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Hands university student holding pen writing /calculator doing examination / study or quiz, test from teacher or in large lecture room, students in uniform attending exam classroom educational school.
Young scientists conducting research investigations in a medical laboratory, a researcher in the foreground is using a microscope
Female medical staff worker wearing protective equipment takes sample from nose of a patient to antigen test for coronavirus.
Nasal coronavirus PCR test. Doctor using swab stick to take covid virus specimen from potentially infected young guy at home. Viral disease prevention and diagnostics concept
Doctor show rapid laboratory COVID-19 test for diagnosis new Corona virus infection(novel corona virus disease 2019 or COVID)from Wuhan, ready for screening and treatment. Pandemic infectious concept

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