How fast kills 70% ethanol

Karl Roberts kr1 at PGSTUMAIL.PG.CC.MD.US
Mon Oct 6 06:54:09 EST 1997


Dear Koen,
	I am not sure that a few seconds of alcohol contact with a fomite
is sufficient to disinfect properly.  We commonly use benzalkonium
chloride (zephiran) in our teaching lab, wipe with a sponge, and simply
let air dry.  Since you are using E. coli and mycobacteria, I would
suggest o-cresol (lysol), before and after use of the counter surface. 
Once again, I would air-dry rather than wipe off quickly with a towel, to
leave disinfectant residue on the fomite. I hope this helps.
Karl J. Roberts


On Mon, 6 Oct 1997, Koen De Smet wrote:

> Dear newsgroupies,
> 
> We are a molecular biology lab, using mainly E.coli and mycobacteria in 
> our research. We routinely spray 70% ethanol on surfaces etc to clean 
> them after microbiological work. The ethanol is then wiped away almost 
> immediately with a tissue.
> 
> But how fast-acting is 70% ethanol? Is a few seconds contact long enough 
> to kill bacteria?  
> 
> TIA
> Koen De Smet
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