This reseach was initiated to study the eating habits of househods living in a context of malnutrition in the Miti-Murhesa heath zone, with the aim of contributing to the improvement of eating habits. To achieve this, three Heath areas were chosen. The households are those with at least one member suffering from severe acute malnutrition was being treated in a severe acute malnutrition management program (are cases), their direct neighbors without a story of malnutrition were selected as controls. A survey questionnaire was admimistered to mothers (preferably). The results show that illiterale fathers are numerous among the cases, 47 compared 22 among the controls. The control households have more properly than the cases (p=0,00154) and are also the control households which have a higher monthly income than the cases (p=0,00191). Most foods were consumed more in the control group than in the cases and frequency of meals was also lower for cases than their controls. There is thus a positive association between the socio-economic level of households and food consuption.

This study aimed to improve solar water disinfection through the use of photosensitizing substances (coumarin extracts of Citrus reticulata, Citrus aurantium and Citrus maxima). Solar disinfection shows negligible inhibition of fecal coliforms after 60 minutes of exposition to the sunlight. On the other hand, for photodynamic disinfection, complete inhibition is noted after 60 minutes of exposition. Regarding fecal enterococci, negligible inhibition is noted after 30 minutes for solar disinfection. On the other hand, for all coumarin extracts (Citrus reticulata, Citrus aurantium and Citrus maxima), complete inhibition is noted after 30 minutes of exposition to the sunlight. These results show that the use of coumarin extracts of Citrus reticulata, Citrus aurantium and Citrus maxima significantly improves solar disinfection. Additionally, these results show that fecal enterococci are more sensitive to photodynamic disinfection than fecal coliforms. This difference in sensitivity is due to the constitution of their cell walls. The wall of fecal coliforms (Gram-) is rich in lipopolysaccharides. These constitute a barrier to the passage of singlet oxygen. Whereas, the wall of fecal enterococci (Gram+) is easily penetrated by singlet oxygen (1O2) because it lacks lipopolysaccharides. After its passage, singlet oxygen destroys cellular constituents. This leads to the death of the bacterial cell.