TABLE 1.
Description of Listeria monocytogenes clinical isolates from 2013 and 2014 pseudo-outbreaks in the United States
| Parameter | 2013 Pseudo-outbreak | 2014 Pseudo-outbreak |
|---|---|---|
| No. of isolates | 23 | 27 |
| Isolation dates | 13 January to 27 March 2013 | 16 April to 28 May 2014 |
| Median age of patients (range), yr | 57 (1–81) | 62 (2–89) |
| Specimen source, no. (%) | ||
| Urine | 14 (61) | 10 (37) |
| Wound/abscess | 6 (26) | 14 (52) |
| Othera | 3 (13) | 3 (11) |
| States from which clinical isolates were identified | California, Florida, Michigan, Ohio, Tennessee, Washington | California, Georgia, Michigan, Mississippi, New Mexico, New York, Oklahoma, Washington |
a
Other specimen sources in 2013 include 1 gastric aspirate, 1 percutaneous gastrostomy tube, and 1 cerebrospinal fluid. Other specimen sources in 2014 include 1 sputum, 1 blood, and 1 unknown sample.