Related Experiment Video
Updated: Jun 13, 2026

Capsular Serotyping of Streptococcus pneumoniae by Latex Agglutination
Published on: September 25, 2014
[Resistance and serotype of 123 strains of Streptococcus pneumoniae]
Hong-Yu Ren1, Xiao-Lei Wang, Ma-Chao Li
1State Key Laboratory for Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
Objective:
To investigate antibiotic resistance and the prevalence of serotype of Streptococcus pneumoniae.
Methods:
Totally 123 strains of S. pneumoniae were collected to test the susceptibility of 6 antibiotics by K-B method according to the standard of CLIS. Serotyping of S. pneumoniae was performed by using quelling reaction.
Results:
Among 123 strains of S. pneumoniae, all strains (100%) were resistant to AZM. There were 65.04%, 78.05%, 19.51%, 0.81%, 0% of S. pneumoniae were resistant against the MH, SXT, C, RA, OFX respectively. 11 serotypes were involved in 123 strains. The prevalent serogroup were 6, 14, 15, 19 and 23.5 strains were unable to serotype. The multi-resistant strains of S. pneumoniae included in serogroup 6 and 19.
Conclusion:
The antibiotic resistance of S. pneumoniae is very serious. Most of them are multi-resistant strains. The prevalent serogroup, especially of the multi-resistant strains, are 6 and 19 serogroup.
Insights
Antibiotic resistance in Streptococcus pneumoniae is a serious concern, with all tested strains resistant to azithromycin (AZM). Prevalent multi-resistant serotypes include 6 and 19, highlighting urgent public health implications.
Area of Science:
- Microbiology
- Infectious Diseases
- Antimicrobial Resistance
Context:
- Streptococcus pneumoniae is a leading cause of bacterial infections worldwide.
- Antibiotic resistance poses a significant threat to effective treatment.
- Understanding serotype distribution is crucial for vaccine development and public health strategies.
Purpose:
- To determine the antibiotic resistance patterns of Streptococcus pneumoniae isolates.
- To identify the prevalence of different serotypes among these isolates.
- To investigate the association between serotype and antibiotic resistance.
Summary:
- This study analyzed 123 strains of Streptococcus pneumoniae for antibiotic susceptibility and serotyping.
- All strains exhibited resistance to azithromycin (AZM), with high resistance rates also observed for macrolides (MH) and trimethoprim-sulfamethoxazole (SXT).
- Eleven serotypes were identified, with serogroups 6, 14, 15, 19, and 23 being most prevalent. Notably, serogroups 6 and 19 harbored the majority of multi-drug resistant strains.
Impact:
- The findings underscore the critical issue of antibiotic resistance in Streptococcus pneumoniae.
- The prevalence of multi-resistant strains, particularly within serogroups 6 and 19, necessitates targeted interventions.
- This data is vital for informing clinical treatment guidelines and guiding the development of new antimicrobial strategies and vaccines.
Related Concept Videos
Atypical Pneumonia
Mechanism of Antibiotic Resistance in MRSA
Bacterial Meningitis II: Pathophysiology
Pneumonia I: Introduction
Pneumonia I: Introduction
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...
Streptococcal Pharyngitis

