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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/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/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/1392377526/video/a-close-up-of-oak-tree-catkins-and-pollen-grains-covering-the-top-of-a-trash-can-being-blown.jpg?b=1&s=640x640&k=20&c=X7oaejAxo58lbZUYQ2fBavJtluR_fDkuJbfke_Kctow=)
A close up of oak tree catkins and pollen grains covering the top of a trash can being blown around by the breeze.
![](https://media.istockphoto.com/id/1333342960/video/young-asian-woman-using-rapid-antigen-test-kit-by-nasal-swab-herself-for-takes-a-sample-of.jpg?b=1&s=640x640&k=20&c=hjrMdCYIHGwwDX1a_SFrdnkKSre7Ku0R_B_afIi2ZxU=)
Young Asian woman using rapid antigen test kit by nasal swab herself for takes a sample of cells from the nasopharynx.
![](https://media.istockphoto.com/id/1364139831/video/4k-close-up-asian-mans-hands-use-a-rapid-antigen-test-kit-to-self-test-the-covid-19-at-home-a.jpg?b=1&s=640x640&k=20&c=UNSOJnuEQKZLOx4nJzaOXAd4p-_x2C8QlsI-mYaeeFM=)
4K, Close Up Asian man's hands use a rapid antigen test kit to self-test the COVID-19 at home. A long cotton swab is inserted into the nose and internal nasal fluid sample for COVID-19 testing.
![](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/1222119362/video/medical-research-of-antibodies-to-covid-19-scientific-workers-are-operating-microscopes-in.jpg?b=1&s=640x640&k=20&c=zgAwqpak5kjV0T6SiyWbFERu1DdH5bi1A6vuJNAS3EA=)
Medical research of antibodies to COVID-19. Scientific workers are operating microscopes in the laboratory
![](https://media.istockphoto.com/id/1363706293/video/little-girl-on-the-street-wearing-a-white-mask-looking-and-teaching-a-negative-antigen-test.jpg?b=1&s=640x640&k=20&c=YcUqBQBMU0WqoKzD1mfZzxg1JZYqFsrRi4HD7nzVNkE=)
Little girl on the street, wearing a white mask, looking and teaching a negative antigen test. Covid-19, ihu, delta, omicron, screening test and pandemic concept.
![](https://media.istockphoto.com/id/1363705618/video/little-girl-in-the-street-wearing-a-white-mask-holding-and-teaching-a-negative-antigen-test.jpg?b=1&s=640x640&k=20&c=GVYvaKcDsTMnbitOMfZcNOOX6eeg3_AChXs9ljZuzx4=)
Little girl in the street, wearing a white mask, holding and teaching a negative antigen test. Covid-19, ihu, delta, omicron, screening test and pandemic concept.