Bactericidal activity of copper and noncopper paints.
OBJECTIVE
To screen copper and noncopper paints for their bactericidal effectiveness in rendering surfaces self-disinfecting.


METHODS
Tested paints were applied to glass coverslips, cured, inoculated with test organisms (Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Enterococcus faecalis), and dried. After 0, 24, or 48 hours, surviving organisms were eluted and enumerated, and counts compared with those obtained from inoculated control (unpainted) coverslips for the corresponding time periods. Copper elution from select copper paints was quantified by complete immersion of coated coverslips followed by spectroscopic analysis to infer a threshold relationship between kill and copper release.


RESULTS
Nearly all of the tested copper paints were capable of reducing organism counts to negligible levels within 24 hours. Exterior latex paints supplemented with a fungicide were similarly efficacious. Standard interior latex paint reduced bacterial counts to nearly zero within 24 hours for E coli and P aeruginosa, and to zero within 48 hours for E faecalis. However, substantial survival of S aureus occurred (up to 4 logs at 24 hours). Chi-squared analysis of elution and cidal data indicated that lethality was dependent on copper release in excess of 32 micrograms.


CONCLUSIONS
The data support presumptive bactericidal claims for several copper and noncopper paints. Despite controversy over environment-based contagion, such paints could be used to render surfaces self-disinfecting in strategic locations where environmental causation of nosocomial infections is suspected.
Cooney
T E
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Hamot Medical Center Research Department, Erie, Pennsylvania 16550, USA.
D016009:Chi-Square Distribution; D015169:Colony Count, Microbial; D003300:Copper / Q000494:pharmacology*; D003428:Cross Infection / Q000517:prevention & control*; D004202:Disinfectants / Q000494:pharmacology*; D013293:Enterococcus faecalis / Q000187:drug effects; D004926:Escherichia coli / Q000187:drug effects; D005160:Facility Design and Construction / Q000379:methods*; D006801:Humans; D017053:Infection Control / Q000379:methods*; D008826:Microbial Sensitivity Tests; D010150:Paint; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D013211:Staphylococcus aureus / Q000187:drug effects
D004202:Disinfectants; D003300:Copper