• Specific preventive interventions for malaria must be based on an informed assessment of the local situation, including on the prevalent parasite species and the main vectors.
• An increase in mosquito numbers may be delayed following flooding, allowing time for implementation of preventive measures such as indoor residual spraying of insecticides, or the re-treatment/distribution of insecticide-treated nets preferably long-lasting insecticidal nets (LLIN) in areas where their use is wellknown and accepted.
• Early detection of a possible malaria outbreak can be enhanced by monitoring weekly case numbers must be part of the surveillance/early warning system.
Periodic laboratory confirmation of rapid test-positive fever cases is recommended to track the slide/test positivity rate.
• Treatment with artemisinin-based combination (ACT) therapy should be provided free of charge to the user in disaster-affected areas with falciparum malaria. An active search for fever cases may be necessary to reduce mortality.
• For dengue, the main preventive efforts should be directed towards vector control.
Social mobilization and health education of the community should emphasize elimination of vector breeding sites as much as possible, specifically by:
- continuous covering of all stored water containers;
- removal or destruction of solid debris where water can collect (bottles, tyres, tins, etc.).