Identification of Pathogenic Bacteria from Public Libraries via Proteomics Analysis

Area of Science:

• Environmental microbiology
• Public health
• Proteomics

Background:

• Surfaces with frequent human contact, such as children's library books, can harbor hazardous microorganisms.
• Understanding the microbial contamination of shared resources is crucial for public health assessments.

Purpose of the Study:

• To investigate the presence and types of bacteria on children's library books.
• To assess bacterial resistance to common antibiotics using proteomic identification.
• To evaluate the public health implications of microbial contamination on library books.

Main Methods:

• Swab samples collected from 42 children's books across four libraries in Texas and California.
• Bacterial cultivation in brain-heart infusion (BHI) and Luria broth (LB) media, with and without ampicillin or kanamycin.
• Bacterial species identification using Orbitrap Fusion™ Tribrid™ mass spectrometry for proteomic analysis.

Main Results:

• 100% of samples showed bacterial growth in BHI medium.
• 83.3% and 47.6% of samples showed growth in LB medium with ampicillin and kanamycin, respectively.
• Identified bacteria included pathogenic species such as *Bacillus*, *Acinetobacter*, *Pseudomonas*, *Staphylococcus*, *Enterobacter*, *Klebsiella*, *Serratia*, *Streptococcus*, *Escherichia*, *Salmonella*, and *Enterococcus*.

Conclusions:

• Children's library books are reservoirs for diverse bacterial communities, including antibiotic-resistant and pathogenic species.
• Proteomics is an effective tool for identifying environmental pathogens and assessing public health risks.
• Further research is warranted to determine the specific health risks associated with bacteria found on library books.