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Meta-analysis to estimate the load of Leptospira excreted in urine: beyond rats as important sources of transmission in low-income rural communities
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Meta-analysis to estimate the load of Leptospira excreted in urine: beyond rats as important sources of transmission in low-income rural communities
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Meta-analysis to estimate the load of Leptospira excreted in urine: beyond rats as important sources of transmission in low-income rural communities
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Journal Article
Meta-analysis to estimate the load of Leptospira excreted in urine: beyond rats as important sources of transmission in low-income rural communities
2017
Overview
Background
Leptospirosis is a major zoonotic disease with widespread distribution and a large impact on human health. Carrier animals excrete pathogenic Leptospira primarily in their urine. Infection occurs when the pathogen enters a host through mucosa or small skin abrasions. Humans and other animals are exposed to the pathogen by direct contact with urine, contaminated soil or water. While many factors influence environmental cycling and the transmission of
Leptospira
to humans, the load of pathogenic
Leptospira
in the environment is likely to play a major role. Peridomestic rats are often implicated as a potential source of human disease; however exposure to other animals is a risk factor as well. The aim of this report is to highlight the importance of various carrier animals in terms of the quantity of
Leptospira
shed into the environment. For this, we performed a systematic literature review and a meta-analysis of the amount of pathogen that various animal species shed in their urine.
Results
The quantity of pathogen has been reported for cows, deer, dogs, humans, mice, and rats, in a total of 14 research articles. We estimated the average
Leptospira
per unit volume shed by each animal species, and the daily environmental contribution by considering the total volume of urine excreted by each carrier animal. Rats excrete the highest quantity of
Leptospira
per millilitre of urine (median = 5.7 × 10
6
cells), but large mammals excrete much more urine and thus shed significantly more
Leptospira
per day (5.1 × 10
8
to 1.3 × 10
9
cells).
Conclusions
Here we illustrate how, in a low-income rural Ecuadorian community, host population demographics, and prevalence of
Leptospira
infection can be integrated with estimates of shed
Leptospira
to suggest that peridomestic cattle may be more important than rats in environmental cycling and ultimately, transmission to humans.
Publisher
BioMed Central,BioMed Central Ltd,Springer Nature B.V
