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J Infect Dis. 2015 Sep 15;212(6):871-80. doi: 10.1093/infdis/jiv141. Epub 2015 Mar 6.

Molecular Epidemiology of Adenovirus Type 21 Respiratory Strains Isolated From US Military Trainees (1996-2014).

Author information

1
Lovelace Respiratory Research Institute, Albuquerque, New Mexico.
2
Viral Diseases Branch, Walter Reed Army Institute of Research, Silver Spring, Maryland.
3
Operational Infectious Diseases Department, Naval Health Research Center, San Diego, California.
4
Institute of Virology, Hannover Medical School, Germany.
5
Armed Forces Health Surveillance Center, Silver Spring, Maryland.

Abstract

BACKGROUND:

The circulation of human adenovirus type 21 (HAdV21) in the United States has been documented since the 1960s in association with outbreaks of febrile respiratory illness (FRI) in military boot camps and civilian cases of respiratory disease.

METHODS:

To describe the molecular epidemiology of HAdV21 respiratory infections across the country, 150 clinical respiratory isolates obtained from continuous surveillance of military recruit FRI, and 23 respiratory isolates recovered from pediatric and adult civilian cases of acute respiratory infection were characterized to compile molecular typing data spanning 37 years (1978-2014).

RESULTS:

Restriction enzyme analysis and genomic sequencing identified 2 clusters of closely related genomic variants readily distinguishable from the prototype and designated 21a-like and 21b-like. A-like variants predominated until 1999. A shift to b-like variants was noticeable by 2007 after a 7-year period (2000-2006) of cocirculation of the 2 genome types. US strains are phylogenetically more closely related to European and Asian strains isolated over the last 4 decades than to the Saudi Arabian prototype strain AV-1645 isolated in 1956.

CONCLUSIONS:

Knowledge of circulating HAdV21 variants and their epidemic behavior will be of significant value to local and global FRI surveillance efforts.

KEYWORDS:

DNA; adenovirus evolution; military; molecular epidemiology

PMID:
25748322
DOI:
10.1093/infdis/jiv141
[Indexed for MEDLINE]

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