Among micro-organisms, parasites include viruses, bacteria and protozoa. Virology and bacteriology are separately defined disciplines, so the term parasitology is generally applied to nucleated unicellular and multicellular organisms.
Parasitic diseases remain a major problem in many parts of the world.
They thrive in poor social, political and economic conditions, and for the absence of vaccines and a severe shortage of affordable effective drugs. Molecular Parasitology is the study of parasites and their interactions with their hosts, at the molecular level. As in all of modern biology, we increasingly strive to understand the molecular mechanisms that enable organisms to survive, proliferate, and interfere with the health of their hosts. Genes encode the amino-acid sequence of proteins and proteins form the machinery that engineers the characteristics of individual cells and organisms. Using proteins, cells create carbohydrates , lipids and other complex molecules .