🦠 Bacteria: The Good, The Bad, and The Antibiotic Crisis
📝 Last reviewed: August 2026
What bacteria are: single-celled living organisms — far bigger and more complex than viruses, with their own metabolism and the ability to divide on their own. They live everywhere: soil, water, food, and your body.
The good ones: gut bacteria digest fibre and make vitamins; lactobacilli ferment yoghurt and cheese; soil bacteria recycle nitrogen; some bacteria even make antibiotics (streptomyces makes streptomycin). Your microbiome outnumbers your human cells.
The bad ones: pathogens like Streptococcus, Salmonella, E. coli, Mycobacterium tuberculosis and Staphylococcus aureus cause everything from sore throats to pneumonia, food poisoning and TB.
How antibiotics work: they target bacterial structures humans lack — cell walls (penicillins), ribosomes (tetracyclines), or DNA copying (fluoroquinolones) — which is why they harm bacteria far more than you.
The resistance crisis: every antibiotic use selects for survivors. Resistant "superbugs" (MRSA, CRE, drug-resistant TB) now kill over a million people a year worldwide. Overuse in humans and livestock is the driver.
What you can do: take antibiotics exactly as prescribed, never demand them for colds (they are viral), never share or save them, and finish the course — the same rules protect the antibiotics for everyone.
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