pathogen
Maybe
it is a good microbe
yeast
microbe
yeast
Micro-organism
Salmonella is considered a pathogenic (bad) microbe because it can cause food poisoning and infections in humans. It is commonly associated with contaminated food, and can lead to symptoms such as diarrhea, fever, and abdominal cramps.
It depends on the microbe. Some can not and others become 'dormant'.
Pathogen or disease-causing agent
The accepted phobia name for this condition is Bacillophobia. microbiophobia
Methicillin-resistant Staphylococcus aureus
The most common name for harmful microbes is germs.