Appendectomy and the clinical course of ulcerative colitis: A retrospective cohort study and a nested case-control study from Korea

2015 ◽  
Vol 30 (3) ◽  
pp. 470-477 ◽  
Author(s):  
Ho-Su Lee ◽  
Sang Hyoung Park ◽  
Suk-Kyun Yang ◽  
Seon-Ok Kim ◽  
Jae Seung Soh ◽  
...  
Keyword(s):  
Ulcerative Colitis ◽  
Cohort Study ◽  
Retrospective Cohort Study ◽  
Retrospective Cohort ◽  
Case Control Study ◽  
Clinical Course ◽  
Case Control ◽  
Nested Case Control ◽  
Control Study

First norovirus outbreaks associated with consumption of green seaweed (Enteromorpha spp.) in South Korea

2014 ◽  
Vol 143 (3) ◽  
pp. 515-521 ◽  
Author(s):  
J. H. PARK ◽  
H. S. JEONG ◽  
J. S. LEE ◽  
S. W. LEE ◽  
Y. H. CHOI ◽  
...  
Keyword(s):  
Cohort Study ◽  
Relative Risk ◽  
Confidence Interval ◽  
Retrospective Cohort Study ◽  
Retrospective Cohort ◽  
Case Control Study ◽  
Case Control ◽  
Green Seaweed ◽  
Norovirus Gii ◽  
Control Study

SUMMARYIn February 2012, an outbreak of gastroenteritis was reported in school A; a successive outbreak was reported at school B. A retrospective cohort study conducted in school A showed that seasoned green seaweed with radishes (relative risk 7·9, 95% confidence interval 1·1–56·2) was significantly associated with illness. Similarly, a case-control study of students at school B showed that cases were 5·1 (95% confidence interval 1·1–24·8) times more likely to have eaten seasoned green seaweed with pears. Multiple norovirus genotypes were detected in samples from students in schools A and B. Norovirus GII.6 isolated from schools A and B were phylogenetically indistinguishable. Green seaweed was supplied by company X, and norovirus GII.4 was isolated from samples of green seaweed. Green seaweed was assumed to be linked to these outbreaks. To our knowledge, this is the first reported norovirus outbreak associated with green seaweed.

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