It’s intriguing to consider why there’s a fear of “microbes” or “bacteria” when at least half of our cells are bacterial, with other microbes making up some of the rest. This apprehension likely stems from the “Germ Theory,” a significant scientific breakthrough. Around 150 years ago, in the late 19th century, Louis Pasteur discovered the relationship between bacteria and the spoilage of beer, thus linking microorganisms with spoilage and disease. Following this, Robert Koch demonstrated that certain “germs” could cause specific diseases. This revelation sparked a public health movement in the late 19th and 20th centuries, profoundly impacting both public and private hygiene practices. The spread of knowledge about microorganisms and disease led to a societal duty to prevent sickness.

Now, a century and a half later, this understanding is deeply rooted, yet it’s worth pondering whether our responses are overblown. Has the dread of sickness and disease outbreaks resulted in a phobia of all microbes, including the trillions that are essential for our survival and well-being? In recent years, especially with advances in human microbiome research, there has been an increase in public recognition of “beneficial microbes.” Nonetheless, much work remains in fostering a balanced comprehension of Germ Theory and the Human Microbiome and their interactions.