Bacteriophage
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<speciesfyi-glossary slug="bacteriophage"></speciesfyi-glossary>Definition
A virus that specifically infects and replicates within bacteria, playing a key role in microbial ecology.
Detailed Explanation
Bacteriophages are the most abundant biological entities on Earth, with an estimated 10³¹ on the planet. They shape bacterial communities by selectively lysing dominant bacterial strains, enabling microbial diversity. Phage therapy — using bacteriophages to treat antibiotic-resistant bacterial infections — is being revived as resistance crisis deepens. Phages have been essential research tools: understanding their replication provided foundational insights into molecular biology.