In a longitudinal study, Brotman and co-workers studied a North American cohort of 32 sexually active, premenopausal women over the course of 16 weeks using self-sampling at twice-weekly intervals [53]. From a total of 930 samples, women with CSTs III and IV were most likely to be HPV positive (71 and 72 %, respectively) (Table 1). In addition to examining the link between the vaginal microbiota and HPV acquisition and persistence, Brotman and colleagues also suggested that CST II, dominated by L. gasseri, may be associated with the most rapid clearance of acute HPV infection. The authors defined rapid clearance as transition from HPV negativity to positivity, and back to negativity, and used continuous time multi-state Markov modelling to calculate adjusted transition rate ratios. Such an observation might point to L. gasseri as a potential therapeutic species for maintaining cervical health; however, it is pertinent to note that only two of the 32 women had a predominantly CST II VMB, and that two additional women in the study with CST III and CST IV VMBs also exhibited the same rapid patterns for acquisition and clearance over the 16-week study period. Further studies are necessary to confirm temporal relationships between vaginal microbiota and HPV infection and to determine whether any difference exists in the dynamics of high- and low-risk HPV subtypes, which is most clinically relevant.
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By definition, members of a particular bacterial species have a total nucleotide identity of >70 % across their genomes [139]. The remaining genome diversity gives rise to the existence of different strains, which may have different functional genes that induce different biological properties. Further evidence is required in order to determine whether only certain strains of a particular bacterial species are either protective or pathogenic with regards to HPV and cervical dysplasia, and a recent study by Abdelmaksoud and colleagues [140] hints this is very likely. The team compared strains of L. crispatus that colonised women with, and without BV, demonstrated considerable genomic diversity within the species and identified several genes exclusive to the presence or absence of BV [140]. These genes require further investigation to help understand the protective mechanisms exploited by certain bacteria, and other disease-associated species should also be studies using metagenomic techniques, which in turn will support development of appropriate probiotic preparations.
Clinicians should not treat acute pain with ER/LA opioids or initiate opioid treatment for subacute or chronic pain with ER/LA opioids, and clinicians should not prescribe ER/LA opioids for intermittent use. Because of the longer half-life and longer duration of effects (e.g., respiratory depression) of ER/LA opioids (e.g., methadone, fentanyl patches, or extended-release versions of oxycodone, hydromorphone, hydrocodone, or morphine), clinicians should not prescribe ER/LA opioids for the treatment of acute pain. ER/LA opioids should be reserved for severe, continuous pain and should be considered only for patients who have received certain dosages of immediate-release opioids daily (e.g., 60 mg daily of oral morphine, 30 mg daily of oral oxycodone, or equianalgesic dosages of other opioids) for at least 1 week (193). When changing to an ER/LA opioid for a patient previously receiving a different immediate-release opioid, clinicians should consult product labeling and reduce total daily dosage to account for incomplete opioid cross-tolerance. Clinicians should use additional caution with ER/LA opioids and consider a longer dosing interval when prescribing to patients with renal or hepatic dysfunction because decreased clearance of medications among these patients can lead to accumulation of medications to toxic levels and persistence in the body for longer durations. Although in certain situations clinicians might need to prescribe immediate-release and ER/LA opioids together (e.g., when transitioning patients from ER/LA opioids to immediate-release opioids by temporarily using lower dosages of both, for temporary postoperative use of short-term opioids in a patient already receiving ER/LA opioids, or in patients with opioid use disorder treated and stabilized on methadone who need short-acting opioids for acute pain), clinicians should consider the potential for increased overdose risk and use caution when prescribing immediate-release opioids in combination with ER/LA opioids.
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