Measles virus: is a single-stranded, negative-sense, ribonucleic acid (RNA) virus from the Paramyxoviridae family and Morbillivirus genus. The viral RNA genome lies in a nucleocapsid covered by a protein envelope, and encodes six structural proteins: hemagglutinin (H), fusion (F), matrix (M), phosphoprotein (P), large (L), and nucleoprotein (N).26 H and F proteins are components of the outer viral envelope, while M protein lines its internal surface. Proteins P, L and N lie inside the