Case–case study of a Salmonella outbreak: An epidemiologic method to analyse surveillance data

Determining Risk Factors of a Non-Point Source Outbreak of Campylobacter Cases Using Case-Case and Case-Control Studies

“…Unlike reported studies where the case-case and case-control studies resulted in similar findings [4,37,38], identified risk factors differed somewhat between study designs. This may be explained by slight differences in questionnaire design between the two studies.…”

“…While the recruitment goal was a 2:1 match of controls to cases, this did not occur in all the age groups, particularly among boys (age [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. This group represented 33% of all cases reported from outbreak cases but only 13% of the phone controls.…”

“…Developing rapid, minimal resource methods to identify factors associated with an outbreak could lead to more consistent and timely response. Case-case studies are a potential alternative for some outbreak investigations [1][2][3][4][5]. Case-case designs have been utilized in studies of other diseases such as cancer [6] and more recently been used for enteric diseases [4,[7][8][9].…”

“…Case-case studies are a potential alternative for some outbreak investigations [1][2][3][4][5]. Case-case designs have been utilized in studies of other diseases such as cancer [6] and more recently been used for enteric diseases [4,[7][8][9]. In this study, historical cases from surveillance data were compared to outbreak cases to identify the possible source contributing to an increase in cases.…”

Till receipts - a new approach for investigating outbreaks? Evaluation during a large Salmonella Enteritidis phage type 14b outbreak in a north west London takeaway restaurant, September 2009

“…Alternative study designs have been used, such as, case-crossover studies [6], case severity studies [1] and serotype case-case studies [5,[7][8][9]. In addition, analyses-of-sales studies have been reported [10,11].…”