Volume 23, Number 11—November 2017
Dispatch
Highly Pathogenic Avian Influenza A(H7N9) Virus, Tennessee, USA, March 2017
Dong-Hun Lee, Mia K. Torchetti, Mary Lea Killian, Yohannes Berhane, and David E. Swayne
Table
Times to most recent common ancestors of H7N9 viruses, Tennessee and Alabama, USA, March 2017*
| Virus clusters (no. taxa)† | tMRCA‡ | BCI 95% | Posterior probability |
|---|---|---|---|
| Tennessee and Alabama LPAI and HPAI viruses (22) | 2016 Oct 5 | 2016 Aug 8–2016 Dec 10 | 1.00 |
| Tennessee LPAI and HPAI viruses (15) | 2016 Dec 21 | 2016 Nov 7–2017 Feb 3 | 1.00 |
| Tennessee LPAI virus (3) | 2017 Jan 23 | 2016 Dec 3–2017 Feb 25 | 0.98 |
| Tennessee HPAI virus (12) | 2017 Jan 30 | 2017 Jan 1–2017 Feb 25 | 1.00 |
| Alabama LPAI virus from backyard guinea fowl (3) | 2017 Jan 8 | 2016 Nov 18–2017 Feb 21 | 1.00 |
| Alabama LPAI virus from commercial chicken (3) | 2017 Jan 26 | 2016 Dec 10–2017 Mar 8 | 1.00 |
*BCI, Bayesian credible interval; HPAI, highly pathogenic avian influenza; LPAI, low pathogenicity avian influenza; tMRCA, time to most recent common ancestor.
†See online Technical Appendix Table (https://wwwnc.cdc.gov/EID/article/23/11/17-1013-Techapp1.pdf) for specific virus strains used in analysis.
‡Times to most recent common ancestors of hemagglutinin segment.
Page created: October 17, 2017
Page updated: October 17, 2017
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