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Gut bacterium protects mice from deadly pneumonia after flu — Level A1 — Abstract pattern of distorted purple shapes

Gut bacterium protects mice from deadly pneumonia after fluCEFR A1

28 Feb 2026

Adapted from LaTina Emerson-Georgia State, Futurity CC BY 4.0

Photo by Logan Voss, Unsplash

Level A1 – Beginner
2 min
77 words
  • Scientists study gut bacteria in the mouse intestine.
  • Some mice then get the flu.
  • After the flu, some mice get pneumonia in their lungs.
  • One gut bacterium protects mice from severe pneumonia.
  • The bacterium changes lung immune cells.
  • Immune cells normally remove bacteria from the lungs.
  • After flu, these immune cells can stop working well.
  • With the bacterium, immune cells keep fighting bacteria.
  • Protected mice survive serious infections more often.
  • Scientists hope this idea helps medicine later.

Difficult words

  • bacteriuma single tiny germ found in the body
    bacteria
  • intestinea long tube in the body that digests food
  • pneumoniaa serious infection in the lungs that hurts breathing
  • immunerelated to the body's defense against germs and disease
  • infectionwhen germs enter the body and make you sick
    infections
  • protectto keep someone or something safe from harm
    protects, Protected

Tip: hover, focus or tap highlighted words in the article to see quick definitions while you read or listen.

Discussion questions

  • Have you ever had the flu?
  • Do you think bacteria can help animals?
  • Would you like to learn more about medicine?

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