病虽瘥，阴阳未和，因早房室，令人阴肿缩入腹，腹 痛，名为交接之劳复也。
谓其人先有宿 ，或患虚劳、风冷、积聚、寒疝等疾，因温热病，发汗、吐、下之
后，热邪虽退，而血气损伤，腑脏皆虚，故因兹而生诸病。
此病皆因岁时不和，温凉失节，人感乖戾之气而生病，则病气转相染易，乃至灭门，延
及外人，故须预服药及为法术以防之。
其病与时气、温、热等病相类，皆由一岁之内，节气不和，寒暑乖候，或有暴风疾雨，
雾露不散，则民多疾疫。病无长少，率皆相似，如有鬼厉之气，故云疫疠病。
《养生方》云∶封君达常乘青牛，鲁女生常乘驳牛，孟子绰常乘驳马，尹公度常乘青骡
。时人莫知其名字为谁，故曰∶欲得不死，当问青牛道士。欲得此色，驳牛为上，青牛次之
，驳马又次之。三色者，顺生之气也。云古之青牛者，乃柏木之精也；驳牛者，古之神宗
之先也；驳马者，乃神龙之祖也。云道士乘此以行于路，百物之恶精，疫气之厉鬼，将长揖
之焉。
《养生方·导引法》云∶延年之道，存念心气赤，肝气青，肺气白，脾气黄，肾气黑，
出周其身，又兼辟邪鬼。欲辟却众邪百鬼，常存心为炎火如斗，煌煌光明，则百邪不敢干之
。可以入温疫之中。
即使病情看似痊愈，但人体阴阳之气尚未调和，此时若过早进行房事，会导致阴部肿胀并收缩入腹，引起腹痛，这种情况被称为“交接劳复”。
所谓“劳复”，是指患者原本就有旧疾，或者患有虚劳、风冷、积聚、寒疝等病症，又感染了温热病。在经历发汗、催吐、泻下等治疗后，虽然热邪已经消退，但气血受到损伤，脏腑功能均处于虚弱状态，因此容易由此引发各种新的疾病。
这类疾病都是因为岁时节令不调，冷暖失当，人体感受了乖戾不正的邪气而发病。这种病气会相互传染，甚至导致全家死亡，蔓延至外人，所以必须预先服药，并采取法术等手段来预防。
这种病的症状与时气病、温病、热病等相似，都是由于一年内节气不和，寒暑失常，或者有暴风骤雨、雾露不散等原因，导致民众多患瘟疫。无论老少，患病者症状大多相似，仿佛有鬼厉之气作祟，所以称为“疫疠病”。
《养生方》记载：封君达常骑青牛，鲁女生常骑杂色牛，孟子绰常骑杂色马，尹公度常骑青骡。当时的人不知道他们的名字是谁，所以说：“想要不死，应当去问青牛道士。”如果想要获得这种颜色的保护，杂色牛最好，青牛次之，杂色马再次之。这三种颜色顺应的是生生之气。传说古代的“青牛”是柏树的精魂；“驳牛”（杂色牛）是上古神宗祖先的化身；“驳马”（杂色马）是神龙的后代。据说道士骑着它们行走于路上，百种邪恶的精怪和瘟疫中凶厉的鬼魂，都会向它们长揖致敬（表示畏惧或顺从）。
《养生方·导引法》说：延年的方法在于存想心气为红色，肝气为青色，肺气为白色，脾气为黄色，肾气为黑色，使这些气环绕周身，同时可以辟除邪鬼。想要驱除各种邪气和百鬼，常常想象心脏像斗大的火焰一样，光芒辉煌明亮，那么各种邪气就不敢侵犯。这样就可以进入瘟疫流行的环境中。
如果热毒炽盛，就会生疮，疮疡遍布全身，形状像火烫伤的疮。如果疮色红而头白，说明毒邪较轻；如果疮色黑紫瘀暗，说明毒邪较重。这种病也叫做“豌豆疮”。
Even if the illness appears to have subsided, the Yin and Yang (Yin-Yang, the opposing forces of nature) are not yet harmonized. If sexual intercourse occurs too early, it causes swelling of the genitals and retraction into the abdomen, accompanied by abdominal pain. This condition is named "Jiaojie Laofu" (Relapse due to Sexual Intercourse).
The term "Laofu" refers to a situation where the patient previously had lingering diseases or suffered from deficiency-fatigue (Xu Lao), wind-cold (Feng Leng), accumulation-masses (Ji Ju), or cold-colic (Han Shan). After contracting a warm-heat disease (Wen Bing) and undergoing treatments such as sweating (Fa Han), vomiting (Tu), or purging (Xia), although the pathogenic heat has receded, the Qi and Blood (Qi-Xue, vital energy and blood) are damaged, and the Zang-Fu organs (Zang-Fu, internal organs) are all deficient. Consequently, various illnesses arise from this state.
These diseases occur because the seasonal rhythms are disordered, and warmth and coolness are unregulated. People contract abnormal and hostile pathogens (Guai Li Zhi Qi), causing the pathogenic factors to transmit and infect one another, potentially wiping out entire households and spreading to outsiders. Therefore, it is necessary to take medicine in advance and employ magical methods for prevention.
The symptoms of this illness are similar to those of seasonal qi diseases, warm diseases, and heat diseases. All result from disordered solar terms within a year, irregular cold and heat patterns, violent storms, heavy rain, or persistent fog and dew, leading to widespread epidemics among the people. Regardless of age, patients exhibit similar symptoms, resembling the influence of ghostly malevolent energies; hence, it is called "Yili Disease" (Epidemic Pestilence).
The *Yangsheng Fang* (Prescriptions for Nourishing Life) states: Feng Junda often rode a green ox, Lu Nvsheng often rode a piebald ox, Meng Zichuo often rode a piebald horse, and Yin Gongdu often rode a green mule. At that time, people did not know their real names, so they said, "If you wish not to die, ask the Green Ox Daoist." To obtain protection associated with these colors, the piebald ox is superior, the green ox is next, and the piebald horse is third. These three colors correspond to the generative Qi (Sheng Qi). It is said that the ancient "Green Ox" was the spirit essence of cypress wood; the "Piebald Ox" was an ancestor of the ancient Divine Ancestor; the "Piebald Horse" was the progenitor of divine dragons. It is claimed that Daoists riding these animals on roads would cause all evil spirits and malignant ghosts of epidemics to bow deeply in reverence/fear.
The *Yangsheng Fang · Daoyin Fa* (Guiding and Pulling Method) states: The way to prolong life lies in visualizing the Heart Qi as red, Liver Qi as green, Lung Qi as white, Spleen Qi as yellow, and Kidney Qi as black, allowing them to circulate around the body, thereby also repelling evil ghosts. To drive away various evils and hundred ghosts, one should constantly visualize the heart as a flame like a measuring dipper, shining brightly, so that no evil dare interfere. One can then enter areas affected by epidemic fevers.
When heat-toxin (Re Du) is excessive, sores erupt, covering the whole body, resembling burns. If the sores are red with white heads, the toxin is mild; if they are dark purple and bruised, the toxin is severe. This condition is also known as "Pea Sores" (Wandou Chuang).