Dendrolimus osteoarthritis

Pine caterpillar osteoarthritis is a seasonal regional outbreak epidemic that has been found in southern provinces of China in recent years. It is a disease mainly involving skin, bone and joints. Epidemiological investigations and animal experiments have proved that the disease is related to contact with pine caterpillars, so it is named as pine caterpillar disease. In terms of incidence, it has been reported in nine provinces including Guangdong, Fujian, Guangxi, Hunan, Hubei, Anhui, Zhejiang, Jiangxi, and Jiangsu. In 1970, an employee of a kiln factory in Jinhua, Zhejiang, became ill because of firing a pine branch with pine caterpillars, which was the earliest reported case in China. In 1975, there were 4010 cases in Chaoyang, Guangdong, accounting for 5.54% of the total population. The incidence of pine caterpillar population is 52.9% to 86.4%. The epidemic time was the peak season in summer and autumn, the most in October. Patients ranged in age from 8 months to 84 years, with the most common among young adults aged 20-50 years. There is no difference in the prevalence of men and women, depending on the composition of the exposed population. Most of the affected areas are near mountainous areas, mainly in areas with pine forests and pine caterpillars. Most cases are cutting firewood uphill, cutting pine branches, collecting pine caterpillar cocoons, cutting rice in contaminated rice fields, and contacting pine caterpillars when students are outing in the mountains. It may also be caused by contact with weeds, clothing and clothing contaminated by pine caterpillars. Water and other diseases.