猩红热是法定乙类呼吸道急性传染病。多由B型A组溶血性链球菌感染引起。从潜伏期末到皮肤脱屑前均有传染性,约10～21日。但经治疗可缩短为1～2天。发病率多在40～80/10万之间波动,流行于冬春两季。发病年龄多集中于8～12岁,约占发病率的70～90％。此症大多数发生于小学生。其发病机理是B型 Scarlet fever is a statutory class B respiratory acute infectious disease. More by the B group A hemolytic streptococcus infection caused. From the end of the incubation period until the skin desquamation are contagious, about 10 to 21 days. However, after treatment can be shortened to 1 to 2 days. The incidence rate fluctuated between 40-80 / 100,000, popular in winter and spring. Age of onset and more concentrated in 8 to 12 years old, accounting for about 70% to 90% of the incidence. Most of this disease occurs in primary school students. Its pathogenesis is type B.