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![](https://media.istockphoto.com/id/1221226197/video/antibodies-block-a-virus-from-entering-a-body-cell-immune-system-defends-the-body-against.jpg?b=1&s=640x640&k=20&c=z81NQ0b0e1Bx9rexjIr8o2qdb8VrQjL4PoGR2yd_6-M=)
Antibodies block a virus from entering a body cell, Immune system defends the body against infections and diseases
![](https://media.istockphoto.com/id/1352056660/video/pcr-test-in-the-laboratory-the-doctor-looks-at-the-sample-taken-to-collect-smears-for-covid.jpg?b=1&s=640x640&k=20&c=JRcrOO07l4x_4hvhxOabFGU-kpVB0ws2AlTjox9NXro=)
PCR test in the laboratory. The doctor looks at the sample taken to collect smears for COVID-19. A laboratory worker in a medical suit, mask, gloves, holds a test tube with an OP NP sample taken.
![](https://media.istockphoto.com/id/1307547589/video/coronavirus-testing-methods-rapid-covid-19-test-in-modern-laboratory-showing-positive-result.jpg?b=1&s=640x640&k=20&c=78L95pZMiC2vKFP1b7agqKmRIN51--16qugOFynMSdg=)
Coronavirus testing methods. Rapid covid-19 test in modern laboratory showing positive result. Diagnostic devices in progress. Quick results for virus detection. Healthcare concept
![](https://media.istockphoto.com/id/1398844020/video/blue-virus-on-blue-background-coronavirus-covid-19-viral-infection-concept-3d-4k-video.jpg?b=1&s=640x640&k=20&c=s6xRHblhRRBlkso2AnxbqERN9otmNM8Jgl0f-XqOyHQ=)
Blue Virus On Blue Background. Coronavirus Covid-19, Viral Infection Concept. 3D 4K Video.
![](https://media.istockphoto.com/id/1392374138/video/oak-catkin-pollen-bearers-cylindrical-flower-clusters-blowing-across-a-driveway-to-the-lawn.jpg?b=1&s=640x640&k=20&c=tXYv74ZWkUy2R3MJ-qi9SeM1EcK423xdl2Uv4FqN2Kc=)
Oak catkin pollen bearers cylindrical flower clusters blowing across a driveway to the lawn.
![](https://media.istockphoto.com/id/1781953051/video/healthcare-worker-taking-a-sample-from-a-little-boys-nose-using-a-cotton-swab-in-front-of.jpg?b=1&s=640x640&k=20&c=yKmoAl8vEGU3BMsvSs4Vyiz0fdRHKKMPEJpuKbw3saQ=)
Healthcare worker taking a sample from a little boy's nose using a cotton swab in front of school.
![](https://media.istockphoto.com/id/1765490469/video/role-of-immunoglobulin-antibodies-complex-protein-in-human-body-with-clinic-visit-animated.jpg?b=1&s=640x640&k=20&c=fhfutbX5cTdPsL0R1xR_3vutouaDWw8gyYXFdUWGW14=)
Role of Immunoglobulin - Antibodies - Complex Protein in Human Body with clinic visit - Animated Icon