此水中射工，又有树上毛虫，亦名射工者，见后毛虫伤方。射工，一名溪鬼虫，又名射
影，又名水弩，出南方有溪毒处。长二三寸，宽寸许，形扁，前宽后窄，腹软背硬，如蝉，
又如鳖；六七月甲下有翅能飞，作铋铋声；宽头尖嘴，嘴头有角如爪，长一二分；有六足，
如蟹足，两足在咀下，大而一爪，四足在腹下，小而双爪；口有弩形，以气射人影，去人三
、四步即中，令人发疮，不治即死。病有四种∶初得皆如伤寒，或似中恶。一种遍身有
子，四边微红，犯之如刺；一种作疮，久则穿陷；一种突起如石；一种如火烧状。
又有溪毒中人，一名中水，一名中溪，一名水病。似射工而不见形，春月多有此病症。
头痛恶寒，状如伤寒，二三日则腹中生虫，食人下部，渐食五脏，注下不禁，虽良医难治。
初得则下部有疮红赤，形如截肉为阳毒，最急。若疮如虫啮为阴毒，其势稍缓，皆能杀人，
过二十日，不治。方家用药，与伤寒、瘟病相似，须用苍耳草绞汁服一二升，并用棉蘸汁浓
敷下部，或以小蒜煮微热汤（不可大热，大热则无力）洗之，若身发赤斑，其毒已出也。
又方∶取豉母虫一枚，含入口中立愈，虽死亦活；或用盐梅裹含之亦可；此葛仙《肘后
方》也。豉母虫，一名豉虫，光黑，大如豆，浮游水上者即是。
又方∶猪血饮之即解。
又方∶知母连根叶研末服，或投水绞汁饮一二升，煮汤洗浴亦佳。夏月出行多带知母，
连根捣碎，投水上流，可避此毒。
又方∶鸡粪（要白色者）与糯米糖调敷，效。
又方∶苍耳草嫩苗（生草药店有买）取汁和酒温灌之，其渣浓敷伤处，甚效。
又方∶芥菜子末，和酒浓敷，半日止痛。
又方∶马齿苋，捣汁一升服，以渣敷之，日四、五次。
又方∶皂角，长尺余者，好醋煮浓汁如膏敷之。
又方∶白鹅血饮之，并敷其身，极效。
又方∶夜睡时，以手摩身体有辣痛，熟视当有赤点如针头，急捻之，以芋头叶入内刮出
细沙，以蒜敷之，即愈。又痛处有刺如虾须。用芋头及甘蔗叶屈角入内，勾出其根则愈。迟
则其根入骨难治。
这种水中的射工虫，以及树上的毛虫（也名为射工），详见后文“毛虫伤”方。射工，又名溪鬼虫，又被称为射影、水弩，出现在南方有溪毒的地方。它身长二三寸，宽约一寸，身体扁平，前宽后窄，腹部柔软背部坚硬，形状像蝉，又像鳖；六七月间，它的腹部下有翅膀能够飞行，发出铋铋的声音；头部宽大，嘴尖，嘴头有角状物如爪，长一二分；有六只脚，像蟹脚，两只脚在嘴下，大且一只爪，四只脚在腹下，小且双爪；口部有弩的形状，能以气息射击人的影子，距离人三四步就能命中，使人发生疮疡，不治疗就会死亡。病症有四种：刚得病时都像伤寒，或者像中恶。一种遍身出现子粒，四周微红，触碰时像针刺；一种形成疮疡，久了则穿孔凹陷；一种突起像石头；一种像火烧的样子。
又有溪毒中人，一名中水，一名中溪，一名水病。症状类似射工但看不见虫形，春季月份多有此病症。头痛恶寒，样子像伤寒，二三天后腹中生虫，吃人下部，逐渐侵蚀五脏，导致腹泻不止，即使是良医也难治疗。刚得病时下体有疮，红赤，形状像截断的肉，属于阳毒，最为急重。如果疮像被虫咬一样，属于阴毒，病情稍缓，但都能致死，超过二十天不治疗就无法治愈。医生用药，与伤寒、瘟病相似，必须用苍耳草绞汁服用一二升，并用棉花蘸取药汁浓敷在下部，或者用小蒜煮成微热的汤（不可太热，太热则药效无力）清洗患处。如果身上发出赤斑，说明毒素已经排出。
另一个方子：取豉母虫一枚，含入口中立刻痊愈，即使死了也能救活；或者用盐梅包裹含着也可以；这是葛仙《肘后方》里的记载。豉母虫，又名豉虫，光亮黑色，大如豆子，浮游在水面上的就是。
又一个方子：将知母连同根叶研成末服用，或者取水绞汁饮用一二升，煮汤洗浴也很好。夏季出行多带知母，连根捣碎，投入上游水中，可以避开这种毒。
又一个方子：取苍耳草嫩苗（生草药店有卖）的汁液和酒温服，剩下的药渣浓敷在受伤处，非常有效。
又一个方子：马齿苋，捣汁一升服用，用渣滓外敷，每天四、五次。
又一个方子：饮用白鹅血，并涂抹在身上，极有效。
又一个方子：夜间睡觉时，用手按摩身体上有辣痛感的地方，仔细查看会有像针头一样的赤点，急忙捏住，用芋头叶伸入内部刮出细沙，再用大蒜外敷，即愈。另外痛处有刺像虾须。用芋头及甘蔗叶弯曲角伸入内部，勾出其根部则痊愈。拖延则其根入骨难治。
This "Shegong" (Arrow Worker Insect) in the water, along with the hairy caterpillars on trees (also named Shegong), are detailed later in the section on "Hairy Caterpillar Injury". Shegong is also known as Xigui Chong (Stream Ghost Insect), or Shaying (Shadow Shooter), or Shuinu (Water Crossbow). It appears in southern regions where stream toxins exist. It is two to three cun long and about one cun wide, flat in shape, wider at the front and narrower at the back, soft on the belly and hard on the back, resembling a cicada or a turtle; from the sixth to seventh lunar months, it has wings under its abdomen that allow it to fly, making a "bi-bi" sound; it has a broad head and pointed mouth, with horn-like claws at the tip of the mouth, one to two fen long; it has six legs like crab legs, two located under the mouth, large with a single claw, and four located under the abdomen, small with double claws; its mouth resembles a crossbow, capable of shooting its breath at a person's shadow, hitting them from three or four paces away, causing sores. If untreated, it leads to death. There are four types of illness: initially, all resemble Taiyang disease (Exterior Syndrome of the Bladder Channel) or sudden severe poisoning. One type presents with widespread nodules on the body, slightly red around the edges, feeling like needle pricks upon contact; another type forms sores that eventually perforate and sink; another type protrudes like stone; and another type looks like a burn.
