Answer: There are some parasitic and fungal infections that can be transmitted from cats to humans: roundworms, toxoplasma and ringworm (a fungal infection). Rabies may also be transmitted from cats to humans.
Answer: The most common thing that people can catch from guinea pigs is ringworm. Not to say that all guinea pigs have ringworm, but if your guinea pig has ringworm it is possible to transmit it to you.
Answer: It is an organism http://wiki.answers.com/wiki/Bacillus_anthracis. that is a bacteria that produces spores that can infect you directly or you can get it from eating the meat of infected animals that has the spores in it. If untreated, you die of toxemia.
Answer: Poliomyelitis, often called polio or infantile paralysis, is an acute viral infectious disease spread from person to person, primarily via the fecal-oral route. Therefore it is extremely important to wash your hands after using the toilet.
Answer: You can get sick from swimming in polluted water. This is why swimming pools have chlorine in their water. It is save, theoretically, to swim in an unpolluted pond or lake, but the water should be tested because it is not possible actually to know the water is safe otherwise.