Molecular diagnosis is a great advantage in which you can detect the disease in time before it spreads to the whole body. Initially blood test, urine test, serum test was the conventional methods to detect the infection through virus, bacteria they are very less and small, due to which they are not detected with conventional method. Molecular diagnostics detect the presence of genetic material or proteins associated with specific health disease, even when they are present in very small number or non - symptomatic. The advanced diagnostic techniaues like recombinant DNA, ELISA, PCR used to check the early symptoms.