OSMT (Ontario Society of Medical Technologists) Practice Exam

Drying is not effective against:

1. a. vegetative cells

2. b. spores

3. c. viruses

4. d. helminth's

The correct answer is: b. spores

Drying is particularly ineffective against spores because spores are a highly resistant form of bacteria that can survive extreme environmental conditions, including desiccation (drying). Spores have a tough outer coating and can remain dormant for long periods, allowing them to withstand harsh conditions that would typically kill vegetative cells. In contrast, vegetative cells, which are actively growing and metabolizing, are more susceptible to drying since they rely on moisture for their cellular functions. Most viruses, depending on their structure, can also be sensitive to drying, though some may survive longer without moisture than bacteria. Helminths, or parasitic worms, typically require a moist environment for their eggs to remain viable, but they are not fundamentally resistant in the same way spores are. Thus, the ability of spores to endure drying underscores their resilience and explains why this method of decontamination is not effective against them.