Acari are mainly distributed in some places in Sichuan.

Ticks have no pain when biting and sucking blood. However, due to the simultaneous penetration of claws and oral plates into the host skin, it can cause local congestion, edema, acute inflammatory reaction and secondary infection. The neurotoxin secreted by saliva of some Ixodes in the process of biting and sucking blood can cause motor fiber conduction disorder of the host, cause ascending muscle paralysis, and lead to respiratory failure and death, which is called tick paralysis. More common in children. If it can be found in time, ticks will be removed and symptoms will be eliminated. Human cases of this disease have been reported in Northeast China and Shanxi. Infectious disease (1) forest encephalitis: it is an acute infectious disease of nervous system caused by forest encephalitis virus, and it is a natural focus disease in forest areas. Ixodes persulcatus is the main vector tick species in China. The virus can be preserved in ticks for a long time, passed on to the next generation or the third and fourth generations through metamorphosis and eggs, and can overwinter in ticks. The disease mostly occurs in May-August, mainly distributed in the forest areas of Heilongjiang and Jilin provinces in China, and the patients are mainly loggers. In addition, cases have also occurred in Sichuan, Hebei, Xinjiang, Yunnan and other provinces. ⑵ Xinjiang hemorrhagic fever: It is a tick-borne acute infectious disease and a natural focus disease in desert pasture. The pathogen is tick-borne RNA virus. Sheep and Tarim rabbits in epidemic areas are the main sources of infection, and patients in acute stage can also be infected. The vector is mainly ticks, and the pathogen can be preserved in ticks for several months and spread through eggs. The disease is not only transmitted by ticks, but also infected by sheep blood through skin wounds and after medical personnel contact with fresh blood of acute patients. It is prevalent in Xinjiang, China, and the patients are mainly herders, with the peak incidence in April-May. (3) Tick-borne relapsing fever: also known as endemic relapsing fever, is the natural focus of leptospirosis transmitted by ticks, with irregular intermittent fever as the main clinical feature. The disease is prevalent in Xinjiang, China, and its pathogen is Spirogyra persica in towns and villages in southern Xinjiang, and ticks with blunt mastoid edges are the transmission media. The wild type of northern Xinjiang is Plasmodium latishevi, and ticks with blunt edges are the transmission vectors. Pathogens can be transmitted through eggs. Ticks with blunt mastoid edges can be transmitted through eggs for 8 generations and can be preserved for 14 years. Animals are mainly infected by rodents, and patients can also be used as the source of infection of this disease. ⑷ Lyme disease: It was first discovered in Hailin County, Heilongjiang Province 1985 in the summer. The pathogen is Borrelia B.burgdorferi, which is a natural focus disease transmitted by Ixodes, and it mostly occurs in spring and summer. Ixodes persulcatus is the main vector in China, and some small wild rodents are the storage hosts. The disease is widely distributed, and cases have been reported in more than 20 countries on five continents. It has been confirmed that the disease is prevalent in 20 provinces, municipalities and autonomous regions in China. ⑸Q fever: The pathogen is Kirks berghei tick. The clinical feature of this disease is sudden onset. It is often spread between wild animals (rodents) and livestock, and cattle and sheep are the main sources of Q fever. The mode of infection is mainly transmitted through respiratory inhalation, but also through the bite of digestive tract and ticks and fecal pollution of wounds. Pathogens can exist in ticks for a long time and spread through eggs. For example, ticks with blunt mastoid edges can store pathogens for 2 ~ 10 years. The disease is distributed all over the world, and Q fever has been diagnosed in more than ten provinces, municipalities and autonomous regions in China. Natural infections were found in endemic areas, such as Urtica minuta, Rhinococcus yadongensis and Haemaphysalis minimus. (6) North Asian tick-borne rickettsia: also known as Siberian tick-borne typhus. The pathogen is Rickettsia sibirica. Small rodents are the main source of infection, while Dermatophagoides marginatus is the main vector. This pathogen can be transmitted through eggs and can survive in ticks for 2 years. Pathogens can be infected by tick bites or tick feces pollution. This disease is found in Xinjiang, Inner Mongolia and Heilongjiang. (7) Bacterial diseases: Ticks can spread some bacterial diseases, such as plague, brucellosis and hare fever. Ticks can preserve some pathogenic bacteria for a long time and spread through eggs. For example, Yersinia pestis can be preserved for 509 days in grassland tick adults; Thermobacillus rabbit can survive for 200 ~ 700 days in Lahorella, so ticks play a role in preserving the natural foci of these diseases. (8) Heteromorphism: Mites will spread a kind of "phagocytic cell anaplasma", which will reduce platelets and white blood cells. Therefore, the industry calls this disease "anaplasmosis". But so far, only the United States and Europe have isolated pathogens from tick bites. Edit the precautionary principle in this paragraph 1. Environmental prevention and control grassland adopts grassland rotation grazing and grassland isolation to kill ticks. Combine reclamation, remove weeds and shrubs, clean livestock pens, block holes, and prevent ticks from breeding; Kill rodents. 