Table 4.
Temporal clusters of Salmonella enterica serovars isolated from environmental samples submitted through the Ontario Hatchery and Supply Flock Policy between 2009 and 2018, by major poultry commodities (p ≤ 0.05).
| Poultry Commodity | Serovar + | First Cluster ++ | Second Cluster ++ | Third Cluster ++ |
|---|---|---|---|---|
| Broiler breeders | Enteritidis (25) | 2015/5–2018/7 # (21) | ||
| Heidelberg (131) | 2011/8–2013/12 (52) | |||
| Kentucky (289) | 2009/9–2013/12 (159) | |||
| Typhimurium (37) | 2017/9–2017/12 (10) | |||
| Layer breeders | Infantis (32) | 2009/1–2011/6 (14) | ||
| Turkey breeders | Agona (34) | 2010/8–2013/3 (28) | 2015/9–2016/5 (6) | |
| Albany (60) | 2014/1–2018/11 (57) | 2012/12–2013/3 (3) | ||
| Hadar (61) | 2010/2–2012/8 (38) | 2018/9–2018/12 (14) | ||
| Heidelberg (132) | 2012/4–2013/9 (83) | 2014/10–2015/11 (27) | 2009/5–2013/10 (21) | |
| Liverpool (22) | 2015/4–2018/10 (22) | |||
| Livingstone (81) | 2012/11–2013/10 (44) | 2011/12–2012/6 (11) | ||
| Mbandaka (39) | 2015/2–2018/11 (39) | |||
| Newport (27) | 2017/4–2017/9 (12) | 2010/12–2011/6 (6) | ||
| Orion (64) | 2010/2–2011/11 (57) | 2012/2–2012/10 (5) | ||
| Schwarzengrund (323) | 2015/4–2017/11 (178) | |||
| Senftenberg (176) | 2018/7–2018/12 (32) | |||
| Typhimurium (39) | 2015/6–2016/3 (10) | |||
| Uganda (132) | 2017/2–2018/12 (118) | 2011/6–2011/12 (10) | 2016/9–2016/12 (4) |
Iterative temporal scan performed using SaTScan v9 (Kulldorff, 2018). The scanning window size was 50% of the study period. + Total number of isolates for each serovar. ++ Number of isolates within the cluster. # Dates are given as year/month. A submission could be counted more than once because some submissions tested positive for more than one serovar.