Early-onset neonatal sepsis by Group B Streptococcus in a Brazilian public hospital^☆

Dear Editor,

Despite the known efficacy of the intrapartum antibiotic prophylaxis (IAP),¹ no Group B Streptococcus (GBS) prophylaxis program are in place in Brazil,² and rates of early-onset sepsis (EOS) may be underestimated. We conducted a retrospective analysis on the incidence EOS, IAP use and outcomes of infants born in a Brazilian University Hospital (Hospital de Clínicas de Uberlândia, HC-U). An early-onset GBS sepsis episode was defined based on positive blood cultures in the first 72 h of postnatal life. Blood cultures for all newborn infants with suspected sepsis were performed by an automated system (Vitek 2 system BioMerieux, France). Maternal/infant demographic and clinical data were obtained from the medical records. The study was approved by the University Hospital Ethics Committee (protocol 394/09).

From January 2008 to December 2011, there were 8818 live births. Among them, we identified eight infants with confirmed early-onset GBS sepsis. The overall incidence rate was 0.90 cases per 1000 live births. Infants’ characteristics and clinical outcomes are shown in Table 1. All neonates were born vaginally. The average hospital length of stay was eight days (range: 1-36 days). The case-fatality rate was 50% (4/8), occurring in the first four days of life. Out of four newborns that survived, one had early-onset GBS sepsis associated with meningitis and coursed with neurological damage. We detected one GBS isolate resistant to erythromycin with a minimum inhibitory concentration of 8 µg/ml.

Table 1
Clinical characteristics and outcome of newborns with early-onset GBS sepsis during 2008–2011.

Case/year	Gendera	Birth weight (grams)	Gestational age (weeks)	1-min Apgar score	5-min Apgar score	Outcome
01/2008	M	1450	32	7	9	Survived
02/2008	M	3280	37	8	9	Survived
03/2009	F	2695	37	10	10	Neurological damage
04/2009	M	795	25	–	8	Deceased
05/2009	F	1520	30	2	6	Deceased
06/2009	F	1080	28	6	7	Deceased
07/2009	M	2475	36	8	10	Survived
08/2010	F	1545	32	8	9	Deceased

• ^a
  M, male; F, female.

Half of the mothers were ≤16 years old and 75% were primiparous. Most (75%) had prenatal care. Leukocytosis (>15,000 cells/mm³) was identified in two women. One woman had chorioaminiorrexis >24 h, untreated urinary tract infection and fever before labor. Another woman had fever (38.6 °C) in the first day after delivery and was also diagnosed with urinary tract infection. Although one pregnant woman had been screened for GBS during pregnancy, the positive GBS culture result was not obtained timely. The remaining seven women were not screened for GBS. Consequently, GBS colonization status of all pregnant women was unknown at delivery. None of the mothers received IAP.

Data for newborn infants cared in Brazilian's NICU show a high proportion (39.2%) of maternally acquired bloodstream infections beginning within the first 48 h after birth.³ GBS is referred as the leading etiological agent of maternal acquired infections in some Brazilians NICUs.^3,4 Our results reinforce these findings and emphasize the importance of early-onset GBS sepsis considering the high incidence (0.9 cases per 1000 live births) and the fatality rate (50%). Similarly, other authors have found an overall incidence rate of early-onset GBS sepsis ranging from 0.39 to 1 per 1000 live births,^2,5 with meningitis being detected in a large proportion (26%) of the infected newborns⁵ who had a high (60%) lethality rate.^2,5

We conclude that improvement of prenatal care is recommended in this population to decrease the burden of this maternally acquired infectious disease. Implementation of prophylactic measures should be considered an important public health strategy to avoid early-onset GBS sepsis. The best scenario would be universal culture-based screening of all pregnant women (35-37 weeks) to identify positive GBS women who should receive IAP.¹ Furthermore, use of rapid microbiologic tests could be beneficial for intrapartum screening in preterm deliveries.

• Funding
  This work was supported by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (grant 474296/2007-5 to P.P.G.F.)
• ☆
  Study conducted at the Universidade Federal de Uberlândia (UFU), Minas Gerais, Brazil.

References

• ¹
  Verani JR, McGee L, Schrag SJ. Prevention of perinatal group B streptococcal disease - revised guidelines from CDC, 2010. MMWR Recomm Rep. 2010;59:1-36.
• ²
  Evangelista ML, Freitas FT. Group B streptococcus neonatal infection in an intensive care unit in Brazil: high fatality and missed opportunities for antibiotic prophylaxis. Br J Infect Dis. 2015;19:98-9.
• ³
  Pessoa-Silva CL, Richtmann R, Calil R, et al. Healthcare-associated infections among neonates in Brazil. Infect Control Hosp Epidemiol. 2004;25:772-7.
• ⁴
  Mussi-Pinhata MM, Nobre RA, Martinez FE, Jorge SM, Ferlin ML, Goncalves AL. Early-onset bacterial infection in Brazilian neonates with respiratory distress: a hospital-based study. J Trop Pediatr. 2004;50:6-11.
• ⁵
  Vaciloto E, Richtmann R, de Paula Fiod Costa H, Kusano EJ, de Almeida MF, Amaro ER. A survey of the incidence of neonatal sepsis by group B Streptococcus during a decade in a Brazilian maternity hospital. Br J Infect Dis. 2002;6:55-62.

Publication Dates

• Publication in this collection
  Nov-Dec 2016

History

• Received
  29 Apr 2016
• Accepted
  29 July 2016