COVID-19 Vaccination Perceptions in Patients With Rheumatic Disease: A Cross-Sectional Online Survey.

OBJECTIVE: To identify the factors that affect coronavirus disease 2019 (COVID-19) vaccine decision making among individuals diagnosed with a rheumatologic condition, given that previous international studies have demonstrated that a significant proportion of patients with rheumatic disease (RD) are vaccine hesitant. METHODS: This cross-sectional study involved an online survey with adult patients with RD from the Kaye Edmonton Clinic Rheumatology Clinic between June and August 2021. Quantitative results were descriptively analyzed, whereas qualitative thematic analysis was conducted for open-ended responses. RESULTS: The survey had a response rate of 70.9% (N = 231). Regarding COVID-19 vaccines, patients with RD were most concerned about the possible effect of vaccination on their rheumatic condition (45.2%) and about vaccine effectiveness (45.1%). Most patients had discussed COVID-19 vaccination (75.9%) and its risks and benefits (66.1%) with their medical team, and 83.6% of respondents were confident in the information provided. Patients' perceptions of the government's role in handling the COVID-19 pandemic varied: 33% reported that they found government-instituted public health measures effective. Surprisingly, 9.7% of patients with RD still reported concerns that they could develop COVID-19 from an approved COVID-19 vaccine. CONCLUSION: This study describes factors implicated in COVID-19 vaccine decision making among patients with RD. Three important themes included possible adverse effects of the vaccine on RD control, reduced vaccine efficacy because of RD/treatment, and risk of contracting SARS-CoV-2 from the COVID-19 vaccine. Knowledge from this study can assist healthcare providers in looking after patients with RD to initiate discussions with patients to share evidence-based vaccine information and assist with informed decision making.

Do COVID-19 Infections Result in a Different Form of Secondary Hemophagocytic Lymphohistiocytosis.

The coronavirus disease 2019 (COVID-19) pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has resulted in significant morbidity and mortality across the world, with no current effective treatments available. Recent studies suggest the possibility of a cytokine storm associated with severe COVID-19, similar to the biochemical profile seen in hemophagocytic lymphohistiocytosis (HLH), raising the question of possible benefits that could be derived from targeted immunosuppression in severe COVID-19 patients. We reviewed the literature regarding the diagnosis and features of HLH, particularly secondary HLH, and aimed to identify gaps in the literature to truly clarify the existence of a COVID-19 associated HLH. Diagnostic criteria such as HScore or HLH-2004 may have suboptimal performance in identifying COVID-19 HLH-like presentations, and criteria such as soluble CD163, NK cell activity, or other novel biomarkers may be more useful in identifying this entity.

COVID-19, rheumatic diseases and immune dysregulation-a perspective.

The COVID-19 pandemic has resulted in widespread hospitalisations and deaths around the world. As patients with rheumatic diseases generally have increased risk of infections and complications, understandably, there is significant concern of the impact of SARS-CoV-2 on these patients. However, there is a paucity of data in rheumatic patients. We review mechanisms through which SARS-CoV-2 results in infection, including ACE2 receptor, and complications (including immune dysregulation, thrombosis and complement activation). We assess these pathways in patients with rheumatic disease and those on immune modulating therapy. Although data thus far does not appear to show worse outcomes in rheumatic patients as a whole, given alterations in the underlying immune pathways in certain diseases (such as systemic lupus erythematosus), we posit that the risk is not equal in all rheumatic patients. We also discuss the benefit of underlying disease control with respect to COVID-19 risk reduction and potential increased risk of disease flares following viral infection from an immune standpoint.

Natural Killer Cell Dysfunction and Its Role in COVID-19.

When facing an acute viral infection, our immune systems need to function with finite precision to enable the elimination of the pathogen, whilst protecting our bodies from immune-related damage. In many instances however this "perfect balance" is not achieved, factors such as ageing, cancer, autoimmunity and cardiovascular disease all skew the immune response which is then further distorted by viral infection. In SARS-CoV-2, although the vast majority of COVID-19 cases are mild, as of 24 August 2020, over 800,000 people have died, many from the severe inflammatory cytokine release resulting in extreme clinical manifestations such as acute respiratory distress syndrome (ARDS) and hemophagocytic lymphohistiocytosis (HLH). Severe complications are more common in elderly patients and patients with cardiovascular diseases. Natural killer (NK) cells play a critical role in modulating the immune response and in both of these patient groups, NK cell effector functions are blunted. Preliminary studies in COVID-19 patients with severe disease suggests a reduction in NK cell number and function, resulting in decreased clearance of infected and activated cells, and unchecked elevation of tissue-damaging inflammation markers. SARS-CoV-2 infection skews the immune response towards an overwhelmingly inflammatory phenotype. Restoration of NK cell effector functions has the potential to correct the delicate immune balance required to effectively overcome SARS-CoV-2 infection.