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A household is defined as any group of people living together, sharing the same economy and recognizing the same household head.
Some people, generally polygamous men, are heads of more than one household but are registered as residents of only one.
For Caxito, capital of the province and the most populated commune of the study area, those ratios are 66, respectively.
The HDSS covers households and residents of the described surveillance area.
CISA´s general objectives are: to conduct epidemiological research on the most prevalent diseases affecting the country’s population, and its risk factors; to promote the integration of Angolan health professionals in national and international research projects; and to provide learning opportunities in its several research areas for national health professionals, graduate students and researchers.
The centre is a collaboration between the Angolan Ministry of Health, the Portuguese Institute of Language and Development and Calouste Gulbenkian Foundation.
Therefore, the Dande HDSS was implemented in August 2009 in the Dande municipality, to provide a platform for population-based research on the main causes of morbidity and to allow planning of contextualized health interventions.
The initial census, performed between August 2009 and March 2010, established the baseline population (15 579 households with 59 635 residents).
The HDSS area is located in the Dande municipality in the Bengo province, about 60 km north-east of Luanda.
The study area, of approximately 4 700 km, covers all neighbourhoods located in three of the five communes of the municipality–Caxito, Mabubas and Úcua–and a smaller portion of neighbourhoods in the Barra do Dande and Kicabo communes (Figure 1).
A person´s follow-up ends within the HDSS when he/she migrates outside the study area.