1500 www.thelancet.com Vol 373 May 2, 2009 A disadvantage of early vaccination in infancy can be reduced immunogenicity because of acquired immune responses that are less mature, and interference from maternal antibodies. However, newer vaccines supported for potential introduction into some developing countries pose safety as well as effi cacy questions about timing. More than 30% of children ...

An [18, 9, 8] extremal self-dual code over GF( 4 ) and related [17, 4, 12], [17, 8, 8],[17, 9, 7], [17, 13, 4] codes are investigated. Simple coordinates are given for these codes,and their minimal weight codewords and automorphism groups are determined. Thegroups are all isomorphic to 3 × (PSL 2 ( 16 ). 4 ). __________* This appeared in ‘‘Discrete Math.’’, vol. 83 (1990), pp. 2...

Background: The potentially destructive polarisation between 'vertical' financing (aiming for disease-specific results) and 'horizontal' financing (aiming for improved health systems) of health services in developing countries has found its way to the pages of Foreign Affairs and the Financial Times. The opportunity offered by 'diagonal' financing (aiming for disease-specific results through im...