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Study of Chernobyl catastrophe influence on bovine TB epizootic process intensity in radioactive polluted and ``clean'' territories of Ukraine in 1983–2007

Abstract number: P1567

Skrypnyk A., Zavgorodniy A., Stegniy B., Skrypnyk V., Gerilovych A.

Objectives: As a consequence of Chernobyl catastrophe more than 144 000 ha of the agricultural lands were polluted by radiation. The considerable amount of cattle, including those reacted to tuberculin, is kept there. The aim of this work was to study the epizootic intensity of bovine TB in radioactive polluted territories of Ukraine before and after Chernobyl catastrophe as well as to compare it with such a situation in the territories free from radiation.

Methods: The most polluted are Kyiv, Rivne, Zhytomyr, Cherkasy and Chernihiv regions (``polluted'' areas). Other regions are relatively ``clean''. The epizootic situation intensity was assessed with the help of such indices: incidence (on 100 000 heads) and focal index. Incidence was calculated as ratio of the amount of newly detected cattle reacted to tuberculin to the total amount of cattle in the period of 1 year. Focal index was calculated as ratio of the amount of newly detected cattle reacted to tuberculin to the amount of outbreaks in the period of 1 year.

Results: The graphic shows that before the catastrophe in 1986 the incidence in ``polluted'' areas was 20–25, in ``clean'' – 47–43. From 1987 till 2007 epizootic situation in ``clean'' areas was characterised by steady decreasing of the incidence from 40 to 3 respectively. In ``polluted'' areas the incidence had the tendency to increase slightly from 24 in 1986 to 32 in 1988 and thereafter it is decreasing till present time, however in the same time it exceeds the level typical for ``clean'' areas. Such a situation is well retraced with the help of trend lines – the trend line of ``clean'' territories is decreasing much more steeply then the trend line of ``polluted'' areas which is decreasing very gradual.

The epizootic process intensity is similarly characterised by the focal index. In 1983–85 this index in ``clean'' areas exceeded such in ``polluted'' upon the average in 1.61 times, in 1990–92 this ratio was in the range of 1. In 2006–07 the average amount of infected cattle per 1 outbreak in ``polluted'' areas exceeded the same index in ``clean'' areas in 2.72 and 1.96 times respectively.

Conclusion: Obtained data demonstrates more intensive epizootic process of bovine TB in radioactive polluted areas. This could be explained by the influence of high radiation doses onto animal organism as well as onto the biological properties of mycobacteria.

Session Details

Date: 19/04/2008
Time: 00:00-00:00
Session name: 18th European Congress of Clinical Microbiology and Infectious Diseases
Subject:
Location: Barcelona, Spain
Presentation type:
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