Volume 26, Number 12—December 2020
Research
Equine-Like H3 Avian Influenza Viruses in Wild Birds, Chile
Nicolas Bravo-Vasquez1, Jiangwei Yao1, Pedro Jimenez-Bluhm1
, Victoria Meliopoulos, Pamela Freiden, Bridgett Sharp, Leonardo Estrada, Amy Davis, Sean Cherry, Brandi Livingston, Angela Danner, Stacey Schultz-Cherry, and Christopher Hamilton-West
, Victoria Meliopoulos, Pamela Freiden, Bridgett Sharp, Leonardo Estrada, Amy Davis, Sean Cherry, Brandi Livingston, Angela Danner, Stacey Schultz-Cherry, and Christopher Hamilton-West
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.
1These authors contributed equally to this article.
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