《千金》论曰∶凡山水有毒虫，人涉水中，觉似射工而无物。其诊法∶初得之恶寒，微以头痛目痛，心中
烦懊，四肢振 ，腰背百节皆强，两膝痛，或翕翕面热但欲睡，旦醒暮剧，手足逆冷至肘膝，二、三日腹中
生虫，食人下部，肛中有疮，不痛不痒，令人不觉。不急治，过六、七日下部出脓溃，虫上食人五脏，热盛毒
烦，下利不禁，八、九日良医不能治矣。觉得之，急早视其下部，若有疮正赤如截肉者阳毒。最急。若疮如
鲤鱼齿者为阴毒，犹小缓要，皆杀人，不过二十日也。欲知是中水与非者，当作五、六升汤，以小蒜五升，
咀投汤中消息，勿令大热，去滓，以浴之。是水毒，身体当发赤斑。无异者非也，当以他病治也。
《千金》治中水毒方。
上取梅若桃叶捣，绞取汁三升许，或干以少水绞取汁饮之。小儿不能饮，以汁敷乳头与吃。
《千金翼》治水毒方。
上捣苍耳取汁，服一升，以绵沾汁滓导下部中，日三。
《千金翼》又方
上取蓼一把捣，取汁服一升，不过三服。
《千金翼》又方
上取蓝一把捣，水解以洗面目身令遍。
《千金翼》又方
上取大莓根末饮之，并导下部，生虫者用汁。夏月常多将此药屑入水浴，以方寸匕投水上流，无所畏，又
辟射工。凡洗浴以少许投水盆中。（即无复毒也。）
《千金方》论述道：凡是山间溪流的水中有毒虫，人涉水过河时，感觉好像有“射工”（一种能含沙射人的毒虫）攻击却看不见实物。其诊断方法为：刚患病时怕冷，轻微头痛和眼痛，心中烦闷懊恼，四肢颤抖，腰背及全身关节都僵硬强直，两膝疼痛，或者面部烘热但只想睡觉，早晨清醒傍晚加重，手足冰冷延伸至肘部和膝盖。二、三天后腹中生出虫子，啃食人体下部，肛门周围生疮，不痛不痒，让人毫无察觉。如果不紧急治疗，过了六、七天，下部会流脓溃烂，虫子向上侵蚀五脏，出现热盛毒重、烦躁不安、腹泻无法控制的症状，到了八、九天，即使是良医也无法治愈了。发现患病后，应尽早检查患者下部，如果疮口正红如同被刀切开的肉一样，属于阳毒，最为危急。如果疮口形状像鲤鱼牙齿，属于阴毒，病情稍缓但仍需重视，这两种情况都不过二十天就会致死。想要知道这是否是中水毒，可以烧煮五到六升热水，放入切碎的五升小蒜，在汤中浸泡斟酌，不要让水太烫，滤去药渣，用此水洗浴。如果是水毒，身体应当发出红色斑点。如果没有这种反应，则不是水毒，应当按照其他疾病进行治疗。
《千金方》治疗中水毒的方剂。
以上述药材，取梅叶或桃叶捣碎，绞取汁液约三升，如果是干叶，则加少量水绞取汁液饮用。小儿如果不能饮用，将汁液涂抹在乳头上让婴儿吸吮。
《千金翼方》治疗水毒的方剂。
以上述药材，捣碎苍耳取汁，服用一升，用棉絮蘸取药渣汁液塞入下部（肛门），每天三次。
《千金翼方》又一方。
以上述药材，取一把蓼草捣碎，取汁液服用一升，不超过三次即可。
《千金翼方》又一方。
以上述药材，取一把蓝草捣碎，用水溶解后清洗面部、眼睛和全身，使其遍敷。
《千金翼方》又一方。
以上述药材，取大莓根粉末冲服，并用于下部给药，若体内生虫则使用汁液。夏季经常将这些药屑带入水中沐浴，用方寸匕（量器）的量投入水流上游，无所畏惧，又能预防射工毒虫。凡是洗浴时，将少许药屑投入水盆中。（这样就没有毒性了。）
Qianjin Fang (Essential Prescriptions Worth a Thousand Gold) states: In mountain streams, there are toxic insects. When people wade through the water, they feel as if attacked by "Shegong" (a toxic insect capable of shooting sand to cause disease) but see no physical object. The diagnostic method is as follows: Upon initial onset, there is aversion to cold, mild headache and eye pain, mental restlessness and vexation, trembling of the four limbs, stiffness and rigidity of the waist, back, and all joints, pain in both knees, or alternatively, a flushing sensation on the face with drowsiness. The condition is better in the morning and worse at night. Coldness extends from the hands and feet up to the elbows and knees. After two or three days, worms generate in the abdomen, eating into the lower part of the body. Sores appear around the anus, which are neither painful nor itchy, causing the patient to be unaware of them. If not treated urgently, after six or seven days, pus will discharge and ulcerate from the lower part; the worms will ascend to eat the five Zang organs (Heart, Liver, Spleen, Lung, Kidney). There will be intense heat, severe toxicity, restlessness, and uncontrollable diarrhea. By the eighth or ninth day, even a skilled physician cannot cure it. Upon suspicion, examine the lower part immediately. If the sore is bright red like cut meat, it is Yang Du (Yang Toxicity), which is most urgent. If the sore resembles carp teeth, it is Yin Du (Yin Toxicity); although slightly less urgent, it still requires attention. Both can be fatal within twenty days. To determine if this is Shui Du (Water Toxicity), boil five or six sheng (a unit of volume) of water. Add five sheng of chopped small garlic (Allium tuberosum var. angulosum), steep it in the water, do not let it become too hot, strain the residue, and use the liquid for bathing. If it is Water Toxicity, red spots should appear on the body. If there is no such reaction, it is not Water Toxicity, and other diseases should be treated accordingly.
Qianjin Fang formula for treating Shui Du (Water Toxicity).
Take leaves of plum or peach, crush them, and squeeze out approximately three sheng of juice. If using dried leaves, add a small amount of water to squeeze out the juice and drink it. For children who cannot drink, apply the juice to the nipple for the infant to suck.
Qianjin Yi Fang (Supplement to Essential Prescriptions Worth a Thousand Gold) formula for treating Water Toxicity.
Crush Xuan Shen Cao (Cocklebur fruit, *Xanthium sibiricum*) to extract juice. Take one sheng orally. Dip cotton in the residue juice and insert it into the lower orifice (anus) three times a day.
Qianjin Yi Fang, another formula.
Take a handful of Jiao Gu (Smartweed/Polygonum species), crush it, extract the juice, and take one sheng. Do not exceed three doses.
Qianjin Yi Fang, another formula.
Take a handful of Lan Cao (Indigo plant, *Isatis tinctoria*), crush it, dissolve in water, and wash the face, eyes, and entire body thoroughly.
Qianjin Yi Fang, another formula.
Take powder from the root of Da Mei Gen (likely *Rubus* species or similar medicinal root) and ingest it. Also apply to the lower orifice; if worms are present, use the juice. During summer, frequently add these herbal powders to bathwater. Throw a "Fang Cun Bi" (a square-inch measure, approx. 5-10 grams) upstream while bathing, without fear, as it also repels Shegong (toxic insects). For any bathing, throw a small amount of the herb into the basin. (This eliminates the toxicity.)