Volume 20, Number 7—July 2014
Synopsis
Epidemiology, Clinical Manifestations, and Outcomes of Streptococcus suis Infection in Humans
Table 1
Characteristics of 177 articles in a systematic review of Streptococcus suis infection
| Characteristic | Articles, no. (%) | Cases reported, no. (%)* |
|---|---|---|
| Geographic region† | ||
| Europe | 98 (55) | 168 (11) |
| Western Pacific | 47 (27) | 836 (53) |
| SouthEast Asia | 24 (14) | 572 (36) |
| Americas | 8 (5) | 8 (0.5) |
| Type of study design | ||
| Case report | 130 (73) | 151 (7) |
| Case series | 20 (11) | 511 (25) |
| Cross-sectional | 21 (12) | 761 (37) |
| Outbreak investigation | 5 (3)‡ | 532 (26) |
| Case–control | 1 (1) | 101 (5) |
| Data collection approach | ||
| Retrospective | 159 (90) | 1299 (63) |
| Prospective | 15 (9) | 697 (34) |
| Both§ | 3 (1) | 60 (3) |
| Language of publication¶ | ||
| English | 130 (74) | 1947 (95) |
| Spanish | 13 (7) | 15 (1) |
| French | 12 (7) | 13 (1) |
| Other# | 22 (12) | 81 (4) |
| Year of publication | ||
| 1968–1980 | 13 (7.5) | 18 (1) |
| 1981–1990 | 27 (15) | 95 (5) |
| 1991–2000 | 32 (18) | 119 (6) |
| 2001–2005 | 28 (16) | 115 (6) |
| 2006–2010 | 55 (31) | 1052 (51) |
| 2011–2012 | 22 (12.5) | 659 (32) |
⃰Case duplicates were removed in the counts for the geographic region subheading (totaling 1,584 cases, no duplicates). Duplicates were not removed in the counts for other subheadings (totaling 2,056 cases, with duplicates).
†Geographic regions as defined by the World Health Organization.
‡Includes 3 articles reporting about the patients in the Sichuan outbreak in China; each was included for analysis of different factors.
§Included in the prospective groups in subsequent analyses.
¶Almost all large studies were published in English. Most reports in languages other than English were case reports.
#German (7 articles); Dutch (4); Czech, Italian, and Japanese (2 each); Chinese, Polish, Serbian, Swedish, and Thai (1 each).
1These authors contributed equally to this article.