Related Experiment Video
Updated: Aug 29, 2026

Characterization of Inflammatory Responses During Intranasal Colonization with Streptococcus pneumoniae
Published on: January 17, 2014
[Microbiological, clinical and epidemiological aspects of Streptococcus pneumoniae isolates recovered over two years]
M Isabel Viciana1, M Victoria García-López, Alberto Mariscal
1Servicio de Microbiología. Hospital Universitario Virgen de la Victoria. Málaga. Spain. isaviciana@mixmail.com
Introduction:
Streptococcus pneumoniae is the most frequent cause of non-hospital acquired pneumonia and meningitis in adults, and bacterial otitis media in children. Moreover, it causes a third of all acute sinusitis cases. Penicillin has been the treatment of choice for almost 50 years. Gradually, penicillin-resistant pneumococci have appeared throughout the world. Our aim was to investigate the epidemiology, pattern of resistance and serotypes of Streptococcus pneumoniae infection in our area.
Methods:
Over a period of two years (May 1997-May 1999), Streptococcus pneumoniae strains were isolated in the Clinical Microbiology Unit of the University Hospital Virgen de la Victoria in Málaga, Spain. This is a 750-bed hospital covering a population of 407,480 inhabitants, and admitting 21,500 hospitalized patients per year. Streptococcus was identified by standard procedures: serotyping was done with the Quellung test and antibiotic susceptibility study by the disk diffusion method and E-test.
Results:
Streptococcus pneumoniae infection was diagnosed in 170 patients during the years studied. The microorganism was isolated from samples of sputum (82), blood (43), aspirated bronchial fluid, cerebrospinal fluid (6), and exudates (7). Non-hospital origin was identified in 88% of cases. The mean hospital stay was 12 days and mortality was 12.4%. Some 45.9% of the isolated strains were resistant to penicillin and 20% to cefotaxime. We found 31 different serotypes, with 77% of the isolated strains belonging to 12 serotypes. Serotypes 19, 3 and 6B were the most frequent in non-hospital infection, whereas 9V and 23F were related with nosocomial infection. Penicillin-resistant strains of Streptococcus pneumoniae belonged to 19 different serotypes; 6B, 9V, 14, 19 and 23F were the most important.
Conclusions:
As was expected, Streptococcus pneumoniae infections of mainly non-hospital origin in our area were characterized by elevated mortality and high-level resistance to penicillin. Immunosuppression was a predisposing factor.
Insights
Streptococcus pneumoniae infections, primarily non-hospital acquired, show high mortality and significant penicillin resistance. Key serotypes like 19, 3, and 6B are most frequent, with resistance linked to specific serotypes.
Area of Science:
- Clinical Microbiology
- Infectious Diseases
- Epidemiology
Context:
- Streptococcus pneumoniae is a leading cause of pneumonia, meningitis, and sinusitis.
- Penicillin resistance in pneumococci is a growing global concern.
- This study investigates pneumococcal infections in Málaga, Spain.
Purpose:
- To determine the epidemiology of Streptococcus pneumoniae infections.
- To analyze antibiotic resistance patterns, particularly to penicillin.
- To identify prevalent serotypes and their association with resistance.
Summary:
- Over two years, 170 cases of Streptococcus pneumoniae infection were identified, predominantly non-hospital acquired (88%).
- Mortality was 12.4%, with 45.9% of strains resistant to penicillin and 20% to cefotaxime.
- Thirty-one serotypes were found; serotypes 19, 3, and 6B were most common in non-hospital infections, while 9V and 23F were linked to nosocomial infections. Penicillin resistance was associated with serotypes 6B, 9V, 14, 19, and 23F.
Impact:
- Highlights the significant burden of non-hospital acquired pneumococcal infections.
- Underscores the challenge of penicillin-resistant Streptococcus pneumoniae.
- Informs local public health strategies and antibiotic stewardship.
More Related Videos
Related Concept Videos
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...
Pneumonia I: Introduction
Atypical Pneumonia
Bacterial Meningitis II: Pathophysiology
Sputum Studies II: Culture and Sensitivity
Sputum culture and sensitivity is a medical procedure used to diagnose bacterial infections in the respiratory tract and select the most appropriate antibiotics for treatment. This process involves analyzing sputum samples of thick and opaque secretions produced in the lungs and airways. These samples are collected from patients and then sent to the laboratory for analysis.
The test can identify various pathogens responsible for respiratory infections, including Streptococcus,...
Pneumonia III: Complications and Assessment

