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Viral load of SARS-CoV-2 Omicron BA.5 is lower than that of BA.2 despite the higher infectivity of BA.5.

Immunity, inflammation and disease - 1 Feb 2023

Takatsuki Yuna, Takahashi Yuta, Nakajima Jun, Iwasaki Yumi, Nagano Katsutoshi, Tani-Sassa Chihiro, Yuasa Sonoka, Kanehira Saki, Sonobe Kazunari, Nukui Yoko, Takeuchi Hiroaki, Tanimoto Kousuke, Tanaka Yukie, Kimura Akinori, Ichimura Naoya, Tohda Shuji

Abstract excerpt

BACKGROUND: Sublineage BA.5 of the SARS-CoV-2 Omicron variant rapidly spread and replaced BA.2 in July 2022 in Tokyo. A high viral load can be a possible cause of high transmissibility. METHODS AND RESULTS: The copy numbers of SARS-CoV-2 in nasopharyngeal swab samples obtained from all patients visiting the hospital where this research was conducted were measured using reverse transcription-quantitative...

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PMID: 36840495
DOI: 10.1002/iid3.783
PMCID: PMC9933202

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PubMed metadata and Literature Corpus relationships. Corpus snapshot updated 7 Sept 2026. Manifest publication-graph-cohort-2026-09-08.1.

Source receipt: pubmed, retrieved 7 Sept 2026.

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