Objectives: Describe the distribution characteristics and antibiotic susceptibility of the Streptococcus spp. strains isolated from patients at Military Hospital 103 from January to December 2025.
Subjects and Methods: This is a cross-sectional descriptive study conducted on strains of Streptococcus spp. isolated from patients at Military Hospital 103.
Results: A total of 66 strains of pathogenic Streptococcus spp. were isolated from patients at Military Hospital 103 in 2025. Streptococcus agalactiae (31.8%), Streptococcus pneumoniae (15.2%), and Streptococcus anginosus (9.1%) were the three species with the highest proportion. Streptococcus spp. was isolated primarily from patients aged 40 years or older (89.4%) and from surgical departments (39.4%). Isolation rates of Streptococcus spp. were most prevalent in blood, urine, and body fluid samples, ranging from 22.7-25.8%. Streptococcus spp. showed the highest resistance rates to Erythromycin (75.6%), Clindamycin (73.4%), and Tetracycline (72.6%). Conversely, these bacteria were completely susceptible to Tigecyclin, Linezolid, and Vancomycin. Furthermore, strains isolated from non-sterile fluids had higher antibiotic resistance rates than strains isolated from sterile fluids.
Conclusions: Streptococcus spp. primarily causes disease in patients ≥ 40 years of age, including: S.agalactiae, S.pneumoniae, and S. anginosus. These are the streptococcal species that were isolated at the highest rates. Streptococcus spp. has the highest resistance rates to Erythromycin, Clindamycin, and Tetracycline. However, this bacterium remains completely susceptible to Tigecyclin, Linezolid, and Vancomycin.