Measles virus and rubella virus (MeV/RuV)

Measles virus (MeV) and Rubella virus (RuV) are distinct human pathogens often grouped together due to their inclusion in the trivalent MMR vaccine [3]. Measles virus is a highly contagious, negative-sense RNA virus of the Paramyxoviridae family that causes a systemic infection characterized by high fever, respiratory symptoms, and a characteristic maculopapular rash [1, 4]. It is known for causing temporary but severe immunosuppression and can lead to fatal complications such as pneumonia or the delayed neurological disorder subacute sclerosing panencephalitis (SSPE) [4, 6]. Rubella virus is a positive-sense RNA virus of the Matonaviridae family that typically causes a mild febrile illness known as German measles [2, 5]. However, its primary clinical significance lies in its potent teratogenicity; infection during early pregnancy can lead to Congenital Rubella Syndrome (CRS), resulting in severe birth defects, deafness, and cardiac abnormalities [2, 5]. Both viruses are primarily managed through widespread vaccination programs using live-attenuated strains, which have significantly reduced global incidence, though outbreaks persist in under-vaccinated populations [1, 3].

Other names

MeV and RuVRubeola and German measlesMMR componentsMorbillivirus and Rubivirus

The MMR vaccine utilizes live-attenuated strains of Measles (Edmonston-Enders strain) and Rubella (Wistar RA 27/3 strain) to stimulate the production of neutralizing antibodies and activate cellular immunity [3]. Vitamin A acts as an immunomodulator and essential cofactor for epithelial integrity, reducing measles-related morbidity and mortality [1]. Ribavirin acts as a guanosine analog that interferes with viral RNA synthesis by inhibiting the viral RNA-dependent RNA polymerase [4].