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Rickettsia slovaca in Dermacentor marginatus and tick-borne lymphadenopathy, Tuscany, Italy.

Selmi M, Bertolotti L, Tomassone L, Mannelli A - Emerging Infect. Dis. (2008)

Bottom Line: Of 263 patients in Tuscany, Italy, from whom ticks were removed during July 2005-May 2007, five showed signs of tick-borne encephalopathy.Of the ticks, 17 were Dermacentor marginatus; 6 (35.3%) of these were identified by sequence analysis as containing Rickettsia slovaca.Tick-borne lympadenopathy occurs in this area.

View Article: PubMed Central - PubMed

Affiliation: Osservatorio Permanente per Patologie a Trasmissione Vettoriale, Lucca, Italy. m.selmi@usl2.toscana.it

ABSTRACT
Of 263 patients in Tuscany, Italy, from whom ticks were removed during July 2005-May 2007, five showed signs of tick-borne encephalopathy. Of the ticks, 17 were Dermacentor marginatus; 6 (35.3%) of these were identified by sequence analysis as containing Rickettsia slovaca. Tick-borne lympadenopathy occurs in this area.

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Related in: MedlinePlus

Distribution of tick-borne lymphadenopathy cases in Tuscany, Italy. Circles indicate cases, squares indicate patients bitten by Dermacentor marginatus who were not classified as case-patients, and triangles indicate emergency units. Negative (white symbols) and positive (dark symbols) PCR results for spotted fever group rickettsiae are indicated.
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Related In: Results  -  Collection


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Figure 1: Distribution of tick-borne lymphadenopathy cases in Tuscany, Italy. Circles indicate cases, squares indicate patients bitten by Dermacentor marginatus who were not classified as case-patients, and triangles indicate emergency units. Negative (white symbols) and positive (dark symbols) PCR results for spotted fever group rickettsiae are indicated.

Mentions: Ticks were classified by using standard identification keys (8) and stored in 70% ethanol until DNA extraction. D. marginatus females were measured, and the degree of engorgement (tick engorgement index [TEI]) was visually estimated. Ticks were ranked by 3 TEI levels: 1 = completely unengorged, 2 = intermediate (idiosoma length ≈2× scutum width), and 3 = engorged (idiosoma length >2× scutum width). Association between TEI levels and occurrence of clinical symptoms was evaluated by using the Fisher exact test. All statistical analyses were conducted by using R statistical software (10). Arcview 3.3 (Environmental Systems Research Institute Inc., Redlands, CA, USA) was used to map the geographic distribution of cases in the study area (Figure 1).


Rickettsia slovaca in Dermacentor marginatus and tick-borne lymphadenopathy, Tuscany, Italy.

Selmi M, Bertolotti L, Tomassone L, Mannelli A - Emerging Infect. Dis. (2008)

Distribution of tick-borne lymphadenopathy cases in Tuscany, Italy. Circles indicate cases, squares indicate patients bitten by Dermacentor marginatus who were not classified as case-patients, and triangles indicate emergency units. Negative (white symbols) and positive (dark symbols) PCR results for spotted fever group rickettsiae are indicated.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2600248&req=5

Figure 1: Distribution of tick-borne lymphadenopathy cases in Tuscany, Italy. Circles indicate cases, squares indicate patients bitten by Dermacentor marginatus who were not classified as case-patients, and triangles indicate emergency units. Negative (white symbols) and positive (dark symbols) PCR results for spotted fever group rickettsiae are indicated.
Mentions: Ticks were classified by using standard identification keys (8) and stored in 70% ethanol until DNA extraction. D. marginatus females were measured, and the degree of engorgement (tick engorgement index [TEI]) was visually estimated. Ticks were ranked by 3 TEI levels: 1 = completely unengorged, 2 = intermediate (idiosoma length ≈2× scutum width), and 3 = engorged (idiosoma length >2× scutum width). Association between TEI levels and occurrence of clinical symptoms was evaluated by using the Fisher exact test. All statistical analyses were conducted by using R statistical software (10). Arcview 3.3 (Environmental Systems Research Institute Inc., Redlands, CA, USA) was used to map the geographic distribution of cases in the study area (Figure 1).

Bottom Line: Of 263 patients in Tuscany, Italy, from whom ticks were removed during July 2005-May 2007, five showed signs of tick-borne encephalopathy.Of the ticks, 17 were Dermacentor marginatus; 6 (35.3%) of these were identified by sequence analysis as containing Rickettsia slovaca.Tick-borne lympadenopathy occurs in this area.

View Article: PubMed Central - PubMed

Affiliation: Osservatorio Permanente per Patologie a Trasmissione Vettoriale, Lucca, Italy. m.selmi@usl2.toscana.it

ABSTRACT
Of 263 patients in Tuscany, Italy, from whom ticks were removed during July 2005-May 2007, five showed signs of tick-borne encephalopathy. Of the ticks, 17 were Dermacentor marginatus; 6 (35.3%) of these were identified by sequence analysis as containing Rickettsia slovaca. Tick-borne lympadenopathy occurs in this area.

Show MeSH
Related in: MedlinePlus