Table 1. Frequency of Salmonella species and subspecies reported to the NESP, 2006–2019.
| Species | Subspecies | Total reports | Blood reports | ||
|---|---|---|---|---|---|
| Number of serovars | Number of isolates | Number of serovars | Number of isolates | ||
| Salmonella enterica | enterica (I) | 574 | 94,972 | 139 | 4,218 |
| salamae (II) | 40 | 80 | 2 | 2 | |
| arizoniae (IIIa) | 19 | 104 | 4 | 5 | |
| diarizonae (IIIb) | 95 | 285 | 4 | 4 | |
| houtenae (IV) | 24 | 199 | 4 | 9 | |
| indica (VI) | 1 | 1 | 0 | 0 | |
| Salmonella bongori | NA | 1 | 1 | 0 | 0 |
Abbreviations: NA, not applicable; NESP, National Enteric Surveillance Program
The bacteremia rate of subspecies I was 4.4% (95% CI: 4.3%–4.6%). With the exception of subspecies IIIb, this rate did not differ significantly from those of the other subspecies even when they were analyzed as an aggregate group to reduce the imprecision associated with low numbers of isolates (P=0.0728, Figure 3). The bacteremia rate of subspecies IIIb, 1.4% (95% CI: 0.5%–3.5%), was significantly lower than that of other subspecies I (P=0.0087).