Up until lately these diseases have not posed a huge threat, but with the increase of people with suppressed immune systems and diseases like AIDS, there are more people susceptible. Overall pets still pose a minimal problem but there are a few diseases to be aware of.
Some experts believe that almost every puppy and kitten is infected with worms.
Worm eggs can also be shed in the feces. Infections can be carried in the animals body tissues for months or years. This can reinfect other neighborhood animals.