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J Wildl Dis. 2019 Jul 22. [Epub ahead of print]

EPIDEMIOLOGY OF CHLAMYDIA-INDUCED REPRODUCTIVE DISEASE IN MALE KOALAS (PHASCOLARCTOS CINEREUS) FROM SOUTHEAST QUEENSLAND, AUSTRALIA AS ASSESSED FROM PENILE URETHRAL SWABS AND SEMEN.

Author information

1
1   School of Agriculture and Food Sciences, University of Queensland, Gatton, Queensland 4343, Australia.
2
2   Institute of Health and Biomedical Innovation and School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, Q Block, 60 Musk Avenue, Kelvin Grove, Queensland 4059, Australia.
3
3   Faunavet, Independent Wildlife Veterinary Services, Glasshouse Mountains, Queensland 4518, Australia.
4
4   Endeavour Veterinary Ecology Pty. Ltd., 1695 Pumicestone Road, Toorbul, Queensland 4510, Australia.
5
5   Currumbin Wildlife Hospital, 27 Millers Drive, Currumbin, Queensland 4223, Australia.
6
6   Moggill Koala Rehabilitation Centre, 55 Priors Pocket Road, Moggill, Queensland 4070, Australia.

Abstract

'Declining population sizes of koalas (Phascolarctos cinereus) in SE Queensland (QLD), Australia can partially be attributed to chlamydiosis, with the majority of epidemiological studies focusing on the prevalence of infection and associated pathology in female koalas, with lesser attention given to males. We aimed to explore the epidemiology of Chlamydia pecorum infection in the male urogenital tract from wild (hospitalized and free-ranging) koalas in SE QLD. Although 67% of male koalas were infected with C. pecorum in their urogenital tract and 55% were shedding the organism in their semen, only a third of the males sampled presented with overt signs of urogenital disease. Infection with C. pecorum was lower in populations from rural locations, compared with periurban locations, with a corresponding low association between urogenital infection and clinical disease. The presence of C. pecorum in penile urethral swabs was a good predictor of the presence of C. pecorum in semen, with a significant correlation (P=0.006) in 58% of males. In contrast, the C. pecorum load in penile urethral swabs was not a good predictor of the C. pecorum load in semen, with no significant correlation. In addition, 57% of male koalas had large numbers of bacterial copy numbers in the penile urethra (upper quartile) and 40% shedding into semen with no overt signs of disease. Investigation of the association of C. pecorum infection, body condition score, and age revealed that the highest incidence of urogenital infection occurred in males with the lowest body score (1 out of 10). Furthermore, 63% of sexually mature male koalas (>2 yr old) had urethral infections and 50% had C. pecorum in their semen. Our study suggested that the role of chlamydia in male koala infertility has been previously underestimated.

KEYWORDS:

; epidemiology; koala; pathology; penile urethra; semen

PMID:
31329524

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