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2002
Ocular Microbiology and Immunology Group, Abstract 5
OMIG
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Can
Topical Ocular Antibiotics Induce Systemic Resistance?
Bruce Gaynor,1,2 Vicky Cevallos,1 Yinghui Miao,1 Elizabeth Yi,1 Hem
Jha,3 Ramesh Bhattta,3
JSP Chaudary,3 John Whitcher,1,2 Susan Osaki-Holm,1 Alicia Fry,4
and Tom Lietman1,2
1F.I. Proctor Foundation and the 2Department of Ophthalmology, University
of California, San Francisco, 3Geta Eye Hospital, Geta, Nepal, 4Respiratory
Diseases Branch,
Division of Bacterial and Mycotic Diseases, Centers For Disease
Control, Atlanta Georgia
Purpose:
A cornerstone of the WHO's program to eliminate blinding trachoma
is the use of mass antibiotic administrations. Historically, topical
tetracycline has been used for the ocular chlamydia that causes
active trachoma; recently, oral azithromycin has been favored due
to greater compliance. Here we compare the amount of naso-pharyngeal
pneumococcal resistance found after topical tetracycline versus
oral azithromycin.
Methods:
Two villages in western Nepal were treated as part of the Proctor
Foundation
trachoma control program. One village was given 3 annual oral azithromycin
distributions
(single dose, 20 mg/kg) and the other village 3 annual topical tetracycline
distributions (BID for 6 weeks). All children age 1-10 years old
were offered treatment in each village. In May 2001, 6 months after
the 3rd treatment in each of the villages, all children 1-7 years
were surveyed for Streptococcus pneumoniae carriage and resistance.
Nasopharyngeal swabs were performed on each child and transported
to the Proctor Foundation laboratory, where pneumococcus was isolated
and minimum inhibitory concentration testing was performed.
Results:
Streptococcus pneumoniae nasopharyngeal carriage was 122/138 (88%)
in the
tetracycline village and 153/183 (84%) in the azithromycin village
(p = 0.27). Tetracycline-
resistant pneumococcus isolates were identified in 38/138 (31%)
of the swabs from the village treated with tetracycline and 33/183
(22%) from the village treated with azithromycin (p =0.01). Azithromycin-resistant
pneumococcus isolates were identified in 0/138 (0%) of the swabs
from the village treated with tetracycline and 5/183 (3%) of the
swabs from village treated with azithromycin (p = 0.04).
Conclusions:
There is a high prevalence of S. pneumoniae in the nasopharynx of
children in Nepal. Mass annual antibiotic administrations of both
topical tetracycline and oral
azithromycin can alter the level of drug resistant S. pneumoniae
in a community. Contrary to
common wisdom, topical antibiotics can have an effect on systemic
bacterial resistance.
Grant &
Financial Support: Alta California Foundation, Geta Eye Hospital,
Helen Keller
International, Pfizer Inc., National Institute of Allergy &
Infectious Diseases (K08 AI 01441)
OMIG
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