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A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
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Published on: December 9, 2015

Boutonneuse fever and climate variability.

Rita de Sousa1, Teresa Luz, Paulo Parreira

  • 1Centro de Estudos de Vectores e Doenças Infecciosas, Instituto Nacional de Saúde Dr. Ricardo Jorge, Avenida da Liberdade 5, 2965-575 Aguas de Moura, Portugal.

Annals of the New York Academy of Sciences
|November 23, 2006
PubMed
Summary

Climate change is altering boutonneuse fever (BF) seasonality in Portugal, with increased off-season cases observed. Low precipitation correlates with rising BF epidemiology, necessitating physician awareness.

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Area of Science:

  • Environmental Science
  • Epidemiology
  • Infectious Diseases

Background:

  • Boutonneuse fever (BF), a tick-borne illness, is endemic in Portugal, typically peaking in late spring and summer.
  • Recent climate variability in Portugal deviates from its usual temperate Mediterranean pattern.
  • The brown dog tick (Rhipicephalus sanguineus) transmits Rickettsia conorii complex strains, causative agents of BF.

Purpose of the Study:

  • To investigate the influence of climate change on the seasonality of boutonneuse fever (BF).
  • To compare laboratory-confirmed BF cases during the typical 'off-season' (October-February) from 2000-2005.

Main Methods:

  • Analysis of human sera samples submitted for laboratory diagnosis of Mediterranean spotted fever (MSF) between October and February.
  • Comparison of case numbers over a five-year period (2000-2005).

Main Results:

  • Out of 1,299 suspected MSF sera samples, 45 (3.4%) were confirmed positive.
  • A doubling in the number of positive BF cases was observed in the last two years of the study period.
  • BF epidemiology demonstrated a clear association with climate change, particularly with reduced precipitation levels.

Conclusions:

  • Boutonneuse fever epidemiology is significantly influenced by climate change, especially low precipitation.
  • An increase in off-season BF cases is evident, suggesting a shift in disease patterns.
  • Healthcare providers should be vigilant for increasing boutonneuse fever cases outside the traditional high season.