2. Chemical control of ticks can be sprayed with dichlorvos, malathion and fenitrothion. The use of BHC aerosol in forest areas has achieved good results, and livestock can kill ticks regularly through medicinal bath. (bhc should be a banned pesticide. Personal protection When entering the area with ticks, you should put on five tight clothes, stockings and boots, and wear a protective cap. Exposed parts should be coated with repellent, and they should check each other when leaving, so as not to take ticks out of the epidemic area. ● Insect control Because ticks mainly inhabit grasslands and forests, it is best to spray mosquito repellent on bare skin when going out to play, and try to avoid sitting and lying in the wild for a long time. Pay attention to personal protection and wear tight, light-colored and smooth long-sleeved clothes. Ticks often attach to the scalp, waist, armpit, groin, ankle and other parts of the human body. ● Insect removal If ticks are found to be attached to the body, they should be removed immediately with tools such as tweezers. Because ticks may contain infectious pathogens, do not directly remove ticks by hand or crush them with your fingers. Edit the clinical features of this paragraph. 1. Etiology: It is caused by the mouthparts of Ixodes or ticks penetrating into the skin. 2. Rash features: edematous papules or nodules, redness, blisters or ecchymosis, and insect bite marks in the center. Ticks can sometimes be found. Third, conscious symptoms: itching or pain. Tick paralysis: it is caused by neurotoxin in tick saliva, which is common in children. It shows acute ascending paralysis and can die of respiratory failure. Five, tick bite fever: ticks have fever, chills, headache, abdominal pain, nausea, vomiting and other symptoms a few days after sucking blood. Edit the preventive measures in this paragraph 1. If you find it, don't take it out yourself. Go to the hospital in time. The doctor will disinfect around the wound, anesthetize the ticks on the wound under anesthesia, and then gently twist them when the ticks are completely anesthetized. ) 2. When the tick drills its head into the skin, its head is pulled tighter and tighter, and it is easy to leave its head in the skin. If it is taken out by itself, it is easy to continue to be infected. It is extremely troublesome to go to the hospital to get the head again. If you are bitten by a bug, you can't kill it at once. Insects should blow him away, otherwise the toxin will be even bigger. 4. Prevention and treatment of ticks: First, when you find ticks that stay on the skin, don't tear them hard to prevent secondary skin damage caused by tearing tissue or broken mouthparts. Chloroform, ether, kerosene, turpentine or dry tobacco can be applied to the head of ticks until they naturally fall off from the skin. Second, disinfect the wound. If the mouth breaks into the skin, it should be removed by surgery. Third, 0.5% procaine was partially blocked around the wound. Fourth, symptoms of systemic poisoning can be given antihistamines and corticosteroids. When fever and paralysis of ticks are found, besides supporting treatment, corresponding symptomatic treatment and timely rescue should be carried out. Personal protection: wear protective clothing when entering the area where ticks are infested, and tighten the trouser legs, cuffs and neckline. Exposed parts should be rubbed with insect repellent (DEET, DEET, Peucedanum peucedanum volatile oil), or clothes should be soaked with insect repellent. Check with each other when you leave, and don't take ticks home. [1] Edit this infected case. Many villagers in Shangcheng County, Henan Province died after being bitten by insects. The villagers were bitten by lice. At first, they had a high fever, then their platelets and white blood cells dropped sharply, and finally they died of multiple organ failure. In the summer of 20 10, many people were bitten by a bug called ticks, which caused panic among the villagers. It is understood that there were deaths in the local area last year, but this year there were many deaths, which became the "hardest hit area" for ticks. At present, the pathogen has not been isolated in China, and its transmission route is not clear. International research only knows that the virus carried by ticks can infect human cells, leading to a sharp decline in human platelets and white blood cells, which is contagious. The reporter's investigation found that since last year, there has been a misdiagnosis of ticks in the primary hospitals in Shangcheng County. The villagers reported that some hospital medical staff did not deal with the disease in accordance with the Law on the Prevention and Control of Infectious Diseases. During the investigation, the health departments of Xinyang City and Shangcheng County all indicated that they could not provide the specific number of suspected cases and epidemic situation. Local villagers believe that only information disclosure can stop panic. Wu Dezheng curled up in bed, and the 73-year-old Chinese doctor kept twitching. He held out his hand as if to grab something, and intermittently shouted, "Oh, my God, I hurt ..." He had a high fever, coughing up blood, vomiting and diarrhea, and his platelets and white blood cells were decreasing. After groaning for three or four days, multiple organ functions failed one after another. On June 1 1, Wu Dezheng died, leaving behind a video of his son's struggle and a large number of medical books. Before his death, Wu Dezheng was diagnosed as "fever with thrombocytopenia syndrome", which was caused by tick bites. Poisonous insects appeared in Shangcheng County, Henan Province. Yang Fu, director of Nanchong Village in Fushan Township, told reporters that Shangcheng County is the hardest hit area for ticks. There should be hundreds of people