Objective To investigate the current situation and relevant factors related to the onset of Keshan disease (KSD) in Ju County of Shandong Province.Methods In 2012,one natural village was selected by means of random number table as the investigating site in Qishan,Anzhuang and Longshan towns,respectively,in KSD endemic areas of Ju County.Permanent residents of all age groups were taken as observation subjects.Then,clinical examination including electrocardiography (ECG) and X-ray for suspected patients was carried out.Fifteen hair samples were collected in every investigating site for detecting selenium content by fluorescence method.At the same time,economic income and per capita share of grain were investigated.Results There were 925 residents investigated in the 3 investigation sites and 27 cases of KSD were found; the total incidence rate was 2.92％.Among the 925 residents investigated,158 cases showed abnormal ECG,and total incidence of abnormal ECG was 17.08％.Among 11 X-ray films,5 cases of cardiac enlargement were found.The selenium content of hair was (0.430 ± 0.062) mg/kg; the average economic income was 9 561 yuan,and the per capita share of grain was 820 kg.Conclusions The incidence rate of KSD in Ju County is low and steady.Keshan disease is controlled in Ju County.

Objective To analyze the assessment results of external quality control and network operation of urinary iodine in local laboratories of Shandong Province,to evaluate the ability of consistent analysis; and to provide a reliable laboratory quality assurance for epidemiological surveillance and control of iodine deficiency disorders (IDD) and reliable decision-making.Methods Z-scores of the assessment results of external quality control of urinary iodine in local laboratories of Shandong Province were analyzed from 2000-2013.Results The feedback rate of urinary iodine in local laboratories of ShandongProvince was 100.0％ from 2000-2013; the qualified rate was 100.0％(14/14),100.0％(14/14),92.9％(13/14),100.0％(14/14),92.9％(13/14),100.0％ (14/14),100.0％ (14/14),100.0％ (14/14),92.9％ (13/14),100.0％ (17/17),100.0％ (17/17),94.1％ (16/17),100.0％ (17/17),and 100.0％ (17/17),respectively.The total qualified rate of Z-scores between Zs in local laboratories was 100.0％ (214/214)and within Zs was 98.6％ (211/214).Conclusion The test abilities of urinary iodine in local laboratories of Shandong Province are steady; the overall results are satisfactory,but some laboratories need to improve.