1887

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Volume 71, Issue 5

Cervicovaginal loads of spp. are increased in immunocompetent women with persistent high-risk human papillomavirus infection No Access

Abstract

Two high-oncogenic-risk human papilomavirus (hrHPV) genotypes – HPV16 and HPV18 – cause most of the cases of cervical cancer worldwide. Bacterial vaginosis is associated with increased hrHPV persistence, although the mechanism underlying this association remains unclear. spp. are detected in nearly all cases of bacterial vaginosis and are the major source of cervicovaginal sialidases. The gene is present in virtually all sialidase-producing strains and has been proposed as a potential marker for persistent hrHPV infection.

spp. load and the gene are associated with hrHPV persistence.

To compare the cervicovaginal load of spp. and the frequency of the gene between women with persistent HPV16 and/or HPV18 infection and those who cleared the infection after 11 months.

Among a population of 1638 HPV screened, we detected 104 with positive HPV16 and/or HPV18 results. Samples were obtained at two time points (baseline and at a median of 11 months at follow-up) and tested using the Linear Array HPV Genotyping kit (Roche Molecular Systems, Pleasanton, CA, USA). Based on their HPV16/HPV18 status at enrolment and follow-up, participants were assigned to ‘persistence’ or ‘clearance’ groups. We used cervicovaginal fluid samples obtained upon enrolment to determine the load of the 23 s rRNA gene of spp. and the presence of the gene using real-time polymerase chain reaction (PCR). We compared spp. loads and frequency between the groups by, respectively, Mann–Whitney and chi-squared tests, with a -value <0.05 considered to be significant.

Of the 104 participants who were positive for HPV16/HPV18, 73 (70.2 %) persisted with at least 1 of the baseline genotypes at follow-up, while 31 (29.8 %) cleared the infection in this time frame. Participants in the persistence group had significantly higher loads of spp. [5.8E+02 (0–3.0E+05) copies µl] than those in the clearance group [9.9E+01 (0–7.7E+04) copies µl] (=0.03). The baseline frequency of was higher in the persistence’ (=46, 63.0 %) than in the clearance (=14, 45.2 %) group, although this was not statistically significant (=0.09).

These findings reinforce the negative effect of vaginal microbiota for the clearance of hrHPV and indicate a possible association between sialidase-producing species with hrHPV persistence.

  • Received:
  • Accepted:
  • Published Online:
Keyword(s): clearance , Gardnerella , high risk HPV , HPV , persistence , sialidase and vaginal microbiota
Funding
This study was supported by the:
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Award 88882.432880/2019-01)
    • Principle Award Recipient: RafaelBelleti
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (Award #2012/10403-2)
    • Principle Award Recipient: CamilaMarconi
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (Award #12/01278-0)
    • Principle Award Recipient: MárciaGuimarães da Silva
© 2022 The Authors
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2022-05-17
2024-04-23
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Cervicovaginal loads of Gardnerella spp. are increased in immunocompetent women with persistent high-risk human papillomavirus infection
J. Med. Microbiol. 71, 001527 (2022); https://doi.org/10.1099/jmm.0.001527
/content/journal/jmm/10.1099/jmm.0.001527
/content/journal/jmm/10.1099/jmm.0.001527
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