Yes, there are many types of bacteria, some good, some benign and some bad. Different types of bacteria are everywhere, each supposed to be in it's own proper place. The bacteria a cat would ingest from normal grooming after being in normal environmental situation would not be bad for the cats. Any bacteria on live bugs would not be a problem. Fresh killed bugs are a goood snack for cats (provided it's not a roach who just ate roach poison). E-coli originate in the intestinal tract, then gets on the solid waste. E-coli in human waste is bad to ingest. Humans and animals have gotten ill from food or water contaminated with feces, whether it was e-coli or some other fecal bacteria. There are other organisms in fecal matter that is not to be ingested, such as giardia, which mammals can get from drinking water contaminated with it. Cats get it too. see http://www.vetcentric.com/userportal...e=EncycIllness
"Giardia is a parasite found in the intestines of humans and most types of domesticated animals throughout the world, including cats. It is also a common cause of diarrhea in cats, especially among cats in catteries and group housing situations....Transmission occurs when the cat swallows the Giardia cysts that are found in the feces of an infected animal, or in contaminated food or water sources. The cysts cause infection when swallowed by a cat." It is normal for people and cats to have a certain level of e-coli and giardia in their intestines, but they are not supposed to ingest them via their mouths to then pass into their stomachs. Natural amounts ok in intestines. Bad in stomachs.
When animals, such as cats and lions eat live prey, or already killed slabs of meat, they are eating the flesh part of the animal, not it's solid wastes product. There is a big difference. If the raw meat served to cats, or lions, was contaminated in the processing plant, or the food prep area, then they could get ill, and it has happened to zoo animals and household pets fed contaminated, raw meat. Not all meat is contaminated with e-coli or contaminated with anything at all, but some is. Fresh killed animals eaten immediately (such as a cat killing and eating a mouse)would not be a problem. Carniverous animals don't naturally drink from toilets contaminated with particles of human fecal matter and cleaning products. They don't drink much at all, as a matter of fact, getting their moisture from the blood of the animals they kill and eat. Cats don't eat already dead animals lying around decaying. They eat fresh killed animals. They don't eat human fecal matter.
Responsible zoos *do* keep meat at proper temperatures before feeding them to the animals. OH PLEASE, as you would say, where do you come up with your ideas that zoos "don't cook meat to a proper temperature" and that they feed partly cooked meat at all? Again, there is a difference between properly handled raw meat and contamination with fecal matter. Fecal matter is in toilets. It is not supposed to be ingested. Read about the great care taken in food prep and food serving to tigers at a zoo here= http://www.5tigers.org/Zoos/Husbandr...al/husman4.htm
Here is an except for your enlightenment:
"Food preparation and handling is an area of special concern. If the diet is mixed within the institutions, all ingredients should be scrupulously maintained free of contamination from chemicals, pests or microorganisms. Avoid allowing raw diets to warm to room temperature for long periods of time prior to feeding. The practice promotes the rapid growth of bacterial organisms. Frozen ingredients should be properly thawed to reduce bacterial growth and diets fed as soon as possible after mixing. Commercial diets are thawed under clean conditions, free from external contamination, and fed immediately after thawing. Some institutions actually feed the diet while still frozen allowing tigers to eat as it thaws."
Unless you keep in frequent touch with many vets or other animal health workers or zoo officials, getting detailed information, it's not likely you would know what various animals around the world and in different environments have become ill from or what they died from. It's not like vets report to the newpapers, and have it printed, every time one of their animal patients gets ill or dies, detailing the cause of death. Just because you never heard of something, does not mean it is not true or doesn't exist. Also, most people do not have autopsies done on their pets when they die, to detemine the exact cause of death, so even the vets wouldn't know for sure.
Toilet water is not good for any creature to drink due to the fecal contaminants plus traces of cleaning products in them.