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Infection. 2017 Aug;45(4):449-458. doi: 10.1007/s15010-017-0995-2. Epub 2017 Feb 25.

Group B streptococcal disease in infants in the first year of life: a nationwide surveillance study in Japan, 2011-2015.

Author information

1
Department of Pediatrics, Nishi-Kobe Medical Center, 5-7-1 Kojidai, Nishi-ku, Kobe, 651-2273, Japan. kskmatsu@s4.dion.ne.jp.
2
Department of Pediatrics, Sanno Hospital, Tokyo, Japan.
3
Department of Neonatology, Tokyo Metropolitan Children's Medical Center, Tokyo, Japan.
4
Division of Infectious Diseases, National Center for Child Health and Development, Tokyo, Japan.
5
Department of Neonatology, Ibaraki Children's Hospital, Ibaraki, Japan.
6
Department of Pediatric Intensive Care, Shizuoka Children's Hospital, Shizuoka, Japan.
7
Department of General Pediatrics, Nagano Children's Hospital, Azumino, Nagano, Japan.
8
Department of Neonatology, Okinawa Chubu Hospital, Uruma, Okinawa, Japan.

Abstract

PURPOSE:

This study aimed to describe the epidemiology of childhood group B streptococcus (GBS) disease including late late-onset disease (LLOD) and to clinically characterize recurrent cases and twin-sibling cases in Japan.

METHODS:

We collected information on infants (<1 year of age) with invasive GBS disease and institutional information about births and transfers through a nationwide questionnaire between 2011 and 2015.

RESULTS:

We identified 133 infants with early-onset disease (EOD), 274 late-onset disease (LOD), and 38 LLOD from 149 institutes. The case fatality rate (CFR) of EOD, LOD, and LLOD was 4.5, 4.4, and 0%, respectively. CFR in EOD was significantly (P < 0.001) associated with preterm birth, but not that in LOD and LLOD. Twenty-nine percent of infants with meningitis (49/169) had neurologic sequelae. We showed clinical details of 12 recurrent cases that accounted for 2.8% of the total patients, and 4 sets of both twins affected; 4 of 12 recurrent cases and 3 of 4 twin-sibling sets were also associated with preterm birth. Based on the livebirth number of 581,488, the instituted-based incidence of EOD, LOD, and LLOD was estimated as 0.09 (95% CI 0.06-0.11), 0.12 (95% CI 0.11-0.14), and 0.01 (95% CI 0.01-0.02) per 1000 livebirths, respectively.

CONCLUSIONS:

CFR of EOD and LOD in Japan is comparable with that in high-income European countries or the United States, and their incidence is much lower. Our findings also describe the clinical details of LLOD, recurrent infections, and infections in twin siblings. This study is the largest among Asian childhood GBS studies ever reported.

KEYWORDS:

Epidemiology; Group B Streptococcus; Japan; Recurrence; Streptococcus agalactiae; Twin

PMID:
28236250
DOI:
10.1007/s15010-017-0995-2
[Indexed for MEDLINE]

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