A year of genomic surveillance reveals how the SARS-CoV-2 pandemic unfolded in Africa

The progression of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic in Africa has so far been heterogeneous, and the full impact is not yet well understood. In this study, we describe the genomic epidemiology using a dataset of 8746 genomes from 33 African countries and two overseas territories. We show that the epidemics in most countries were initiated by importations predominantly from Europe, which diminished after the early introduction of international travel restrictions. As the pandemic progressed, ongoing transmission in many countries and increasing mobility led to the emergence and spread within the continent of many variants of concern and interest, such as B.1.351, B.1.525, A.23.1, and C.1.1. Although distorted by low sampling numbers and blind spots, the findings highlight that Africa must not be left behind in the global pandemic response, otherwise it could become a source for new variants.

Multiple Early Introductions of SARS-CoV-2 to Cape Town, South Africa

Cape Town was the first city in South Africa to experience the full impact of the coronavirus disease 2019 (COVID-19) pandemic. We acquired samples from all suspected cases and their contacts during the first month of the pandemic from Tygerberg Hospital. Nanopore sequencing generated SARS-CoV-2 whole genomes. Phylogenetic inference with maximum likelihood and Bayesian methods were used to determine lineages that seeded the local epidemic. Three patients were known to have travelled internationally and an outbreak was detected in a nearby supermarket. Sequencing of 50 samples produced 46 high-quality genomes. The sequences were classified as lineages: B, B.1, B.1.1.1, B.1.1.161, B.1.1.29, B.1.8, B.39, and B.40. All the sequences from persons under investigation (PUIs) in the supermarket outbreak (lineage B.1.8) fall within a clade from the Netherlands with good support (p > 0.9). In addition, a new mutation, 5209A>G, emerged within the Cape Town cluster. The molecular clock analysis suggests that this occurred around 13 March 2020 (95% confidence interval: 9-17 March). The phylogenetic reconstruction suggests at least nine early introductions of SARS-CoV-2 into Cape Town and an early localized transmission in a shopping environment. Genomic surveillance was successfully used to investigate and track the spread of early introductions of SARS-CoV-2 in Cape Town.

Changes of urodynamic findings after radical retropubic prostatectomy

OBJECTIVES

We wanted to evaluate the urodynamic changes of radical retropubic prostatectomy in patients with localized prostate cancer and identify specific factors that could influence the postoperative continence status.

METHODS

Sixty-six consecutive patients (mean age 68 years) were studied urodynamically within 1 week before surgery, and 44 of them at a mean 7.6 months after radical intervention.

RESULTS

Complete urinary continence was achieved in 37/44 men (84. 1%) after 6 months and in 43/44 patients (97.7%) 1 year after surgery. Stress incontinence of varying degree improved with time. Seven patients demonstrated a moderate incontinence 4 months after radical prostatectomy and 1/7 was still incontinent after 1 year. Mean flow rate, maximum detrusor pressure, maximum urethral closure pressure (at rest and voluntary contraction of the sphincter) and functional urethral length showed significant changes after surgery. Detrusor instability, which was present in 31.8% of the 66 patients preoperatively, was not responsible for any case of postoperative incontinence. The urethral pressure profile was significantly reduced in all patients after surgery.

CONCLUSIONS

The present study indicates that there are no preoperative alterations in bladder function such as detrusor instability to identify patients at risk for postoperative incontinence. Postoperative incontinence seems to depend upon sphincteric deficiency as expressed by the reduced pressures in the sphincteric mechanism.