Volume 25, Number 10—October 2019
Dispatch
Antigenic Variation of Avian Influenza A(H5N6) Viruses, Guangdong Province, China, 2014–2018
Table
HI titers of influenza A(H5N6) virus strains collected during 2014–2018 in Guangdong Province, China, compared with vaccine strains*
Virus strain† | Sample type | Collection date | HI titers |
||||||
---|---|---|---|---|---|---|---|---|---|
Postvaccination chicken serum |
H5N6-infected human serum |
||||||||
S1 | S2 | S3 | S4 | S5 | S6 | ||||
39715 | Human | 2014 Dec 11 | 512 | 512 | 1024 | 512 | 256 | 16 | |
ZQ874 | Human | 2015 Dec 31 | 512 | 512 | 512 | 512 | 256 | 16 | |
HA256 | Human | 2017 Jun 30‡ | 256 | 256 | 512 | 256 | 256 | 64 | |
18SF020-1 | Human | 2018 Sep 30 | 32 | 16 | 64 | 32 | 16 | 64 | |
C17280709 | Environment | 2017 May 2 | 64 | 64 | 128 | 128 | 64 | 16 | |
C18277136 | Environment | 2018 Apr 2 | 64 | 32 | 32 | 64 | 16 | 16 | |
C18285099 | Environment | 2018 Feb 28 | 32 | 32 | NT | NT | 32 | 8 | |
PO17284158 | Waterfowl | 2018 May 10 | 128 | 64 | NT | NT | NT | NT | |
A§ | Chicken | 2018 Nov 19¶ | 2,048 | 1,024 | 4,096 | 1,024 | 1,024 | NT | |
B# | Chicken | 2018 Sep 20** | 32 | 32 | NT | NT | NT | NT |
*NT, not tested; S, sample no.
†The name of virus strain is the abbreviation of the original name for each viral isolate.
‡Date isolate received.
§Vaccine strain A/chicken/Guizhou/4/2013 (Re-8) + H7 A/pigeon/Shanghai/S1069/2013 (Re-1).
¶Date vaccine strain tested.
#Vaccine strain H5 A/duck/Guangdong/S1322/2010 (Re-6).
**Date vaccine strain received.
1These authors contributed equally to this article.