Final answer:
Beauty professionals must be prepared to deal with parasites, bacteria, and viruses as they are potentially harmful organisms associated with the spread of infectious diseases, but not gases, which are not organisms.
Step-by-step explanation:
When it comes to the spread of infectious disease, beauty professionals must be prepared to deal with all types of potentially harmful organisms except gases.
While parasites, bacteria, and viruses are types of organisms known to spread infectious diseases, gases are not considered organisms and therefore do not carry infectious diseases in the traditional biological sense. It's important for beauty professionals to maintain good hygiene and sanitation practices to prevent the transmission of these pathogens, and to understand that gases are not typically a part of infectious disease control within their field.