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Asian Pac J Trop Biomed. 2012 Jun;2(6):474-8. doi: 10.1016/S2221-1691(12)60079-3.

Diversity and frequency of Nocardia spp. in the soil of Isfahan province, Iran.

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  • 1Molecular Biology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran.

Abstract

OBJECTIVE:

To isolate and identify Nocardia spp. from soil in different regions of Isfahan province in the center of Iran.

METHODS:

This study was conducted in 32 districts (16 cities and 16 villages) in Isfahan province during two years. A total of 800 soil samples from these regions were studied by using kanamycin. The isolated Nocardia species were examined by gram and acid-fast staining and were identified biochemically and morphologically. The frequency and distribution of Nocardia spp. were determined in relation to different factors such as soil pH and temperate climate.

RESULTS:

From 153 (19.1%) Nocardia isolates identified, Nocardia asteroids (N. asteroids) complex (45.5%) and Nocardia brasiliensis (N. brasiliensis) (24.7%) were the most frequently isolated species, followed by Nocardia otitidiscaviarum (2.2%), Nocardiopsis dassonvillei, Actinomadura actinomadura (each 1.7%) and Nocardia transvalensis (1.1%) and also unknown spp. (23.0%). In this study, most species (54.4%) of Nocardia, especially N. asteroides complex were isolated from soils with pH: 7.01-8, whereas in pH: 8.01-9 more N. brasiliensis was isolated. The most Nocardia spp. was detected from regions with semi-nomadic and temperate climate (41.1%).

CONCLUSIONS:

N. asteroids complex is more prevalent in Isfahan province and soil can be a potential source of nocardiosis infections. It is to be considering that climate and soil pH are involved in the frequency and diversity of aerobic Actinomycetes.

KEYWORDS:

Actinomycetes; Climate; Iran; Isfahan; Nocardia; Nocardia asteroids; Nocardiosis; Soil microbiology

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