A. and B., this is the life of most Bi Polar and Clinical depression
Microorganisms such as bacteria, viruses, yeasts and molds can spoil food and may cause a risk to anyone's health. Microbes cause infectious diseases such as flu and measles. But you do have to remember that less than 1% of bacteria can invade our body (the host) and make us ill. So even if it is 1%, that's still 1% that can harm you.
Some examples of how microorganisms affect humans and how they can enter through your body:
Respiratory tract (mouth and nose): Influenza virus which causes the flu.
Gastrointestinal tract (mouth oral cavity): Vibrio cholerae which causes cholera.
Urogenital tract: Escherichia coli which causes cystitis.
Breaks in the skin surface: Clostridium tetani which causes tetanus.
OD. All of the above, I believe.
Health Manual
SInce we got a standarized regulations from OSHA and NIOSH, workplaces rarely give any health manual to their employees ( especially if the main jobs is being done behind the desk like accountant, shop keeper or Programmer). The best resources are the standardized regulations from OSHA or the one with experience in your workplace