Immunity: defense against infections essential for all living organisms - Takeaways - MDSpire

Immunity: defense against infections essential for all living organisms

  • By

  • Srinivas Akula

  • Sara Wernersson

  • Lars Hellman

  • June 23, 2026

  • 0 min

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  • 1

    Bacteria have developed complex defense systems against bacteriophages, including apoptosis-like mechanisms and restriction enzymes.

  • 2

    Adaptive immunity in bacteria is provided by the CRISPR–Cas system, which allows them to remember and target previous phage encounters.

  • 3

    Eukaryotic organisms utilize both innate and adaptive immune mechanisms, with innate systems being more ancient and widespread.

  • 4

    Vertebrate immunity combines adaptive and non-adaptive components, while invertebrates primarily rely on innate defense mechanisms.

  • 5

    Adaptive immunity has been identified in various organisms, including jawless fishes, which possess variable lymphocyte receptors (VLRs).

Original Source(s)

Immunity: defense against infections essential for all living organisms

  • by Srinivas Akula, Sara Wernersson, Lars Hellman

  • June 23, 2026

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