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Clementz, M. Deubiquitinating and interferon antagonism activities of coronavirus papain-like proteases. Chen, X. Protein Cell 5 , — Rui, Y. Signal Transduct. Target Ther. Ghosh, S. Antibiotics do not work for viral infections. There are antiviral medicines to treat some viral infections. Vaccines can help prevent you from getting many viral diseases.

The information on this site should not be used as a substitute for professional medical care or advice. Contact a health care provider if you have questions about your health. Viral Infections. Learn More Related Issues Specifics. See, Play and Learn Images. Research Clinical Trials Journal Articles. Resources Find an Expert.

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You cannot download interactives. People get sick when another organism, big or small, invades their body and infects them.

These infectious agents come in all shapes and sizes, and all of them pose different threats to the human body. Some are microscopic, such as bacteria or viruses, which attack human bodies on the cellular level. Others are larger, like fungi, which are unicellular or multicellular organisms that grow on and feed off organic material, including humans.

Finally, parasites such as tapeworms can find their way inside the human body and feed on blood and nutrients without killing their host. Learn more about infectious agents and their impact on human health with this curated resource collection. Even the most basic parts of a cell can enable complex cellular processes, and multifunctional organelles expand these capabilities to make advanced activities possible for higher life-forms.

Organelles are specialized structures that perform various tasks inside cells. Join our community of educators and receive the latest information on National Geographic's resources for you and your students. Skip to content. Image virus Viruses are microscopic biological agents that invade living hosts and infect their bodies by reproducing within their cell tissue. Photograph by Maryna Olyak. Twitter Facebook Pinterest Google Classroom.