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Table 1 Mortality, number of birds infected, 50% bird infectious doses, and seroconversion of 2-week-old Pekin ducks and Chinese geese inoculated by the intrachoanal route and contact-exposed to A/gyrfalcon/WA/40188-6/2014 (H5N8) and A/Northern pintail/WA/40964/2014 (H5N2) HPAI viruses

From: Infectivity, transmission and pathogenicity of H5 highly pathogenic avian influenza clade 2.3.4.4 (H5N8 and H5N2) United States index viruses in Pekin ducks and Chinese geese

Species Virus Inoculated birds Contact-exposed birds
Virus dose (log10 EID50) # of infected birds/totala BID b50 (log10 EID50) Mortalityc (dpid) Serologyd (range of antibody titers, log2) # of infected birds/total Mortality (dpee) Serology (range of antibody titers, log2)
Pekin ducks H5N8 2 0/5 3.0 0/5 0/5 0/3 0/3 0/3
4 5/5 0/5 5/5 (4–5) 1/3 0/3 1/3 (4)
6 5/5 0/5 5/5 (4–5) 2/3 0/3 2/3 (4)
H5N2 2 0/5 3.0 0/5 0/5 0/3 0/3 0/3
4 5/5 0/5 5/5 (3) 2/3 0/3 1/3 (3)
6 4/4 0/4 4/4 (3–4) 3/3 0/3 3/3 (3–5)
Chinese geese H5N8 2 4/4 < 2 0/4 1/4 (4) 2/2 0/2 0/2
4 4/4 0/4 0/4 2/2 0/2 1/2 (3)
6 4/4 0/4 2/4 (3) 2/2 1/2 (11) 0/2
H5N2 2 0/4 3.0 0/4 0/4 0/2 0/2 0/4
4 4/4 0/4 1/4 (3) 2/2 1/2 (10) 0/1
6 4/4 1/4 (8) 1/3 (3) 2/2 0/2 0/2
  1. aNumber of birds infected/total number of birds inoculated; determined by qRRT-PCR and serology.
  2. bBID50, mean bird infectious dose.
  3. cNumber of dead birds/total number of birds inoculated (days post-inoculation).
  4. dNumber of birds with positive antibody titers/total number of birds inoculated.
  5. eDays post-exposure.