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Volume 26, Number 12—December 2020
Research

Equine-Like H3 Avian Influenza Viruses in Wild Birds, Chile

Nicolas Bravo-Vasquez1, Jiangwei Yao1, Pedro Jimenez-Bluhm1Comments to Author , Victoria Meliopoulos, Pamela Freiden, Bridgett Sharp, Leonardo Estrada, Amy Davis, Sean Cherry, Brandi Livingston, Angela Danner, Stacey Schultz-Cherry, and Christopher Hamilton-WestComments to Author 
Author affiliations: University of Texas Health Science Center, Houston, Texas, USA (N. Bravo-Vasquez); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (J. Yao); University of Chile, Santiago, Chile (P. Jimenez-Bluhm, C. Hamilton-West); St. Jude Children’s Research Hospital, Memphis, Tennessee, USA (V. Meliopoulos, P. Freiden, B. Sharp, L. Estrada, A. Davis, S. Cherry, B. Livingston, A. Danner, S. Schultz-Cherry)

Main Article

Table 3

Infection and transmission in chickens of equine-like H3 avian influenza viruses in wild birds, Chile*

Bird, virus subtype Type of infection 3 dpi
 5 dpi
 7 dpi
 9 dpi
 12 dpi
 HI titer, 21 dpi
OP CL OP CL OP CL OP CL OP CL
PBS, n = 6
 C
 0/6
 0/6
0/6
 0/6
0/6
 0/6
0/6
 0/6
0/6
 0/6
 0/6
eq/Miami/1963, H3N8
 I 0/3 0/3 0/3 0/3 0/3 0/3 0/3 0/3 0/3 0/3 0/3
DC
 0/9
 0/9
0/9
 0/9
0/9
 0/9
0/9
 0/9
0/9
 0/9
 0/9
eq/NY/2016, H3N8
 I 0/3 0/3 0/3 0/3 0/3 0/3 0/3 0/3 0/3 0/3 1/3 (160)
DC
 0/9
 0/9
0/9
 0/9
0/9
 0/9
0/9
 0/9
0/9
 0/9
 0/9
Red-fronted coot, H3N6
 I 3/3 
(2.75–
5.5) 1/3 (8.25) 2/3 
(2.25–4.25) 0/3 0/3 0/3 0/3 0/3 0/3 0/3 2/3 
(20–80)
DC
 4/9 
(3.25–4.5)
 0/9
5/9 
(2.75–5.75)
 1/9 (7.75)
3/9 (2.5–5.5)
 1/9 (8.5)
2/9 
(2.25–4.75)
 1/9 (2.75)
0/9
 1/9 (2)
 2/9 
(20)
Yellow-billed pintail, H3N8
 I 3/3 
(2.5–5.5) 0/3 1/3 
(3.25) 0/3 0/3 0/3 0/3 0/3 0/3 0/3 2/3 
(40–80)
DC
 3/9 
(3.5–5.5)
 1/9 (5.5)
3/9 
(2.75–5.5)
 1/9 (6.5)
1/9 (5)
 1/9 (5.25)
0/9
 1/9 (2.75)
0/9
 0/9
 1/9 
(40)
Red-gartered coot, H3N4 I 3/3 
(2.25) 0/3 1/3 
(2.25) 1/3 (5.5) 0/3 1/3 (5.5) 0/3 1/3 (3.75) 0/3 1/3 (3.25) 2/3 
(20–40)
DC 5/9 
(2.25–4) 1/9 (2.25) 4/9 
(3–5.5) 0/9 2/9 (3.75–4) 0/9 0/9 0/9 0/9 0/9 4/9 
(20–40)

*Values are no. birds infected/total number in group. Values in parentheses are ranges of viral titers (log 50% median tissue culture infectious dose) per timepoint and group. C, control; CL, cloacal; DC, direct contact; dpi, days postinfection; H, hemagglutinin; HI, hemagglutinin inhibition; I, inoculates; N, neuraminidase; OP, oropharyngeal; PBS, phosphate-buffered saline.

Main Article

1These authors contributed equally to this article.

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Page updated: November 19, 2020
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