Passage: The floodwaters from the hurricane combined with raw sewage in many poor areas of southwestern Mexico, leading to a widespread threat for a spread of tropical diseases. As a result, government health workers opened vaccination centers in several cities along the Guerrero and Oaxaca coasts. Thousands were inoculated for typhoid fever and tetanus. Officials noted a potential threat for dengue and cholera as a result of the spoiled water. Health workers also stated mosquitos possessing malaria and dengue fever were likely to breed in large areas of leftover water. In Acapulco, about two days after the hurricane passed, the first day of sun in a week evaporated the areas of leftover water, spreading dust across the region with the deadly diseases. Residents were warned to boil their food and water for 30 minutes due to the threat for contamination by the dust. At least twenty cases of cholera and at least six cases of dengue fever were reported. Most significantly, there were 14,630 cases of malaria in 616 villages in Oaxaca due to Pauline; this represented about 80% of the malaria cases in Mexico during 1998. Army soldiers distributed chlorine tablets to disinfect water pools and wheelbarrows to remove rotting mud and sewage from their damaged homes. Two C-130 Hercules planes and twenty helicopters airlifted food and water to smaller villages south of Acapulco that were stranded for nearly a week after the hurricane.

Question: What are possible threats that come with spoiled water?
dengue and cholera