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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)

Main Article

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).

Main Article

Page created: August 14, 2011
Page updated: August 14, 2011
Page reviewed: August 14, 2011
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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