Microbes, namely Bacteria, Viruses & Fungi have a very close connection with the human body. Half of human DNA originates from viruses that infected and embedded their nucleic acid in our ancestors’ egg & sperm cells, experts say. What does the human body have more than it has human cells? Bacterial cells. Yes, with 10 times more in number, the presence of bacterial cells blurs the line between the existence of microbes and humans. A vast majority of microbes persist as “colonists” that can thrive in complex surroundings inside and outside of our bodies. The innate nature of these microbes is to multiply, which they do mostly without harming the human body unless there are some changes in natural interaction between microbes and humans.
The reasons that affect the normalcy are:
Travelling to new surroundings
Consuming contaminated food & water
Close contact with an infected person(s)
Airborne droplet transmission
Getting bit by disease-transmitting vectors- fleas, mites, ticks, rats, snails & dogs.