A study on seasonal distribution of measles in Heping district, Shenyang, from 2001 to 2009

The data about measles cases in our district from the year 2001 to 2009 was collected and analyzed to illuminate the characters of measles in season distribution, and the methods of concentration degree and circular distribution were used in this study. The results shows that measles are more likely to happen in spring, from March to June (M=0.727, r= 0.7168, P<;;0.05). 83.28 percent of cases were reported during this period, and the annual morbidity peak date of the measles has been delayed from winter and spring to only spring. We can get the conclusion that measles has significant season characters, and that vaccine intervention has already delayed the morbidity peak time of the measles.