Ferqnency of some Legionella species isolated from cooling towers, during two years

Abstract

One   hundred   Ninty   two  s mples  were  collected from   (Cooling towers) between           the                 period       1 /l/2004-13/12/2005.   The                          Results Rev a)ecL that  physical    and   chemic:a)  analysefor watr  samples including   Tempera  re,,  pH and  cWodde  concentration  ranges were f01:md to be l5°C 45°C, 6, 8-7.8- and 0. 2-0.5 mg\L.

Five species of Legion.ella :Were identified, these were Legionella pneumophlla, legionella dumoffii ,    Legionella Jordans, Legionidla oeakridensis, Legiviiella micdadei.

Legion(!/la   - pneu-mophila    were     predominant     followied'         by

L.micdadei.

The  perc.ent.a.ge  occurancc   of species   were  differe during   any month  of the, year. It was found  that the  p(!rcentage  of occurance of

spccie:s in  the  summer  is  more  than the  other  season, and  the

percentage of occurance Qf species differs between Jan 2004  and Dec

2005.

The average nun1ber of haeerial species cells was 1000' cells\mi  in

the  water during  the  summer season  and  less_

quring the othe.r ·seasons.