RESUMO
When stay-at-home orders were issued to slow the spread of COVID-19, building occupancy (and water demand) was drastically decreased in many buildings. There was concern that widespread low water demand may cause unprecedented Legionella occurrence and Legionnaires' disease incidence. In lieu of evidenced-based guidance, many people flushed their water systems as a preventative measure, using highly variable practices. Here, we present field-scale research from a building before, during, and after periods of low occupancy, and controlled stagnation experiments. We document no change, a > 4-log increase, and a > 1.5-log decrease of L. pneumophila during 3- to 7-week periods of low water demand. L. pneumophila increased by > 1-log after precautionary flushing prior to reoccupancy, which was repeated in controlled boiler flushing experiments. These results demonstrate that the impact of low water demand (colloquially called stagnation) is not as straight forward as is generally assumed, and that some flushing practices have potential unintended consequences. In particular, stagnation must be considered in context with other Legionella growth factors like temperature and flow profiles. Boiler flushing practices that dramatically increase the flow rate and rapidly deplete boiler temperature may mobilize Legionella present in biofilms and sediment.
RESUMO
OBJECTIVES: Osteoarthritis (OA) of the knee is one of the most common chronic diseases among older adults. This study aimed to test the effects of cabbage leaf wraps (CLWs) in the treatment of symptomatic OA. METHODS: Patients with OA of the knee at stages II to III (Kellgren-Lawrence) were randomly assigned to 4 weeks of treatment with CLWs (daily for at least 2h), topical pain gel (TPG) (10 mg diclofenac/g, at least once daily), or usual care (UC). The primary outcome measure was pain intensity (VAS) after 4 weeks. Secondary outcomes included functional disability Western Ontario and McMaster Universities Arthritis Index (WOMAC), quality of life (SF-36), self-efficacy (Arthritis Self-Efficacy Scale-D), physical function (30 s Chair Stand Test), pressure pain sensitivity (PPT), satisfaction, and safety after 4 and 12 weeks. RESULTS: In total, 81 patients were included in this study (42 women, 65.9±10.3 y). After 4 weeks patients in the CLW group reported significantly less pain compared with those in the UC group (difference, -12.1; 95% [confidence interval] CI, -23.1, -1.0; P=0.033) but not when compared with the TPG group (difference, -8.6; 95% CI, -21.5, 4.4; P=0.190). Significant effects were also found in WOMAC, SF-36, 30-second Chair Stand Test, and PPT scores in the CLW group compared with the UC group. Compared with TPG, effects from CLW were found for WOMAC after 4 weeks and for quality of life after 12 weeks. Patients were satisfied with both active interventions, and except for 2 adverse events in both groups the applications were well tolerated. CONCLUSIONS: CLWs are more effective for knee OA than UC, but not compared with diclofenac gel. Therefore, they might be recommended for patients with OA of the knee. Further research is warranted.
