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. 2013 Nov;7(6):1122-7.
doi: 10.1111/irv.12145. Epub 2013 Aug 21.

The frequency and seasonality of influenza and other respiratory viruses in Tennessee: two influenza seasons of surveillance data, 2010-2012

Michelle B Landes  1 , R Brock Neil, Susan S McCool, Bryan P Mason, Amy M Woron, Robb L Garman, David L Smalley
Affiliations

The frequency and seasonality of influenza and other respiratory viruses in Tennessee: two influenza seasons of surveillance data, 2010-2012

Michelle B Landes et al. Influenza Other Respir Viruses. 2013 Nov.

Abstract

Background: In 2010, the Tennessee Department of Health, in collaboration with the Centers for Disease Control and Prevention (CDC), expanded influenza surveillance in Tennessee to include other respiratory viruses.

Objectives: To determine the prevalence and seasonality of influenza and other respiratory viruses during the influenza seasons of 2010-2012.

Methods: Nasal and nasopharangeal swabs/washings from persons with influenza-like illness were collected across Tennessee. Influenza and other respiratory viruses were identified using a molecular-based respiratory virus panel. Influenza A positives were subtyped using real-time PCR according to the CDC protocol. Data were analyzed to describe frequency and seasonality of circulating strains.

Results: Of the 933 positive specimens, 60·3% were identified as influenza viruses, 19·8% rhinovirus/enterovirus, 8·6% respiratory syncytial virus (RSV), 5·8% metapneumovirus, 3·0% adenovirus, and 2·5% parainfluenza viruses. In the 2010-2011 season, influenza B was prominent during weeks 48-3, while influenza A(H1N1) was most frequently identified during weeks 4-10. Influenza A(H3N2) was present at lower levels during weeks 48-17. However, in the 2011-2012 season, overall numbers of influenza cases were reduced and influenza A (H3N2) was the most abundant influenza strain. The expanded surveillance for other respiratory viruses noted an increase in identified specimens from the first to the second season for adenovirus, metapneumovirus, RSV, and rhinovirus/enterovirus.

Conclusions: This study provides data of the influenza strains in circulation in Tennessee. It also establishes a baseline and time of year to expect other respiratory viruses that will aid in detecting outbreaks of non-influenza respiratory viruses in Tennessee.

Keywords: Adenovirus; Tennessee; influenza; respiratory syncytial virus; rhinovirus; surveillance.

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Figures

Figure 1
Figure 1
(A) Percent of specimens identified each week as positive for a respiratory virus during the 2010–2011 and 2011–2012 influenza seasons. (B) Percent breakdown of each respiratory virus type detected in Tennessee over the 2‐year period 2010–2012 of all positive respiratory viral specimens submitted. (C) The average percentage of positive isolates per week for each respiratory virus over the 2010–2011 and 2011–2012 influenza seasons. A total of 1144 specimens were submitted in the 2010–2011 season and 803 in the 2011–2012 season.
Figure 2
Figure 2
(A) Percent of submitted specimens identified each weeks as positive for influenza [A(H1N1)pdm09, A(H3N2), influenza B] during each week of the 2010–2011 influenza season. (B) Percent of submitted specimens positive for influenza during each week of the 2011–2012 influenza season. A total of 1144 specimens were submitted in the 2010–2011 season and 803 in the 2011–2012 season.
Figure 3
Figure 3
Percent of submitted specimens identified each week as positive during the 2010–2011 and 2011–2012 influenza seasons. A total of 1144 specimens were submitted in the 2010–2011 season and 803 in the 2011–2012 season. (A) RSV‐A and RSV‐B, RSV, respiratory syncytial virus; (B) metapneumovirus and adenovirus (C) parainfluenza A, B, and C, and (D) rhinovirus/enterovirus.
See this image and copyright information in PMC

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