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Fig. 1.

Map showing the area of sample collection in two provinces in the northeastern region of Thailand, consisting of Nongkhai (NK) and Maha Sarakham (MK)
Map showing the area of sample collection in two provinces in the northeastern region of Thailand, consisting of Nongkhai (NK) and Maha Sarakham (MK)

Fig. 2.

Plasmodium spp. infections in erythrocytes of backyard ducks, turkeys and geese (indicated by arrows). (A) Plasmodium sp.; (B) Plasmodium gallinaceum; (C) Plasmodium gallinaceum; (D) Plasmodium juxtanucleare. Parasite species were identified by DNA sequencing
Plasmodium spp. infections in erythrocytes of backyard ducks, turkeys and geese (indicated by arrows). (A) Plasmodium sp.; (B) Plasmodium gallinaceum; (C) Plasmodium gallinaceum; (D) Plasmodium juxtanucleare. Parasite species were identified by DNA sequencing

Fig. 3.

Phylogenetic tree based on partial cytochrome b gene sequences of Plasmodium in this study (indicated in bold typeface) together with 33 related sequences from different distributions in Thailand and neighbouring countries in the GenBank and MalAvi databases. Sequences were compared with the maximum likelihood method. The cytochrome b gene of two Haemoproteus sp. was used as the outgroup. The percentage of trees in which associated taxa clustered together is shown next to the branch
Phylogenetic tree based on partial cytochrome b gene sequences of Plasmodium in this study (indicated in bold typeface) together with 33 related sequences from different distributions in Thailand and neighbouring countries in the GenBank and MalAvi databases. Sequences were compared with the maximum likelihood method. The cytochrome b gene of two Haemoproteus sp. was used as the outgroup. The percentage of trees in which associated taxa clustered together is shown next to the branch

Lineages of 37 cytochrome b gene sequences from backyard poultry in Thailand with matches to MalAvi database and National Center for Biotechnology Information (NCBI) GenBank database sequences

Lineage names Parasites Sample IDs NCBI GenBank accession No. Closest sequences in NCBI GenBank (% similarity)
ACCBAD01 Plasmodium sp. D3, D5, D11, D34, D38, D42, D43, D51, D53, T4, T6, T13, T15, T26, T34, T17 OR341180 MK390829.1 (100%), JN639001.1 (100%)
ORW1 Plasmodium sp. D36, T11, T12, T14, T16, T18, T21, T22, T25, T27, T29, T31, T30, T32 OR341179 EF552403.1 (100%), KJ145050.1 (100%), KJ396632.1 (100%)
FANTAIL01 Plasmodium sp. G5 OR341184 AY714196.1 (100%), HF543648.1 (100%)
ANAPLA Plasmodium sp. D1 OR341178 MK390829.1 (99.78%), JN639001.1 (99.78%)
GALLUS01 P. gallinaceum T2, T7 OR341181 LC506179.1 (96.63-100%), LN835294.1 (96.63-100%)
MELGAL P. gallinaceum T20, T28 OR341183 LC506179.1 (99.77%), LN835294.1 (99.77%)
GALLUS02 P. juxtanucleare T9 OR341182 KU248845.1 (99.56%), KT290918.1 (99.56%)

Prevalence of Plasmodium spp. infections in backyard poultry

Locations (Provinces) Host Prevalence of Plasmodium spp. Plasmodium species (n)
Common name Scientific name Microscopic examination (%) PCR examination (%)
Nongkhai Domestic duck Anas platyrhynchos domesticus 1/30 (3.3) 4/30 (13.3) Plasmodium sp. (4) Plasmodium sp. (2)
Domestic turkey Meleagris gallopavo 1/10 (10) 5/10 (50) P. juxtanucleare (1)P. gallinaceum (2)
Maha Sarakham Swan goose Anser cygnoides 0/11 (0) 1/11 (9.1) Plasmodium sp. (1)
Domestic duck Anas platyrhynchos domesticus 2/30 (6.7) 7/30 (23.3) Plasmodium sp. (7)
Domestic turkey Meleagris gallopavo 7/26 (26.9) 20/26 (76.9) Plasmodium sp. (18)P. gallinaceum (2)
Swan goose Anser cygnoides 0/9 (0) 0/9 (0) -
Total 11/116 (9.5) 37/116 (31.9)

Association among Plasmodium spp. infections with PCV levels

Host Parasites Levels of PCV (%) (mean ± SD) 95% CI of average PCV value (%) P-value Normal range (24)
Common name Scientific name Plasmodium spp. infections
Duck Anas platyrhynchos domesticus infected (n = 11) 34.91 ± 4.87 31.64-38.18 0.62 36-58%
uninfected (n = 49) 33.83 ± 6.68 31.89-35.77
Turkey Meleagris gallopavo infected (n = 25) 38.92 ± 5.50 36.59-41.24 0.07 36-41%
uninfected (n = 11) 35.09 ± 5.82 31.18-39.00
Geese Anser cygnoides infected (n = 1) 47.00 N/A N/A 38-58%
uninfected (n = 19) 41.10 ± 3.03 38.93-43.27
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