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The only countries with reported cases of bartonellosis are Peru, Ecuador and Colombia.

About “el Nino” weather phenomena, there is evidence that shows the influence of the weather changes and bartonellosis: Zhou J, Laughlin L, Andre R, et al. El Nino and the spread of bartonellosis epidemics in Peru. EOS Trans Am Geophysical Union 2002;83:157, 160-1

Some definitions:

Epidemic: number of cases in excess of that expected in a specific population for a given time interval.

Endemic: The constant or usual presence of an infection or disease in a population or community.

Epidemiology: is a quantitative science underlying public health and medicine. It is the study of the distribution and determinants of disease or health related events in specified populations and the application of this study to the control of health problems.