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Serotype determination for Streptococcus agalactiae (Group B Streptococcus)

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*Accredited by the Standards Council of Canada to Laboratory no. 594 (ISO/IEC 17025)

Requisition Forms

Reference Details


The determination of serotype for Streptococcus agalactiae (Group B Streptococcus).

Test Category:
Streptococcus agalactiae
Illnesses and Diseases:
  • Neonatal infections

Pure culture, presumptively identified as S. agalactiae, isolated from a normally sterile site (such as blood or CSF).

Specimens may be subject to rejection if they are not the appropriate sample type, have insufficient volume, or are not accompanied by relevant patient information.

Collection Method:

Isolate provided on culture medium.

Specimen Processing, Storage and Shipping:

Send as growth on culture medium (preferred) or on a swab in transport medium.  Chocolate or charcoal media are recommended.  Cultures can be also shipped frozen on dry ice. 

Transportation of Dangerous Goods:

Shipping of specimens shall be done by a TDG certified individual in accordance with TDG regulations. For additional information regarding classification of specimens for the purposes of shipping, consult either Part 2 Appendix 3 of the TDG Regulations or section 3.6.2 of the IATA Dangerous Goods Regulations as applicable.

Patient Criteria:

Isolates from infants less than 1 month of age with invasive disease due to Streptococcus agalactiae may be submitted.

Accompanying Documentation:

Completed Isolate Submission Requisition for Streptococcus form including sender lab name, address and telephone number.  Patient age or date of birth, sex, culture reference number, clinical source, date collected and test requested. 


Isolates of Streptococcus agalactiae isolated from contacts of infected infants may also be submitted for testing.

Methods and Interpretation of Results:

*Serotyping using whole genome sequencing (primary) (4)

Serotyping using latex agglutination (secondary) (1)

Turnaround Time:

30 days*

Urgent isolates will be granted priority status and completed as soon as possible.

*Turn around times may not be guaranteed when isolates are submitted in large batches.

Phone #: (204) 789-6063; STI: (204) 784-5995
Fax: (204) 789-2140
  1. H.-C Slotved et al. Latex assay for serotyping of Group B Streptococcus Isolates. J Clin Microbiol.  2003;41:4445-4447.
  2. Baharak Afshar et al. International External Quality Assurance for laboratory identification and typing of Streptococcus agalactiae (Group B Streptococci).  J Clin Microbiol. 2011;49:1475-1482.
  4. Kapatai, G.; Patel, D.; Efstratiou, A.; Chalker, V. J. Comparison of Molecular Serotyping Approaches of Streptococcus Agalactiae from Genomic Sequences. BMC Genomics 2017, 18 (1), 429.
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