BCG vaccination of infants appear to offer significant protection from primary and disseminated tuberculosis including meningitis. In older children it doesn&;t seem to offer protection against secondary tuberculosis. It is generally recommended that peussis vaccine should not be given to children over 5-6 years old. The final dose in IPV series (Salk) should be administered on or after the fouh bihday and atleast 6 months following the previous dose. Reference: Nelson textbook of pediatrics 19th edition Page 888