Majority of microbes are harmless. In fact, some of these help body systems function well. However, there are those that can make people sick and these are called pathogens.
Bacteria, viruses and germs are some of the pathogens that bring diseases to their hosts. An example is the Severe Acute Respiratory Syndrome Coronavirus 2 also known as SARS-CoV-2, a highly transmissible and pathogenic coronavirus responsible for Covid-19.