The upper respiratory tract microbiome of indigenous Orang Asli in north-eastern Peninsular Malaysia

NPJ Biofilms Microbiomes. 2021 Jan 5;7(1):1. doi: 10.1038/s41522-020-00173-5.

Abstract

Much microbiome research has focused on populations that are predominantly of European descent, and from narrow demographics that do not capture the socio-economic and lifestyle differences which impact human health. Here we examined the airway microbiomes of the Orang Asli, the indigenous peoples of Malaysia. A total of 130 participants were recruited from two sites in the north-eastern state of Terengganu in Peninsular Malaysia. Using 16S rRNA sequencing, the nasal microbiome was significantly more diverse in those aged 5-17 years compared to 50+ years (p = 0.023) and clustered by age (PERMANOVA analysis of the Bray-Curtis distance, p = 0.001). Hierarchical clustering of Bray-Curtis dissimilarity scores revealed six microbiome clusters. The largest cluster (n = 28; 35.4%) had a marked abundance of Corynebacterium. In the oral microbiomes Streptococcus, Neisseria and Haemophilus were dominant. Using conventional microbiology, high levels of Staphylococcus aureus carriage were observed, particularly in the 18-65 age group (n = 17/36; 47.2% 95% CI: 30.9-63.5). The highest carriage of pneumococci was in the <5 and 5 to 17 year olds, with 57.1% (4/7) and 49.2% (30/61), respectively. Sixteen pneumococcal serotypes were identified, the most common being the nonvaccine-type 23A (14.6%) and the vaccine-type 6B (9.8%). The prevalence of pneumococcal serotypes covered by pneumococcal conjugate vaccines support introduction into a Malaysian national immunisation schedule. In addition, the dominance of Corynebacterium in the airway microbiomes is intriguing given their role as a potentially protective commensal with respect to acute infection and respiratory health.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Aged
  • Anti-Bacterial Agents / pharmacology
  • Bacteria / classification
  • Bacteria / drug effects
  • Bacteria / genetics
  • Bacteria / isolation & purification
  • Child
  • Child, Preschool
  • Cluster Analysis
  • Drug Resistance, Bacterial
  • Female
  • Humans
  • Indigenous Peoples / statistics & numerical data*
  • Malaysia
  • Male
  • Microbiota*
  • Middle Aged
  • Mouth / microbiology
  • Nasal Cavity / microbiology
  • Prevalence
  • RNA, Ribosomal, 16S / genetics
  • Respiratory System / microbiology*
  • Serogroup
  • Streptococcus pneumoniae / classification
  • Streptococcus pneumoniae / drug effects
  • Streptococcus pneumoniae / genetics
  • Streptococcus pneumoniae / isolation & purification
  • Young Adult

Substances

  • Anti-Bacterial Agents
  • RNA, Ribosomal, 16S