One type of rapid diagnostic test (RDT) detects the presence of viral proteins (antigens) expressed by the COVID-19 virus in a sample from the respiratory tract of a person...
Blood collection tubes, used to collect blood samples contain heparin which stabilizes the red blood cell membranes, are used for specialized hematology studies.
Whole blood is collected in blood col...
Here is a painting done in 1809 of a person dying of tetanus.
Painting done by his doctor. The position is called opistothonus.