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Table 1 Mean body weight gain after the infective meal and the mean number of blood trypomastigotes ingested by the fifth-instar nymph pool of Rhodnius robustus and Rhodnius pictipes fed on Swiss mice previously infected with 1400 BT of pure inoculum or mixed inoculum

From: Infection susceptibility and vector competence of Rhodnius robustus Larrousse, 1927 and R. pictipes Stal, 1872 (Hemiptera, Reduviidae, Triatominae) for strains of Trypanosoma cruzi (Chagas, 1909) (Kinetoplastida, Trypanosomatidae) I, II and IV

Experimental groupa

Rhodnius robustus

Rhodnius pictipes

Mean weight gain ± SD (mg)

Mean number of BT ingested

Mean weight gain ± SD (mg)

Mean number of BT ingested

G1 (TcIAM)

1096 ± 693

76,720

476 ± 399

33,320

G2 (TcIMG)

992 ± 219

69,440

628 ± 272

43,960

G3 (TcII)

1014 ± 387

70,980

687 ± 653

48,090

G4 (TcIV)

275 ± 85

19,250

452 ± 288

31,640

G5 TcIAM+TcIV)

640 ± 1110

44,800

50 ± 10

3500

G6 (TcIAM+TcII)

388 ± 35

27,160

296 ± 86

20,720

G7 (TcIMG+TcIV)

403 ± 458

28,210

571 ± 220

39,970

G8 (TcIMG+TcII)

657 ± 295

45,990

535 ± 365

37,450

G9 (TcII+TcIV)

258 ± 400

18,060

246 ± 116

17,220

Mean ± SD

730 ± 165

44,512 ± 23,093

465 ± 36

30,652 ± 14,312

P value

0.007*

ns

0.007*

ns

  1. BT Blood trypomastigotes, G experimental groups, ns not significant, SD standard deviation, TcI, TcII, TcIV discrete typing units
  2. *The Wilcoxon test was used to compare differences in weight gain between experimental groups (G1–G9) after the infective meal, considering a significance level of 5%
  3. aExperimental groups consisted of mice infected with pure inoculum, consisting of a single strain of Trypanosoma cruzi (G1–G4), or with mixed inoculum, consisting of mixed strains of T. cruzi (G5–G9)