Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Penetration of airborne microorganisms through a surgical mask and a dust/mist respirator.

Authors
Willeke-K; Qian-Y; Donnelly-J; Grinshpun-S; Ulevicius-V
Source
Am Ind Hyg Assoc J 1996 Apr; 57(4):348-355
NIOSHTIC No.
00230532
Abstract
A surgical mask was compared with a dust/mist respirator for aerosol penetration of bacteria of different aspect ratio (length to width), size and shape. Bacteria used included Streptococcus-salivarius, Bacillus-megatherium, Pseudomonas-fluorescens, and Bacillus- alcalophilus. Inert spherical test particles composed of corn-oil were also used. The mask or respirator was sealed to a mannequin, and exposed to an aerosol in a test chamber. A pump was used to produce airflows of 16, 32, 50 and 80 liters/minute through the mask or respirator to simulate breathing. An aerodynamic size spectrometer was used to measure aerosol concentrations. The collection efficiency of nonspherical bacteria was always higher than that of spherical test particles. Penetration of bacteria through the filter of either the mask or the respirator decreased with increasing aspect ratio for a given aerodynamic diameter. P- fluorescens, similar in size and shape to Mycobacterium- tuberculosis, had a penetration of about 50 to 60% of that of spherical test particles of the same aerodynamic diameter. Both the surgical mask and the dust/mist respirator showed the same dependence on aspect ratio, in spite of differences in efficiency.
Keywords
NIOSH-Publication; NIOSH-Grant; Respirators; Respiratory-protective-equipment; Aerosol-particles; Microorganisms; Infection-control; Author Keywords: aerodynamic size spectrometer; bacterial penetration; Mycobacterium tuberculosis; respirator; efficiency; microorganism
Contact
Environmental Health University of Cincinnati 3223 Eden Avenue Cincinnati, OH 45267-0056
CODEN
AIHAAP
Publication Date
19960401
Document Type
Journal Article
Funding Amount
287049
Funding Type
Grant
Fiscal Year
1996
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002948; Grant-Number-R01-OH-003244
ISSN
0002-8894
Source Name
American Industrial Hygiene Association Journal
State
OH
Performing Organization
University of Cincinnati, Cincinnati, Ohio
TOP