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WA 40 Houston - Odber krvi pacientky do skúmavky na testovanie protilátok na ochorenie COVID-19 v laboratóriu v americkom Houstone v utorok 28. apríla 2020. FOTO TASR/AP  

WAA Phlebotomist draws blood from a patient for COVID-19 antibody testing at Principle Health Systems and SynerGene Laboratory Tuesday, April 28, 2020, in Houston. The company, which opened two new testing sites Tuesday, is now offering a new COVID-19 antibody test developed by Abbott Laboratories. (AP Photo/David J. Phillip)