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Volume 17, Number 5—May 2011

Research

Experimental Infection of Amblyomma aureolatum Ticks with Rickettsia rickettsii

Marcelo B. LabrunaComments to Author , Maria Ogrzewalska, João F. Soares, Thiago F. Martins, Herbert S. Soares, Jonas Moraes-Filho, Fernanda A. Nieri-Bastos, Aliny P. Almeida, and Adriano Pinter
Author affiliations: Author affiliations: University of São Paulo, São Paulo, Brazil (M.B. Labruna, M. Ogrzewalska, J.F. Soares, T.F. Martins, H.S. Soares, J. Moraes-Filho, F.A. Nieri-Bastos, A.P. Almeida); Superintendency of Control of Endemic Diseases, São Paulo (A. Pinter)

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Table 2

Molting and oviposition success of Amblyomma aureolatum ticks infected by Rickettsia rickettsii (infected group) and noninfected (control group) through 4 consecutive generations (F1 to F4) in the laboratory*

Tick generation
No. larvae that molted to nymphs/
no. recovered engorged larvae
(% molting success)
No. nymphs that molted to adults/
no. recovered engorged nymphs
(% molting success)
No. females that oviposited/
no. recovered engorged females (% oviposition success)
Infected
Control
Infected
Control
Infected
Control
F1 632/679 (93.1) 226/250 (90.4) 68/71 (95.8) 25/29 (86.2) 12/16 (75) 13/13 (100)
F2 300/349 (86.0) 791/959 (82.5) 57/60 (95.0) 24/28 (85.7) 5/10 (50) 7/9 (77.8)
F3 292/443 (65.9) 737/1,179 (62.5) 49/110 (44.5) 51/68 (75.0)† 5/7 (71.4) 6/7 (85.7)
F4
721/1,278 (56.4)
868/1,358 (63.9)†

138/148 (93.2)
46/52 (88.5)



Total 1,945/2,749 (70.7) 2,622/3,746 (70.0) 312/389 (80.2) 146/177 (82.5) 22/33 (66.7) 26/29 (89.7)†

*–, data not collected.
†Molting or oviposition success values for infected and control ticks of the same tick stage were significantly different (p<0.05).

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