bitten in the county, and many cases have died. How do ticks enter the human body? Ticks generally appear in mountainous areas with plants and animals. Not every tick carries a pathogen. There are similar ticks in Jinzhai County, Anhui Province, Dabie Mountain, which are generally transmitted to people through animals or plants. Not all ticks carry pathogens. When they were young, they were often found in poultry and cattle. When they are born, ticks are very small, just like dust spots under fingernails. It's not easy to find. I personally know that this kind of tick usually doesn't easily enter people's bodies. It will roll to the ground through skin contact and blood sucking, and eventually the blood in the body will become round. This kind of blood can be digested by ticks for at least a few days, so ticks can easily enter the human body to suck blood through contact between animals and people. It was once found in students in Zaohe Village, Tiechong Township, Jinzhai County, Anhui Province in Dabie Mountain area, and it was very small and difficult to be found. This tick will also survive. Usually, people who have been sucked with blood will have erythema, which is particularly itchy. People will scratch the affected area for a long time, which will lead to infection. I had this experience when I was a child. Dew is easy to appear in spring and autumn, and there are many such ticks on my legs when I walk on the road at dawn in the morning. If there is a similar situation, don't worry, find a clearing to sit down and crush ticks with your thumb nails. If you find a bite, check the affected area and remove ticks in time. [2] This summer, in Shangcheng County, Henan Province, many people were killed by a bug called ticks, which caused panic among the villagers. It is understood that there were deaths in the local area last year, but this year there were many deaths, which became the "hardest hit area" for ticks. How can a small tick kill people? How to prevent and deal with ticks after they are found? Acari ticks belong to Acari superfamily. Adult worms have shield plates on their backs and strong crusting ability, commonly known as Ixodes, belonging to Ixodes; Commonly known as soft ticks without shields, they belong to the family of soft ticks. About 800 species have been found in the world, including about 700 species of Ixodidae, about 150 species of soft ticks and about 1 species of nano ticks. There are about 100 species of Ixodidae recorded in China, and about 10 species of Ixodidae. Tick is a temporary parasite on the body surface of many vertebrates, and it is the transmission medium and storage host of some human and animal diseases. Damage 1. It's about the size of a nail. After landing on a person, drill into the body and drill into the brain. 2. After a tick bites a person, it will emit an anesthetic, and it will bury its head in the skin to suck blood. At the same time, it will secrete a substance harmful to human body. Enter the human body and take it out in time. If it is not taken out in time: if it is light, the patient will itch unbearable in rainy weather a few years later. In severe cases, persistent high fever, deep coma and convulsions can cause forest encephalitis. There are two patients on TV. The first patient took out his head and left it on his skin. After the cure, he was paralyzed and unable to stand on his own feet. Clinical characteristics of tick bite injury: 1. Etiology: It is caused by the mouthparts of Ixodes or Soft Ticks penetrating into the skin. 2. Rash features: edematous papules or nodules, redness, blisters or ecchymosis, and insect bite marks in the center. Ticks can sometimes be found. Third, conscious symptoms: itching or pain. Tick paralysis: it is caused by neurotoxin in tick saliva, which is common in children. It shows acute ascending paralysis and can die of respiratory failure. Five, tick bite fever: fever, chills, headache, abdominal pain, nausea, vomiting and other symptoms within a few days after blood sucking. Prevention 1, if found, don't take it out by yourself and go to the hospital in time. The doctor will disinfect around the wound, anesthetize the ticks on the wound under anesthesia, and then gently twist them when the ticks are completely anesthetized. ) 2. When the tick drills its head into the skin, the head is pulled tighter and tighter, and it is easy to leave the head in the skin to continue infection when it is taken out by itself. It is extremely troublesome to go to the hospital to get the head again. If you are bitten by a bug, you can't kill it at once. Insects should blow him away, otherwise the toxin will be even bigger. 4. Prevention and treatment of ticks: First, when you find ticks that stay on the skin, don't tear them hard to prevent secondary skin damage caused by tearing tissue or broken mouthparts. Chloroform, ether, kerosene, turpentine or dry tobacco can be applied to the head of ticks until they naturally fall off from the skin. Second, disinfect the wound. If the mouth breaks into the skin, it should be removed by surgery. Third, 0.5% procaine was partially blocked around the wound. Fourth, symptoms of systemic poisoning can be given antihistamines and corticosteroids. When fever and paralysis of ticks are found, besides supporting treatment, corresponding symptomatic treatment and timely rescue should be carried out. Personal protection: wear protective clothing when entering the area where ticks are infested, and tighten the trouser legs, cuffs and neckline. Exposed parts should be rubbed with insect repellent (DEET, DEET, Peucedanum peucedanum volatile oil), or clothes should be soaked with insect repellent. Check with each other when you leave, and don't take ticks home.