There is also "stream toxin entering the human body", known as Zhongshui (Water Poisoning), Zhongxi (Stream Poisoning), or Shuibing (Water Disease). It resembles Shegong but the insect is invisible, occurring frequently in spring. Symptoms include headache and aversion to cold, resembling Taiyang disease. After two to three days, worms may develop in the abdomen, eating the lower parts of the body, gradually invading the five zang organs, leading to uncontrollable diarrhea, which is difficult even for skilled physicians to treat. Initially, there are red, raw sores in the lower region, resembling cut flesh, classified as Yang Du (Yang Toxin), which is most acute. If the sores resemble insect bites, it is classified as Yin Du (Yin Toxin), with a slightly slower progression, yet both can be fatal if untreated beyond twenty days. The herbal remedies used by physicians are similar to those for Taiyang disease and epidemic febrile diseases. One must administer one to two sheng of juice extracted from Xanthium herb (Cang'er Cao) orally, and apply thick cotton soaked in the juice densely to the lower region. Alternatively, wash the area with a decoction of Allium macrostemon (Xiao Suan) prepared at a warm temperature (not too hot, as excessive heat reduces efficacy). If red spots appear on the body, it indicates the toxin has been expelled.
Another prescription: Take one Daimu Chong (Fermented Bean Insect), place it in the mouth, and cure immediately; even if dead, life can be restored. Alternatively, wrap it in salted plum and hold it in the mouth. This is recorded in Ge Xian's *Zhouhou Fang* (Emergency Prescriptions for Handbooks). Daimu Chong, also known as Chi Chong, is shiny black, bean-sized, and found floating on the water surface.
Another prescription: Drink pig blood to detoxify.
Another prescription: Grind Rhizoma Anemarrhenae (Zhimu) including roots and leaves into powder and ingest, or drink one to two sheng of juice extracted from water. Bathing in the decoction is also beneficial. During summer travel, carry more Rhizoma Anemarrhenae, crush it with roots, and throw it into the upstream water to avoid this toxin.
Another prescription: Mix chicken manure (preferably white) with glutinous rice sugar and apply topically. Effective.
Another prescription: Extract juice from young shoots of Xanthium herb (available fresh in herbal shops), mix with wine, and take warm. Apply the residue densely to the injured area. Very effective.
Another prescription: Mix mustard seed powder with wine and apply densely. Relieves pain within half a day.
Another prescription: Crush Portulaca oleracea (Machi Xian) to extract one sheng of juice for oral administration, and apply the residue topically, four to five times daily.
Another prescription: Use Gleditsia sinensis (Zao Jiao) over one chi long, boil with good vinegar until a thick paste forms, and apply topically.
Another prescription: Drink white goose blood and apply it to the body. Extremely effective.
Another prescription: When sleeping at night, massage areas of the body that feel burning and painful. Upon close inspection, you may find red dots like needle heads. Pinch them urgently, insert a leaf of Colocasia esculenta (Yutou Ye) inside to scrape out fine sand, then apply garlic topically for immediate healing. Additionally, spines like shrimp whiskers may appear at the painful site. Insert the bent corner of a Colocasia esculenta leaf or sugarcane leaf into the wound to hook out the root. Healing occurs once the root is removed. Delay allows the root to penetrate the bone, making treatment difficult.