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Maternal administration of erythromycin fails to eradicate intrauterine ureaplasma infection in an ovine model

Dando, Samantha J., Nitsos, Ilias, Newnham, John P., Jobe, Alan H., Moss, Timothy J.M., & Knox, Christine L. (2010) Maternal administration of erythromycin fails to eradicate intrauterine ureaplasma infection in an ovine model. Biology of Reproduction, 83(4), pp. 616-622.

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    Abstract

    Erythromycin is the standard antibiotic used for treatment of Ureaplasma species during 3 pregnancy; however, maternally administered erythromycin may be ineffective at eliminating 4 intra-amniotic ureaplasma infections. We asked if erythromycin would eradicate intra-amniotic 5 ureaplasma infections in pregnant sheep. At 50 days of gestation (d, term=150d) pregnant ewes 6 received intra-amniotic injections of erythromycin-sensitive U. parvum serovar 3 (n=16) or 10B 7 medium (n=16). At 100d, amniocentesis was performed; five fetal losses (ureaplasma group: 8 n=4; 10B group: n=1) had occurred by this time. Remaining ewes were allocated into treatment 9 subgroups: medium only (M, n=7); medium and erythromycin (M/E, n=8); ureaplasma only (Up, 10 n=6) or ureaplasma and erythromycin (Up/E, n=6). Erythromycin was administered intra11 muscularly (500 mg), eight-hourly for four days (100d-104d). Amniotic fluid samples were 12 collected at 105d. At 125d preterm fetuses were surgically delivered and specimens were 13 collected for culture and histology. Erythromycin was quantified in amniotic fluid by liquid 14 chromatography-mass spectrometry. Ureaplasmas were isolated from the amniotic fluid, 15 chorioamnion and fetal lung of animals from the Up and Up/E groups, however, the numbers of 16 U. parvum recovered were not different between these groups. Inflammation in the 17 chorioamnion, cord and fetal lung was increased in ureaplasma-exposed animals compared to 18 controls, but was not different between the Up and Up/E groups. Erythromycin was detected in 19 amniotic fluid samples, although concentrations were low (<10-76 ng/mL). This study 20 demonstrates that maternally administered erythromycin does not eradicate chronic, intra- amniotic ureaplasma infections or improve fetal outcomes in an ovine model, potentially due to 22 the poor placental passage of erythromycin.

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    ID Code: 41043
    Item Type: Journal Article
    Additional URLs:
    Keywords: microbiology, placenta, placental transport, pregnancy
    DOI: 10.1095/biolreprod.110.084954
    ISSN: 0006-3363
    Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300)
    Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > MEDICAL MICROBIOLOGY (110800)
    Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > PAEDIATRICS AND REPRODUCTIVE MEDICINE (111400)
    Divisions: Past > Schools > Cell & Molecular Biosciences
    Past > QUT Faculties & Divisions > Faculty of Science and Technology
    Current > Institutes > Institute of Health and Biomedical Innovation
    Copyright Owner: Copyright 2010 Society for the Study of Reproduction, Inc.
    Deposited On: 30 Mar 2011 08:19
    Last Modified: 01 Mar 2012 10:50

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