Our bodies are covered with germs and unless we get a breakdown in our skin's defense system they do what ever they are designed to do and no harm comes to us the organism. Man in his infinite ego, although I suspect that Strep and Pseudomonas aeruginosa have equally high regard for themselves, thinks he is here on this planet for some higher purpose; a creation of some higher power for some grandiose purpose. Perhaps that is true but I suspect that we are just one of many cogs in the universe's wheel.
In essence I'm inclined to believe that we, mankind, are but a germ on the entity we call earth and the earth is a germ in the wider cosmos of the universe and so on up the line. Everything has a purpose and when the defenses are breached catastrophe is in the making; think strep infection, psuedomonas blood poisoning etc., etc..
That's it. Extrapolation only brings me back to the same conclusions.