Abbassy, A.A. Barakat, S.S. Abdel Fattah, M.M. Said, Z.N. El Metwally, H.A. 2009 This cross sectional study evaluated the immune status of non vaccinated healthy infants to determine if it is possible to replace both measles vaccine at 9 months and measles, mumps and rubella MMR vaccine at 18 months with a single dose of MMR at 12 months. Serum samples from 566 children in Alexandria, Egypt showed a significant decrease in the seropositive rate to the 3 viral diseases with increasing age, but a significant increase in the seropositive rate among infants who were ranked 1st or 2nd in their family, full term or born to ...