National Enteric Disease Surveillance: Salmonella Annual Report, 2013

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The Laboratory-based Enteric Disease Surveillance (LEDS) system contributes to the understanding of foodborne disease by conducting basic laboratory-based surveillance for four enteric pathogens, Salmonella, Shigella, Shiga toxin-producing Escherichia coli (STEC), and Campylobacter, using reports from state and territorial public health laboratories.

Highlights
  • The raw data reported to LEDS during 2013 can be found here.
  • In 2013, 52 jurisdictions reported 45,735 cases of laboratory-confirmed Salmonella infections to LEDS, 7% fewer than in 2012.
Incidence rates of Salmonella infection (per 100,000 population)

 

Figure 1a. Incidence rate of laboratory-confirmed human Salmonella infection reported to CDC (all serotypes), by reporting jurisdiction, United States 2013 (n = 45,735)

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* Some states were plotted using a gray color if a) the number of laboratory-confirmed human Salmonella isolates reported to LEDS was less than 80% of the number of salmonellosis cases reported to the National Notifiable Diseases Surveillance System (NNDSS) or b) the number of fully serotyped laboratory-confirmed human Salmonella isolates reported to LEDS was fewer than 80% of all Salmonella isolates reported to LEDS

Table 1a. By top 20 most reported serotypes
Rank Serotype Number reported Percent Incidence
1 Enteritidis 6928 15.1 2.19
2 Typhimurium 5853 12.8 1.85
3 Newport 3811 8.3 1.21
4 I 4,[5],12:i:- 2418 5.3 0.76
5 Javiana 2304 5 0.73
6 Heidelberg 1418 3.1 0.45
7 Infantis 1342 2.9 0.42
8 Saintpaul 1031 2.3 0.33
9 Muenchen 969 2.1 0.31
10 Montevideo 913 2 0.29
11 Braenderup 703 1.5 0.22
12 Oranienburg 699 1.5 0.22
13 Thompson 634 1.4 0.2
14 Mississippi 484 1.1 0.15
15 Agona 368 0.8 0.12
16 Typhi 365 0.8 0.12
17 Bareilly 354 0.8 0.11
18 Paratyphi B var. L(+) tartrate+ 327 0.7 0.1
19 Poona 305 0.7 0.1
20 Berta 259 0.6 0.08
Subtotal 31485 68.8
Other serotyped* 6788 14.8
Unknown serotype 5853 12.8
Partially serotyped 1388 3
Rough, mucoid, and/or nonmotile 221 0.5
Subtotal 14250 31.2
Total 45735 100
* Listed in Appendix 3
Table 1b. By age group and gender
Incidence
Age group, years Female Male
< 1 106.13 117.42
1 – 4 39.6 42.44
5 – 9 16.16 17.29
10 – 19 9.21 10.31
20 – 29 11.53 8.67
30 – 39 10.05 8.11
40 – 49 10.29 8.4
50 – 59 11.76 9.69
60 – 69 13.24 11.3
70 – 79 16.57 14.15
” 80 16.33 14.51
Overall 14.4 13.4
Historical Comparisons
Table 2. Percentage change among the 20 serotypes most frequently reported to LEDS, comparing 2003, 2008, and 2013
    Rank   Number Reported   Percentage Change
Serotype   2003 2008 2013   2003 2008 2013   2003 vs 2008 2008 vs 2013 2003 vs 2013
Enteritidis   2 1 1   4914 7225 6928   + 47 – 4.1 + 41
Typhimurium   1 2 2   6770 6524 5853   – 3.6 – 10.3 – 13.5
Newport   3 3 3   4042 3846 3811   – 4.8 – 0.9 – 5.7
I 4,[5],12:i:-   12 8 4   553 943 2418   + 70.5 + 156.4 + 337.3
Javiana   5 4 5   1718 2138 2304   + 24.4 + 7.8 + 34.1
Heidelberg   4 6 6   1845 1284 1418   – 30.4 + 10.4 – 23.1
Infantis   10 12 7   570 639 1342   + 12.1 + 110 + 135.4
Saintpaul   7 5 8   838 1831 1031   + 118.5 – 43.7 + 23
Muenchen   8 9 9   798 890 969   + 11.5 + 8.9 + 21.4
Montevideo   6 7 10   890 1094 913   + 22.9 – 16.5 + 2.6
Braenderup   11 10 11   553 658 703   + 19 + 6.8 + 27.1
Oranienburg   9 11 12   600 656 699   + 9.3 + 6.6 + 16.5
Thompson   14 18 13   509 412 634   – 19.1 + 53.9 + 24.6
Mississippi   15 17 14   451 434 484   – 3.8 + 11.5 + 7.3
Agona   13 13 15   523 610 368   + 16.6 – 39.7 – 29.6
Typhi   16 15 16   362 478 365   + 32 – 23.6 + 0.8
Bareilly   19 23 17   240 224 354   – 6.7 + 58 + 47.5
Paratyphi B var. L(+) tartrate+   17 16 18   342 477 327   + 39.5 – 31.4 – 4.4
Poona   22 14 19   211 508 305   + 140.8 – 40 + 44.5
Berta   23 29 20   201 188 259   – 6.5 + 37.8 + 28.9

 

Figure 2: Incidence rates of laboratory-confirmed human Salmonella infections reported to CDC (all serotypes and serotypes with more than 1,000 infections reported in 2013), United States, 1970–2013

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References
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Appendices