Effect of the exposure to Fasciola hepatica (Trematoda: Digenea) on life history traits of Lymnaea cousini and Lymnaea columella (Gastropoda: Lymnaeidae).

The snails Lymnaea columella and Lymnaea cousini have both been reported as intermediate hosts of Fasciola hepatica in Colombia. The effect of the exposure to the parasite on survival, fecundity and size of these snails was evaluated by means of experimental infections and the life history traits of control and exposed groups were compared. Infection rates were 82.2 and 34% for L. columella and L. cousini, respectively. A reduction in fitness was observed in both species when exposed to the parasite: fecundity alone was reduced in L. columella whereas in L. cousini there was also a decline in survival rate. Unlike other studies, increased size was not observed in either species. On the contrary, a reduction in growth rate was observed in L. columella.

[Does the lack of availability of information represent a bottleneck for research and evaluation in health policy?]. / Disponibilidad de información: un cuello de botella para investigación y evaluación en politicas de salud?

OBJECTIVES: This article describes the difficulties encountered in obtaining information about health services, sanitation and health insurance coverage supply, use and coverage regarding a sample of Colombian municipalities during 1991-2000. The availability of information is also analysed in terms of decentralisation and municipal development. METHOD: This was a cross-sectional study of a random stratified sample of 495 Colombian municipalities; information regarding the variables of interest was requested at municipal and departmental level and from national sources. A scale was constructed for measuring the availability of information at local level. Non-parametric statistics were used for testing differences in availability of information in terms of certification and municipal category. RESULTS: Applying the scale revealed 51% availability of data regarding health service supply, 39% for data regarding service use and 45% for both types of information (supply and demand taken together). No information was available in 32% of the municipalities. Information was more readily available in non-certified and less developed municipalities. CONCLUSIONS: Study findings provided indirect evidence of difficulty in obtaining information regarding health systems at both municipal and departmental levels; this represents an important obstacle for health system management and evaluating performance, as well as for research and widening knowledge (and availability to such knowledge) in this area.