Spotted Fever in Brazil
Sunday, April 3rd, 2011The following background data on spotted fever in Brazil are abstracted from the Gideon e-book series. [1,2] (Primary references are available on request)
Time and Place:
Rickettsial spotted fever is known locally as Brazilian spotted fever, Sao Paulo fever and Febre maculosa brasileira.
- Rickettsial spotted fever was first reported in Brazil in 1920.
- Cases are reported in Minas Gerais, Bahia, Goias, Rio Grande do Sul and Espirito Santo.
- The disease has re-emerged in Rio de Janeiro in recent years.
Disease incidence and rates per 100,000 are depicted in the following graph. Between 6 and 27 fatal cases per year were registered during 2007 to 2010.
Geographical notes:
Outbreaks were reported in Minas Gerais during 1929 to 1944, but not during 1945 to 1980.
- Subsequent outbreaks were reported in Minas Gerais in 1981, 1984, 1992, 1995 and 2000.
- 92 cases (40% fatal) were confirmed in Minas Gerais during 1981 to 1989; 78 during 1992 to 1997 (including 3 fatal cases in 1996, and 2 in 1997).
67 cases were reported in Sao Paulo during 1985 to 2000; 224 (including 6 case-clusters) during 2001 to 2008 5 ; 5,949 suspected cases (206 confirmed) during 2003 to 2006.
- 17 cases (8 fatal) were reported in Pedreira county, Sao Paulo during 1985 to 1995.
- Five fatal cases were reported in Sao Paulo State in 2003.
- Eight outbreaks were reported in Sao Paulo State during 2005.
- A case of eschar-associated spotted fever rickettsiosis (species not determined) was reported in Bahia in 2007.
Prevalence surveys:
1.3% of Rhipicephalus sanguineus ticks in metropolitan Sao Paulo are infected by Rickettsia rickettsii (2009 publication)
1.3% of Amblyomma cajennense in Minas Gerais (1997 publication)
Rickettsia parkeri was identified in 9.7% of Amblyomma triste (a non-human biting tick) in Pauliceia County, Sao Paulo (2005).
Seroprevalence surveys:
10.6% of healthy students and 4.11% of dogs in the endemic areas of Minas Gerais (1998)
38.4% of humans, 7.6% of dogs and 25.9% of horses (Espirito Santo, Rickettsia spp., 2010 publication)
77.3% of horses and 31.3% of dogs in Pedreira Municipality, Sao Paulo State (2001)
1.6% of healthy persons in Minas Gerais (2005 publication)
25.7% of dogs in southern Brazil (Rickettsia parkeri, 2002 to 2003)
69.6% of dogs in metropolitan Sao Paulo (2009 publication)
4.4% of dogs from Sao Jose dos Pinhais, Parana State (2006 to 2007)
Reservoirs:
- The principal reservoir hosts are capybara (Hydrochaeris hydrochaeris) , horses and occasionally dogs.
- Natural infection has been identified in dogs in Sao Paulo.
- R. parkeri antibodies have been documented in dogs from urban areas in the western Brazilian Amazon. (Monte Negro, Rondonia)
Vectors:
The principal vectors are Amblyomma aureolatum (areas of Sao Paulo) and Amblyomma cajennense.
- Amblyomma cooperi has also been implicated (in Sao Paulo).
- Spotted fever-group rickettsiae have been found in Rhipicephalus sanguineus in Rio de Janeiro state.
Notable outbreaks:
1993 (publication year) – An outbreak (6 cases, 4 confirmed) was reported in Espirito Santo.
2004 (publication year) – An outbreak was reported in Campinas.
2004 – An outbreak (3 fatal cases) was reported in Maua (Grande Sao Paulo).
2005 – An outbreak (7 cases, 2 fatal) was reported in a mountain resort near Rio de Janeiro.
2008 – An outbreak (3 fatal cases) was reported in Sao Paulo State.
References:
1. Berger SA. Infectious Diseases of Brazil, 2011. 530 pp. Gideon e-book series, http://www.gideononline.com/ebooks/country/infectious-diseases-of-brazil/
2. Berger SA. Rocky Mountain Spotted Fever: Global Status, 2011. 18 pp. Gideon e-book series, http://www.gideononline.com/ebooks/disease/rocky-mountain-spotted-fever-global-status/


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