Key result
An upsurge of EV-D68 infections occurred among acute respiratory tract infection cases in Beijing in 2016 (0.53% detection rate), driven by the co-circulation of subclade B3 and a newly emerged subclade D3.
Why the study?
Surveillance was conducted to define the epidemiology, clinical characteristics, and genetic variations of EV-D68 among acute respiratory tract infection cases in Beijing, China from 2015 to 2017.
Observational (n=21,816)
Yes
An upsurge of EV-D68 occurred in Beijing in 2016, driven by the emergence of a new subclade D3 co-circulating with subclade B3.
EV-D68 surveillance data in Beijing ARTI may guide local monitoring; leaves open clinical impact and need for prospective studies.
We conducted a surveillance among acute respiratory tract infection (ARTI) cases to define the epidemiology, clinical characteristics and genetic variations of enterovirus D68 (EV-D68) in Beijing, China from 2015 to 2017. Nasopharyngeal swabs and sputum were collected from 30 sentinel hospitals in Beijing and subjected to EV and EV-D68 detection by real-time PCR. The VP1 gene region and complete genome sequences of EV-D68 positive cases were analyzed. Of 21816 ARTI cases, 619 (2.84%) were EV positive and 42 cases were EV-D68 positive. The detection rates of EV-D68 were 0 (0/6644) in 2015, 0.53% (40/7522) in 2016 and 0.03% (2/7650) in 2017, respectively. Two peaks of EV-D68 infections occurred in late summer and early-winter. Ten cases (23.81%) with upper respiratory tract infection and 32 cases (76.19%) presented with pneumonia, including 3 cases with severe pneumonia. The phylogenetic analysis suggested 15 subclade D3 strains and 27 subclade B3 strains of EV-D68 were circulated in China from 2016 to 2017. A total of 52 amino acid polymorphisms were identified between subclades D1 and D3. These data suggest an upsurge of EV-D68 occurred in Beijing in 2016, the new subclade D3 emerged in 2016 and co-circulated with subclade B3 between 2016 and 2017.
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Shen et al. (2019) conducted an observational in Acute respiratory tract infection (n=21,816). Enterovirus D68 (EV-D68) was evaluated on EV-D68 detection rate. An upsurge of EV-D68 infections occurred among acute respiratory tract infection cases in Beijing in 2016 (0.53% detection rate), driven by the co-circulation of subclade B3 and a newly emerged subclade D3.
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