SARS-CoV-2 does not have a strong effect on the nasopharyngeal microbial composition

Area of Science:

• Microbiology
• Virology
• Human Microbiome

Background:

• The human microbiome plays a crucial role in health and disease.
• Viral infections can impact the composition of the respiratory tract microbiome.
• Understanding these interactions is vital for managing infectious diseases like COVID-19.

Purpose of the Study:

• To investigate the relationship between SARS-CoV-2 infection and the nasopharyngeal microbiome.
• To determine if SARS-CoV-2 influences the microbial community in the upper respiratory tract.

Main Methods:

• Nasopharyngeal swab samples were collected from individuals suspected of SARS-CoV-2 infection.
• Microbial composition was analyzed using 16S amplicon sequencing.
• Data from 55 samples across 33 subjects, including longitudinal samples, were analyzed.

Main Results:

• Inter-personal variation was the primary factor (over 75%) influencing nasopharyngeal microbial composition.
• No significant impact of SARS-CoV-2 status on the nasopharyngeal microbial community was detected.
• This contrasts with other viruses known to alter the microbiome.

Conclusions:

• SARS-CoV-2 does not appear to strongly affect the nasopharyngeal microbiome.
• Microbial composition in the nasopharynx is largely driven by individual host factors rather than SARS-CoV-2 infection.
• Further research may explore mechanisms behind this lack of viral influence.