，正气与邪气正相争斗。邪气得到阴气的内搏则产生寒战，得到阳气的外出则发热蒸蒸。邪气浅薄者，每日发作且与卫气相会；邪气深重者，间日发作是因为卫气运行迟缓而相遇较晚。
【注释】疟气的邪气，潜伏藏匿于营分，随着经络，沿着脊膂的表面下行。这是初病时邪气浅薄，传变停留的次序。邪气深重的，则进入脊膂的内部，潜伏注入冲脉，横向连接各经脂膜的原处以及脏腑。这是邪气逐渐加深，传变停留的次序。卫气，一天一夜循环全身一周。每天早晨天亮时，卫气从足太阳膀胱经的睛明穴发出，在风府穴大会，腠理因此开放，腠理开则客居于营卫之间的邪气进入体内，邪气进入后得到阴气的内搏则生寒，得到阳气的外出则生热，内外相互搏击，邪正交争，疾病于是发作。病初邪气浅薄时，卫气运行未失常度，邪气每天都能与卫气相会，所以每日发作。病久邪气深重时，卫气运行迟缓失常度，邪气不能每天与卫气相会，所以隔日才发作。有时有间隔两天、三天，甚至几天才发作的，也是因为卫气运行越来越迟缓，相会的时间越来越晚，所以发作间隔越来越长。
Summer heat injures the Ying (Nutritive) level and resides within; in autumn, cold wind is contracted and dwells with the Wei (Defensive) level. At that time, if bound by external pathogens, summer sweat cannot exit, resulting in malaria.
[Note] The Classics state: "All malaria arises from wind." This refers to malaria occurring in all four seasons, none of which occur without external binding by wind-cold and internal retention of summer-heat pathogen. It also states: "Malaria is due to the irregularity of wind-cold qi." This speaks of malaria contracted during specific seasonal transitions. It further states: "Summer injury by summer-heat leads to malaria in autumn." And: "Those who suffer summer-heat in summer but do not sweat will develop wind-malaria in autumn." This means: Summer injury by summer-heat—if the pathogen is severe, it causes immediate summer-heat disease; if mild, it resides in the Ying level. Upon re-contracting autumn cold wind, it combines with the Wei level. Thus, summer-heat and wind-cold combine to form malaria. Those who do not immediately contract cold damage do so because summer-heat pathogen was pre-retained in the Ying level. Generally, wind alone causes wind disease; summer-heat alone causes summer-heat disease. Only when wind and summer-heat combine does malaria occur.
The malaria pathogen follows the meridians and lies hidden in the spine and back muscles, penetrating deeply into the interior of the spine and injecting into the Fu Chong vessel. It extends horizontally to connect with the Mo Yuan (Membrane Source) and presses against the Zang-Fu organs. When the Wei Qi arrives at this point, righteous Qi and pathogenic Qi contend. When the pathogen receives Yin Qi's internal containment, chills are generated; when it receives Yang Qi's outward movement, steaming heat occurs. If the pathogen is shallow, it manifests daily as it meets the Wei Qi; if deep, it manifests intermittently because the meeting with the sluggish Wei Qi is delayed.
[Note] The malaria pathogen hides within the Ying level. Following the meridians, it descends along the exterior of the spine and back muscles. This is the initial stage where the pathogen is shallow, marking the sequence of transmission and residence. If the pathogen is deep, it enters the interior of the spine and back muscles, lying hidden and injecting into the Chong Mai (Penetrating Vessel), extending horizontally to connect with the origin of the fat membranes of various meridians and the Zang-Fu organs. This marks the progression where the pathogen becomes deeper, another sequence of transmission and residence. The Wei Qi circulates through the body once every day and night. Each morning at dawn, it emerges from Jingming (BL1) of the Foot-Taiyang Bladder Meridian and gathers at Fengfu (DU16). The Cou Li (pores/skin texture) then open. Once open, the pathogen residing in the Ying and Wei levels enters. Upon entering, if contained internally by Yin, cold is generated; if moving outwardly by Yang, heat is generated. Internal and external contending, pathogen and righteous Qi engaging, the disease manifests. In early stages with shallow pathogen, Wei Qi circulation remains normal, so the pathogen meets the Wei Qi daily, causing daily attacks. In prolonged illness with deep pathogen, Wei Qi circulation becomes sluggish and abnormal, so the pathogen cannot meet the Wei Qi daily, causing intermittent attacks. Sometimes attacks occur after two or three days, or even several days, because the Wei Qi circulation becomes increasingly sluggish, the meeting becomes increasingly delayed, and thus the attack interval lengthens.