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. 2024 Sep:146:107133.
doi: 10.1016/j.ijid.2024.107133. Epub 2024 Jun 13.

Coxsackievirus A24 causing acute conjunctivitis in a 2023 outbreak in Vietnam

Collaborators, Affiliations

Coxsackievirus A24 causing acute conjunctivitis in a 2023 outbreak in Vietnam

Huy Tran et al. Int J Infect Dis. 2024 Sep.

Abstract

Objectives: To determine the associated pathogen during the 2023 conjunctivitis outbreak in Vietnam METHODS: RNA-sequencing was used to identify pathogens before and during the outbreak.

Results: 24 patients with infectious conjunctivitis between March and October 2023 from Hai Yen Vision Institute in Vietnam were swabbed. Coxsackievirus A24v was the most common pathogen identified. Phylogenetic analysis of these strains demonstrates similarities to the Coxsackievirus identified in the 2022 India outbreak. Human adenovirus D was also circulating. Ocular findings of tearing, purulence, and itching were common in this outbreak.

Conclusions: Multiple viruses can co-circulate during conjunctivitis outbreaks. Hemorrhagic conjunctivitis, commonly associated with coxsackievirus conjunctivitis, was not a common clinical sign in this outbreak. Repeat genetic surveillance, with the notable inclusion of RNA virus detection strategies, is important for outbreak detection.

Keywords: Conjunctivitis; Coxsackievirus; Epidemic; Keratoconjunctivitis (EKC); Vietnam.

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Conflict of interest statement

Declarations of competing interest The authors have no relevant financial or non-financial competing interests to report.

Figures

Figure 1.
Figure 1.
(a) Pathogens identified by RNA-sequence analysis during the 2023 conjunctivitis outbreak in Vietnam (n=24). (b) Maximum-likelihood phylogenetic tree based on the genome sequences of CV-A24v isolated from 5 patients from the outbreak in Ho Chi Minh City in 2023 and prior outbreaks, including a prior outbreak in India in 2022 also captured by our study. The coverage of the genomes for this outbreak ranged from 82% to 91%.

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