Biofilm bacterial diversity: Association with disease severity in contact lens related keratitis L....
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Biofilm bacterial diversity: Association with disease severity in contact lens related keratitis L. Wiley1, M. Mcallister1, L.A. Wiley2, T. Elliott2, D
Biofilm bacterial diversity: Association with disease severity
in contact lens related keratitis L. Wiley1, M. Mcallister1, L.A.
Wiley2, T. Elliott2, D. Bridge2, J. Odom1, J. Olson2, West Virginia
University Eye Institute1, Department of Microbiology, West
Virginia University2 Purpose : Biofilm formation in contact lens
cases may predispose to the development of contact lens related
keratitis. To better understand the composition of contact lens
case biofilm, we used 16S ribosomal RNA (rRNA) gene sequencing to
examine cases from patients with mild keratitis, keratitis with
focal infiltrate, and contact lens related ulcers, as well as cases
from asymptomatic controls. Methods: Contact lens cases were
obtained from 5 patients with mild diffuse keratitis, 8 with
keratitis and focal infiltrates, and 4 with contact lens related
ulcers. Eight cases from asymptomatic soft contact lens wearers
were processed as controls. Biofilms were removed from lens cases
by scraping and sonication, and DNA was extracted using the Mo Bio
Microbial DNA Isolation Kit. Universal primers were used to amplify
the bacterial 16S rRNA gene, PCR products were purified, cloned
into the pCR 4-TOPO vector (Invitrogen), then re-amplified and
sequenced. Sequences were classified by BLAST analysis against
GenBank. Each sequence was matched with at least one database entry
at the genus level (identity >95%). Results: The number of
bacterial types isolated from the case correlated with increasing
severity of disease (Spearman rank order correlation