This month's cover shows a doctor working in the Democratic Republic of the Congo. It illustrates health service delivery, one of the six building blocks of health systems (see box below).

In an editorial, Edmund Ramsden (82) discusses John B Calhoun's classic research into the association between population density and social pathology in rodents and humans. In a second editorial, Cesar G Victora et al. (83) call for a common approach to measuring the success of child survival programmes. Shankar Prinja & Rajesh Kumar (84), in our third editorial, ask whether the world can reduce major health inequalities within one generation.

We interview Dhiman Barua & Dilip Mahalanabis (91-92), whose work changed the world's approach to saving the lives of cholera patients.


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Conducting trachoma surveys

Jeremiah Ngondi et al. (143-151) highlight cluster random sampling as the best method for conducting trachoma surveys.


Plagues of poverty

Hermann Feldmeier & Jorg Heukelbach (152-159) advocate integrating the control of epidermal parasitic skin diseases with that of other neglected diseases.

In recognition of WHO's drive to revitalize primary health care, each month's cover of the Bulletin this year will feature a photo illustrating one of the six building blocks of health systems:

• Service delivery

• Health workforce

• Health information systems

• Medical products and technologies

• Financing systems

• Leadership and governance.

World Health Organization Genebra - Genebra - Switzerland