Rice farmers dermatitis
Introduction
Introduction to rice dermatitis Rice-farmer'sdermatitis refers to a kind of dermatitis that occurs during the sowing and harvesting of rice by farmers. basic knowledge Proportion of disease: rural traditional agricultural workers are more common, about 1-3% Susceptible people: no special people Mode of infection: non-infectious Complications: bacterial infection
Cause
Causes of rice dermatitis
(1) Causes of the disease
Long-term water immersion in the process of planting rice from early rice, transplanting rice, late rice, etc. is the main factor of the disease. The water temperature is high, the field water is alkaline and the mechanical friction during labor generation is the auxiliary and promoting factor. It is more common to infiltrate erosive rice dermatitis. If it is contacted with field water containing animal schistosomiasis (the final host is mainly domestic duck and cattle, the intermediate host is cone-shaped snail), the cercariae of schistosomiasis invade the skin and cause local skin inflammation, which can cause cercariae cercariae. dermatitis.
(two) pathogenesis
The high temperature of the water, the alkalinity of the field water and the mechanical friction during the labor generation process are auxiliary and facilitating factors.
Prevention
Rice dermatitis prevention
1. Strengthen personal protection: Wear plastic suits for paddy field operations, plastic liners for external use to prevent cercariae from drilling into the skin, or apply skin protectant before the paddy field, such as 15% dibutyl phthalate (DBP) ointment or emulsion. The commercially available rice-proof dermatitis rubbing agent is a dibutyl phthalate emulsion stock solution. When using, take a portion of the original solution and add 6 parts of water to shake.
2. Snail and snails combined with agricultural application of chemical fertilizers and pesticides, can choose dilute ammonia solution (ammonia water, dosage 15 ~ 25kg / acre), ammonium bicarbonate (15kg / acre), sodium pentachlorophenol (in water depth 5cm) When using 0.5 kg/mu), niclosamide (10 x 10-6), tea cake (20 kg/mu).
Complication
Rice dermatitis complication Complications bacterial infection
The main cause of this disease is itching, so patients can scratch the skin and cause skin ulceration, wound exposure, combined with patients continue to work in the field, can form infection-related complications due to skin infections, such as skin redness, pain, purulence Secretion and effluent, when the patient has low resistance and long-term use of immunosuppressive disease history, the infection can go deep into the circulatory system, leading to sepsis, so if there is skin damage should stop working, or wear gloves to protect.
Symptom
Symptoms of rice dermatitis common symptoms Windy bacteria infected pustular herpes papules itching
Impregnated erosive dermatitis: initial impingement (toe) gap and finger (toe) side skin impregnation, swelling, whitish, wrinkling, skin that has been impregnated by friction, revealing red base, a little exudate, easy to follow Bacterial infection, and prone to nail damage, paronychia, etc., a small number of patients in the palmar sacral layer thickening, can be seen most of the ring-shaped round or oval mung bean to soybean size layer peeling, the disease course is self-limiting, light Those who are no longer working in the paddy field can recover after 6 to 7 days. If the secondary infection is heavier, local redness, suppuration, adjacent lymphangitis or lymphadenitis, there may be systemic symptoms such as fever and prolongation of the disease.
Examine
Inspection of rice dermatitis
The disease mainly checks the skin lesion characteristics of the skin, and the cause of the disease and the allergic factors are also related. Peripheral blood eosinophils in patients with rice dermatitis are often significantly increased. The number of T lymphocytes was reduced, with CD8 being significantly lower. The number of B lymphocytes is usually increased. Most of the serum IgE was significantly increased. IgG, IgM may have a slight increase, and most may have a low IgA.
Diagnosis
Diagnosis and identification of rice dermatitis
More common in field workers who plant rice in large areas, the hot season is good, the skin damage is mostly located in the feet, calves, hands.
The onset is fast, and there is an itching sensation after contact with the scorpion-containing field water for a few minutes, followed by miliary red erythema, papules, and herpes. There is obvious infiltration and redness around the sputum. After the scratch, there may be wheal, severe itching, and top of the lesion. It can be seen that the cerebral palsy is drilled into the traces. The rash is scattered or densely integrated. It is located in the water contact area. It is more common in the two calves, the distal forearm and the back of the hands and feet. It is often caused by secondary infection and becomes pustule. May be associated with lymphangitis or lymphadenitis, the rash reaches a peak in 3 to 4 days, and disappears about 1 week after stopping the water, leaving pigmentation spots. Because the tail scorpion slams into the human skin and soon dies, it cannot become an adult, so it cannot Causes visceral lesions.
