Viral disease tests are designed to detect infections caused by viruses of different shapes and sizes. These pathogens are non-cellular organisms that can only spread and multiply in living cells. Effective detection and treatment of viral diseases requires laboratory tests that detect specific antibodies or viral genetic material in the blood. These tests help to diagnose the disease accurately, to start treatment in time and to avoid mistakes in treatment decisions, as the symptoms of viral diseases are often similar to those of other infections.