Do not infect us
Human cells lack the receptors tailed phages need. A phage is not a cold.
Every millilitre of seawater and every gram of stool holds phages. They are part of the human microbiome as predators of our bacteria, not as human viruses.
Phage therapy — using phages against bacterial infection — is experimental or compassionate-use in most countries. This page does not tell anyone how to obtain or apply phages.
Body interfaces
Gut predator layer
Phages help set which bacterial strains bloom. Diversity of prey matters as much as diversity of hunters.
Phage therapy (concept)
Narrow host range can spare allies and can also miss the strain in the patient. Regulation and matching are the hard parts.
Antibiotic pairing ideas
Researchers study combinations. Resistance to phages exists too. Stewardship still matters.
Sewage viromes
Cities shed phage DNA that maps bacterial populations. Epidemiology, not a home test.
Lab history of DNA
Hershey–Chase (1952) used T2 phage to show DNA is the gene. Teaching heritage, not a weapon story.
Public health meets phages as sewage indicators and as a possible future tool beside antibiotics — never as a DIY kit.
Keep exploring
More in Tree of microbes
Bacteria
Single-celled prokaryotes with cell walls ? the oldest widespread life form, and both partners and pathogens.
Familiarity 95Viruses
Packets of DNA or RNA that are not cells — they replicate only inside living hosts.
Familiarity 96Fungi
A eukaryotic kingdom of yeasts, moulds and mushrooms — chitin walls, external digestion, partners of plants.
Familiarity 80Archaea
A prokaryotic domain that is not bacteria — methanogens, extremophiles and no known human pathogens.
Familiarity 35Protozoa
Motile unicellular eukaryotes — a teaching grade that includes pond ciliates and a minority of serious parasites.
Familiarity 58