immune systems

• plural

  plural

  The grammatical form denoting more than one person, place, thing, or idea.

  of immune system.
  immune system

  noun

  a diffuse, complex network of interacting cells, cell products, and cell-forming tissues that protects the body from pathogens and other foreign substances, destroys infected and malignant cells, and removes cellular debris: the system includes the thymus, spleen, lymph nodes and lymph tissue, stem cells, white blood cells, antibodies, and lymphokines.

Example Sentences

See Examples For:

immune systems

"This completely changes our understanding of how mammalian immune systems can be organized and raises exciting new questions about why bats have been so evolutionarily successful and how they respond to viruses."

From Science Daily ● Sep. 3, 2026

Salmonella causes similar symptoms and can be especially dangerous for children, the elderly and people with weakened immune systems.

From The Wall Street Journal ● Aug. 21, 2026

Some participants with suppressed immune systems still developed strong responses.

From Science Daily ● Aug. 21, 2026

Children are also more vulnerable to pollution because their lungs and immune systems are still developing.

From BBC ● Aug. 18, 2026

There could be remnants of civilizations destroyed by wars or by beasts or by immune systems that failed a sudden bacterial pop quiz.

From "Challenger Deep" by Neal Shusterman

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