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Coronavirus testing. The doctor holds in her hand a test tube with a blood sample with a negative result. Close-up. Selective focus.

Scientist laboratory protection glasses test tube coronavirus blood gray background.

Coronavirus testing. A nurse holds in her hand a test tube with a blood sample with a positive result. Close-up. Selective focus.

Selective focus of scientist in hazmat suit holding test tube isolated on grey

Cropped view of young scientist adding liquid with pipette to one of several test tubes

Beautiful scientist looking at red liquid in test tube and writing down results

Partial view of scientist adding red liquid to one of several test tubes in laboratory

Attentive scientist looking at red liquid in test tube in clinical laboratory

Cropped view of person holding syringe and bottle with vaccine isolated on grey