Effect of chronic hydroxychloroquine use on COVID-19 risk in patients with rheumatoid arthritis and systemic lupus erythematosus: a multicenter retrospective cohort.

Objective: Hydroxychloroquine (HCQ) has been used during the coronavirus disease 2019 (COVID-19) pandemic because of its reported anti-viral activity. This study examined the association of chronic HCQ use with the incidence and complications of COVID-19.

Methods: This retrospective cohort study included adults with rheumatoid arthritis and/or systemic lupus erythematosus who visited rheumatology clinics in three tertiary hospitals in Riyadh, Saudi Arabia between January 2019 and December 2020.

Clinical and demographic characteristics of patients with coronavirus disease 2019 in Security Forces Hospital, Riyadh, Saudi Arabia.

Background: Corona virus disease (COVID-19) is a global pandemic public health problem which affected more than 5 million worldwide and caused more than 500,000 deaths. Disease presentations varied from a symptomatic or mild to severe illness which leads to death.

Aim: The study describes the demographic and clinical characteristics patients with coronavirus disease 2019 (COVID-19) admitted to Security Forces Hospital in Riyadh, Saudi Arabia between 15 March till 30 of June 2020.

Does COVID-19 antibody serology testing correlate with disease severity? An analytical descriptive retrospective study.

Aim: To find out if there is any correlation between COVID-19 antibody serological testing and symptom severity.

Methods: This study is a case series of 44 consecutive patients confirmed with COVID-19 who are divided into a group of 23 patients with mild disease and a group of 21 patients with severe disease. All 44 samples were confirmed positive SARS-CoV-2.