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Bear in mind that a healthy human body has, by numeric count, far more non-human organisms living in it than it has cells alltogether.

But read this quote from wikipedia, ESPECIALLY THE LAST LINE!

"Toxoplasma gondii is a species of parasitic protozoa whose definitive host is cats but can also be carried by the vast majority of other warm-blooded animals including humans. It causes the disease toxoplasmosis which is usually minor and self-limiting but can have serious or even fatal effects, particularly in cats, or for a foetus when first contracted during pregnancy. It belongs to the Apicomplexa and is the only known member of the genus Toxoplasma.

Human prevalence

The U.S. NHANES (1999-2000) national probability sample found that 15.8% of U.S. persons above 12 years of age had Toxoplasma-specific IgG antibodies, indicating that they had been infected with the organism. This prevalence had not significantly changed from the 1988-1994 data.[4]

It is estimated that up to 50% of all people worldwide are infected with Toxoplasma gondii. The incidence of infection is highly specific to each nationality with ranges such as 22% infected in the UK to over 88% in France.[5]

Looking between the CIA Factbook population for France and the top ten country cat populations show that there would be roughly 1.3 cats for every man, woman, and child in that country.

If there are any personality or mental problems to be had, France is the place to study. The US, by comparison, has merely 1 cat for every four people.