People that get it have watery diarrhea, fever, and a stomach ache. Giardia is known as the monkey-faced protozoan. These little guys with whip-like tails cause diarrhea and weight loss in pets and people. Giardia is spread through contaminated water and by contact with fecal material. There are now reliable tests and drugs, as well as a new vaccine for pets.
Leptospirosis is a corkscrew shaped bacteria.
Lepto is spread in urine. This urine may infect the soil and water. Lepto prefers warm tropical parts of the world. Cattle lepto is much more common than the dog type. This disease has been greatly reduced through vaccination programs.