ABSTRACT
This special issue contains 10 papers on the following topics: evaluating association between ABO blood groups and COVID 19;impact of COVID-19 on Libyan laboratory specialists;microscopic agglutination test for diagnosis of leptospirosis by using filter paper-dried serum samples;prevalence of haemoparasites among blood donors in Calabar, Nigeria;assessment of peripheral blood lymphocytosis in adults and determination of thresholds for differential diagnosis between clonal and reactive lymphocytosis;investigation of antibiotic resistance pattern in isolates from urine and blood samples of patients admitted to the Intensive Care Unit of Velayat Hospital in Qazvin, Iran;evaluation of rejection rates and reasons among specimens taken from different hospital units;quality tools to ensure patient safety and reduce the turnaround time of medical laboratories in tertiary care teaching hospitals;prevalence and antibiotic resistance pattern of Gram-positive isolates from burn patients in Velayat Burn Center in Rasht, North of Iran;and infective endocarditis caused by Staphylococcus aureus in a 6-year-old girl with no history of heart and dental problems.