Housefly does not cause cholera. But they spread the same. Housefly sits on the stool of cholera patient and then on your food. It directly transfer the millions of bacteria to you form the stool of cholera patient. This way housefly transfer many other fecal oral diseases to you. You need to see the leg of housefly under light microscope.
Chlorine does not cause cholera. You may get cholera, by absence of that little chlorine in public water supply.
Cholera
Cholera can not cause pandemic today, unless there is some natural calamity. There were cholera pandemic in past, due to lack of knowledge about cholera and lack of hygiene.
John Snow discovered cholera in 1852, from contaminated water.
Cholera spread by fecal oral route. That means cholera is there in he feces of the cholera patient in millions. It is mostly transmitted by contaminated water. House fly also play important role in the spread of cholera. Flies sit on the feces of the cholera patient and then on your food, to transfer the bacteria to you.
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YES
It proposed that cholera was caused/spread by bad vapours in the air.
Cholera is transmitted by fecal oral route. It is transmitted by contaminated water. It is also transmitted by contamination of food by flies and by contaminated hands.
Cholera bacteria does not invade your blood to cause septicemia. They normally stay in your intestine to give you profuse diarrhoea.
Cholera can be successfully treated with little problem in areas with good health care available, but in underdeveloped areas with little health care facilities, the death rate from cholera is extremely high