Measles, Mumps, Rubella and Varicella are common child diseases that spread by airborne transmission of droplets from the respiratory tract. Among them, Varicella is caused by contact with vesicle fluids of the skin lesions. The disease may be complicated by encephalitis, or even fatal in severe cases. Young children should receive the first dose of MMRV Priorix-Tetra Vaccine at one year of age, followed by the second dose at 15 months to 6 years. Moreover, the side effects of the vaccine are mild.