Virus survival outside the body and susceptibility to disinfection
Start with the big picture
Enveloped viruses such as influenza, HIV, and HSV tend to lose infectivity when dried or exposed to heat, detergents, alcohols, or ether. Non-enveloped viruses—including enteroviruses, adenovirus, norovirus, and papillomavirus—can persist longer and resist some common disinfectants. Inactivation depends on the method and conditions: heat sterilization is broadly effective, while alcohols work less reliably against non-enveloped viruses. Chlorine, oxidizing agents, aldehydes, and UV-C each have uses and limitations; surface coverage and organic soil can affect UV-C performance. Environmental conditions matter too: cold can preserve viruses, and routine refrigeration is not disinfection. The deeper lesson connects viral structure with environmental stability and infection-control choices.
What you'll learn
- Distinguish enveloped from non-enveloped viruses by structure and environmental stability.
- Explain why lipid envelopes increase susceptibility to drying and several disinfectants.
- Compare the broad uses and limitations of physical and chemical inactivation methods.
- Recognize how temperature, pH, humidity, and surface conditions affect viral survival.
Continue your study
Work through the complete notes and reinforce the topic with the study tools available in the full lesson.
