Leptospirosis comes from the urine of infected animals, with rats being the usual culprit.
What happens is that flood waters come in contact with infected urine, contaminating it. When people wade in contaminated water, the leptospirosis bacteria causes an infection.
So the best way to prevent leptospirosis would be to try and avoid being in contact with floodwaters as much as possible.
Wearing boots in flood waters is also a good idea if you can’t avoid it.
You should also keep your surroundings as clean as possible, and drain any possible contaminated sources of water.
Dengue and Typhoid fever
Wearing long-sleeved shirts and pants can help prevent mosquito bites. Using anti-mosquito lotions are also a good idea, as well as using mosquito nets when sleeping.
However, the best way to deal with mosquitoes would be to deal with their breeding grounds. This means disposing of any stagnant water, since this is where mosquitoes lay their eggs.
Fumigation also works when it comes to killing off any mosquitoes in your home.
Similar to leptospirosis, cholera is also a water-borne disease. People usually get cholera if they drink water that has been contaminated with feces.
During the rainy season, this can happen as flood waters can sometimes mix with wastewater such as sewage, and contaminates sources of drinking water. If a person drinks this water, then they can get seriously sick from cholera.
The best way to deal with cholera would be to make sure that the water you are drinking is safe and uncontaminated. If you are unsure, it would be best to boil your drinking water for two or more minutes. This helps kill off any bacteria that might be in the water.