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Table 2

Occurrences of Bithynia siamensis siamensis and Opisthorchis viverrini s.l., and prevalences of O. viverrini s.l. infection in each sampling locality in the Bangkok Metropolitan Region, Thailand.

Province District/Area Latitude Longitude B. s. siamensis
O. viverrini s.l.
Detected frequency (Total n = 7) Total no. of snails encountered Total no. of infected snails Detected frequency (Total n = 7) Prevalence at detected time Total prevalence
BK North Thonburi 13°45′21.2″ N 100°25′34.0″ E 6 62 0 0 0 0
BK South Thonburi 13°39′46.7″ N 100°23′55.8″ E 1 4 0 0 0 0
*BK South Bangkok 13°42′13.7″ N 100°39′03.0″ E 0 0 0 0 0 0
*BK Central Bangkok 13°45′33.2″ N 100°39′19.4″ E 0 0 0 0 0 0
BK East Bangkok 13°50′31.7″ N 100°49′43.6″ E 7 347 0 0 0 0
**BK North Bangkok 13°50′52.0″ N 100°34′21.5″ E 7 455 1 1 1.16 0.22
NP Bang Len 14°01′38.4″ N 100°10′45.7″ E 7 51 0 0 0 0
NP Kamphaeng Saen 13°59′33.1″ N 99°56′37.4″ E 1 1 0 0 0 0
NP Don Tum 13°56′53.8″ N 100°06′51.3″ E 7 309 0 0 0 0
**NP MuangNP 13°50′30.1″ N 100°02′04.9″ E 6 469 1 1 2.17 0.21
NP Nakhon Chai Sri 13°46′09.7″ N 100°07′49.0″ E 7 331 0 0 0 0
NP Sam Phran 13°45′29.8″ N 100°14′56.4″ E 7 230 0 0 0 0
NP Phutthamonthon 13°50′47.9″ N 100°17′14.6″ E 6 300 0 0 0 0
*NB Pak Kret 13°55′29.2″ N 100°28′49.1″ E 0 0 0 0 0 0
NB Bang Bua Thong 13°56′05.6″ N 100°22′46.4″ E 6 169 0 0 0 0
NB Sai Noi 14°01′30.6″ N 100°18′02.8″ E 7 568 0 0 0 0
NB Bang Yai 13°51′05.1″ N 100°22′23.3″ E 7 722 0 0 0 0
NB MuangNB 13°50′44.8″ N 100°27′56.9″ E 1 1 0 0 0 0
NB Bang Kruai 13°48′24.6″ N 100°23′11.9″ E 5 44 0 0 0 0
SS Krathum Baen 13°39′27.9″ N 100°12′46.8″ E 7 253 1 1 4.55 0.40
SS Ban Phaew 13°35′14.3″ N 100°07′01.4″ E 6 233 0 0 0 0
SS MuangSS 13°32′52.0″ N 100°12′42.4″ E 1 1 0 0 0 0
*SP Phra Samut Chedi 13°35′50.8″ N 100°30′23.7″ E 0 0 0 0 0 0
SP Phra Pradaeng 13°40′44.5″ N 100°34′38.0″ E 1 1 0 0 0 0
*SP MuangSP 13°35′35.1″ N 100°36′38.3″ E 0 0 0 0 0 0
SP Bang Phli 13°36′03.6″ N 100°44′46.0″ E 4 11 0 0 0 0
SP Bang Sao Thong 13°36′58.0″ N 100°47′51.7″ E 7 156 0 0 0 0
SP Bang Bo 13°35′27.1″ N 100°51′26.5″ E 5 112 0 0 0 0
**PT Lam Luk Ka 13°56′29.0″ N 100°46′30.1″ E 7 614 1 1 0.85 0.16
PT Thanyaburi 14°01′58.8″ N 100°45′21.7″ E 7 391 0 0 0 0
PT Nong Sua 14°08′12.1″ N 100°50′45.0″ E 6 198 0 0 0 0
PT Khlong Luang 14°05′32.9″ N 100°41′12.7″ E 7 1196 0 0 0 0
PT Sam Khok 14°04′44.4″ N 100°29′37.8″ E 2 4 0 0 0 0
PT Lat Lum Kaew 14°03′07.9″ N 100°24′24.1″ E 7 238 0 0 0 0
PT MuangPT 13°58′01.6″ N 100°33′02.4″ E 1 2 0 0 0 0
Overall total 156 7473 4 4 1.47 0.05

Rows with one asterisk (*) and two asterisks (**) at the header row represent a sampling locality without B. s. siamensis distribution and a sampling locality with detected O. viverrini s.l. infection, respectively. Abbreviations: BK = Bangkok, NP = Nakhon Pathom, NB = Nonthaburi, SS = Samut Sakhon, SP = Samut Prakan, PT = Pathum Thani.

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