Structural and Population Polymorphism of RT-Like Sequences in Avian Schistosomes Trichobilharzia szidati (Platyhelminthes: Digenea: Schistosomatidae)

Table 1

General data for 6 cercarial isolates from L. stagnalis and L. palustris and for 40 sequences obtained by the primers TR98F and TR98R. Distribution of clones examined between three groups indicated in Figure 1 is shown in square brackets [I, II, III].

Isolate	Host	Locality	Total number of sequences		^**-distance (%), min–max (average)
			Cercariae	Sporocysts
Sz31	Ls	Belarus	2 2, 0, 0
				spc 1 1, 3, 3	0.3–21.1 (10.6)
Sz43	Lp	Belarus	2 1, 0, 1	spc 2 [ , 1, 6]	0–1.3 (0.5)
				Σ = 14 1, 4, 9	0–20.9 (6.5)
Sz11	Lp	Karelia	5 4, 0, 1	—	0.5–19.6 (8.6)
				spc 1 2, 1, 1	0–20.1 (13.7)
Sz12	Lp	Karelia	—	spc 2 [ , 1, 1]	0.3–19.9 (8.1)
				Σ = 10 6, 2, 2	0–20.5 (9.1)
Sz1	Ls	Moscow	2 1, 1, 0	—	—
Sz3^*	Ls	Moscow	5 0, 1, 4	—	0–0.3 (0.2)
Σ	Ls		9 3, 2, 4	—	0–18.3 (10.5)
	Lp		7 5, 0, 2	24 7, 6, 11	0–21.2 (11.3)
	Ls + Lp		16 8, 2, 6	24 7, 6, 11	0–45.9 (24.1)

^*This group includes three previously deposited sequences GU980751–GU980753. ^**The comparison was carried out only for 390 and 391 bp fragments; spc: sporocyst.