Seropositivity for <i>Rickettsia</i> spp. and <i>Ehrlichia</i> spp. in the human population of Mato Grosso, Central-Western Brazil

Bezerra, Maria Cristina Fuzari; Melo, Andréia Lima Tomé; Taques, Isis Indaiara Gonçalves Granjeiro; Aguiar, Daniel Moura de; Pacheco, Richard Campos; Slhessarenko, Renata Dezengrini

doi:10.1590/0037-8682-0318-2016

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Short Communications • Rev. Soc. Bras. Med. Trop. 50 (03) • May-Jun 2017 • https://doi.org/10.1590/0037-8682-0318-2016 copy

Seropositivity for Rickettsia spp. and Ehrlichia spp. in the human population of Mato Grosso, Central-Western Brazil

Authorship SCIMAGO INSTITUTIONS RANKINGS

Abstract

INTRODUCTION

The epidemiology of Rickettsia and Ehrlichia species infection is underestimated in Mato Grosso State.

METHODS:

Serum samples obtained during a Dengue outbreak in 2011-2012 were tested via indirect immunofluorescence and/or ELISA.

RESULTS:

Samples from 19/506 (3.8%) patients presented antibodies for at least one of three Rickettsia species; 2/506 (0.4%) samples reacted against Ehrlichia canis. Most afflicted patients are residents of cities from the south-central region of the state, where these diseases have been reported in animals.

CONCLUSIONS:

These results show serological evidence of human exposure to Rickettsia and Ehrlichia species in Mato Grosso State.

Keywords:
Rickettsiosis; Ehrlichiosis; Immunofluorescence assay

Sample	R. rickettsii	R. amblyommii	R. parkeri	E. canis	PAIHR*	RT-PCR
1	NR**	64	NR	NR	-	Negative
2	64	128	NR	-	-	Negative
3	64	NR	NR	-	-	DENV-4
4	128	128	128	-	-	DENV-4
5	64	64	NR	-	-	Negative
6	64	NR	256	-	R. parkeri	Negative
7	256	128	128	-	-	Negative
8	64	128	NR	-	-	Negative
9	128	NR	NR	-	R. rickettsii	Negative
10	256	256	128	-	-	DENV-4
11	64	64	NR	-	-	Negative
12	256	256	512	-	-	Negative
13	512	512	1,024	-	-	Negative
14	128	128	256	-	-	DENV-4
15	64	256	NR	-	R. amblyommii	Negative
16	512	256	256	-	-	Negative
17	256	128	1,024	-	R. parkeri	Negative
18	64	64	128	-	-	Negative
19	NR	NR	256	-	R. parkeri	DENV-4
20	NR	NR	NR	1,280	-	Negative
21	NR	NR	NR	80	-	DENV-4

Variable	Rickettsia spp.	p-value	Ehrlichia canis	p-value
	N (%)		N (%)
Sex
female	11 (57.9)	0.489	1 (50.0)	1,000
male	8 (42.1)		1 (50.0)

Age (years)			-
<5	1 (5.3)	0.395	-	-
5-9	2 (10.5)	0.341	1 (50.0)	-
20-39	10 (52.6)	0.641	1 (50.0)	1,000
40-59	5 (26.3)	0.349	-	0.317
≥60	1 (5.3)	0.541		-

Ethnicity			2 (100.0)
brown	10 (52.6)	1.000	-	0.499
white	4 (21.0)	0.757	-	-
black	2 (10.5)	0.297	-	-
yellow	1 (5.3)	0.142	-	-
not reported	2 (10.5)	0.268		-

Area of residency			2 (100.0)
urban	18 (94.7)	0.463	-	1,000
not reported	1 (5.3)	0.236		-

Visit to rural/sylvatic areas			-
yes	2 (10.5)	0.646	2 (100.0)	-
no	15 (78.9)	0.151	-	0.528
not reported	2 (10.5)	0.075		-

Residency city			2 (100.0)
Cuiabá	16 (84.2)	1.000	-	1,000
Várzea Grande	1 (5.3)	0.709	-	-
Poconé	1 (5.3)	0.174	-	-
Pontes e Lacerda	1 (5.3)	0.418		-

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[1] Corresponding author: Dra. Renata Dezengrini Slhessarenko e-mail:renatadezengrini@yahoo.com.br