Clusters of sudden unexplained death associated with the mushroom, Trogia venenata, in rural Yunnan Province, China.

Introduction: Since the late 1970's, time-space clusters of sudden unexplained death (SUD) in northwest Yunnan, China have alarmed the public and health authorities. From 2006-2009, we initiated enhanced surveillance for SUD to identify a cause, and we warned villagers to avoid eating unfamiliar mushrooms.

Methods: We established surveillance for SUD, defined as follows: sudden onset of serious, unexplained physical impairment followed by death in <24 hours.

[Surveillance on iodized salt in China, in 2006].

Objective: To understand the national situation of quality and consumption of iodized salt at production and household levels.

Methods: Detailed surveillance method could be found in 'national iodized salt surveillance scheme', issued by MOH in 2004. The iodine concentrations in salt (except some special kinds of salt) were detected by direct titration with national standard of GB/T 13025.