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Identification of bacteria associated with canine otitis externa based on 16S rDNA high-throughput sequencing

  • Veterinary Microbiology - Research Paper
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Abstract

Bacteria are regarded as predisposing and perpetuating factors causing otitis externa (OE), whereas auricular anatomy is a predisposing factor. This study aims to investigate bacterial populations in the external auditory canals of healthy dogs and dogs with OE. Four categories of ear swabs included healthy erect-ear dogs, erect-ear dogs with OE, healthy pendulous-ear dogs and pendulous-ear dogs with OE. After bacterial DNA extraction, 16S rDNAs were amplified using specific primers within a V3/V4 region. Following DNA library construction, high-throughput sequencing was performed on MiSeq (Illumina). CLC Microbial Genomics Module was used to determine the rarefaction curve, bacterial classification, relative abundance, richness and diversity index. The results demonstrated that healthy dogs had higher bacterial richness and diversity than the dogs with OE. Comparable with culture-dependent methods described previously, this study revealed predominant Corynebacterium spp., Pseudomonas spp., Staphylococcus spp., and Proteus spp. in OE cases. Furthermore, high-throughput sequencing might disclose some potential emerging pathogens including Tissierella spp., Acinetobacter spp., and Achromobacter spp., which have not been reported in previous canine OE cases. Nevertheless, larger sample sizes are further required for an extensive evidence-based investigation.

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Acknowledgments

The authors would like to acknowledge Dr. Puntita Suksamai and the hospital staff for assistance in sample collection. Moreover, we are particularly grateful to Mr. Vorthon Sawaswong for the data analysis.

Funding

This research was funded by the Thailand Science Research and Innovation Fund (TSRI) (Grant Number CU_FRB65_hea (27)_034_30_15). Besides, Suthat Saengchoowong is grateful to his doctoral funding through Graduate School and Faculty of Medicine, Chulalongkorn University (the 100th Anniversary Chulalongkorn University Fund for Doctoral Scholarship; the 90th Anniversary of Chulalongkorn University Ratchadaphiseksomphot Endowment Fund; and the Overseas Research Experience Scholarship for Graduate Students of Chulalongkorn University).

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Authors and Affiliations

  1. Princess Srisavangavadhana College of Medicine, Chulabhorn Royal Academy, Bangkok, 10210, Thailand

    Suthat Saengchoowong

  2. Division of Biochemistry, Department of Preclinical Science, Faculty of Medicine, Thammasat University, Pathum Thani, 10120, Thailand

    Rungrat Jitvaropas

  3. Research Affairs, Faculty of Medicine, Chulalongkorn University, Bangkok, 10330, Thailand

    Witthaya Poomipak

  4. Department of Biochemistry, Faculty of Medicine, Chulalongkorn University, Bangkok, 10330, Thailand

    Kesmanee Praianantathavorn & Sunchai Payungporn

  5. Center of Excellence in Systems Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, 10330, Thailand

    Sunchai Payungporn

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  1. Suthat Saengchoowong
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Correspondence to Sunchai Payungporn.

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This research was done with the approval of the Chulalongkorn University Animal Care and Use Committee (Animal Use Protocol No. 1775005).

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Saengchoowong, S., Jitvaropas, R., Poomipak, W. et al. Identification of bacteria associated with canine otitis externa based on 16S rDNA high-throughput sequencing. Braz J Microbiol 54, 3283–3290 (2023). https://doi.org/10.1007/s42770-023-01166-0

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