We are born with parasites, not maggots.
Maggots are found on any decomposing body. They are found about everywhere.
If there are no flies then there will be no maggots. No flies, no eggs, no maggots.
Leeches are blood sucking parasites, they are normally found in body's of fresh water. Maggots are fly larvae they can be found in rotting food or carcases ( like a dead body, maggots can be found where flys have laid eggs), an example is maggots can found in cans of raw mushrooms.
Baby houseflies are called maggots. When flies are born they become larva and then they become maggots. The maggot will then eventually become a fly.
Houseflies are born from maggots.
Maggots can climb in search of a new source of food. They are only capable of travelling short distances due to their body design.
If there was absolutely no way for a maggot to get into the room, and no maggots or maggot eggs anywhere in the room or on your person, then there is no way for your body to become infested with maggots. Maggots are a living creature and they can't appear out of thin air, they have to come from somewhere.
No, it is not true.
The answer here must be yes. Without knowing why maggots would even be in a swimming pool, there should be sufficient disinfectant in the pool water to kill maggots or any other type of invaders. You wouldn't put your body in contact with maggots in any normal situation therefore swimming with maggots is putting your body in contact with the germs that are washed from them into the water. Do not swim in any polluted water is always the safest rule.
To stop a maggot from turning into a maggot you would have to kill it. To kill them without chemicals you can sprinkle the maggots with salt or cover them in a mixture of vinegar and water.