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Everything About Microbes

Microbe timeline

Discoveries, outbreaks and tools that changed how we see the invisible.

c.200 BCE Fermentation ? East Asian soy ferments

Written traces of jiang-style pastes ancestral to doenjang and miso.

1670s Fungi ? Leeuwenhoek's yeasts

Antonie van Leeuwenhoek sketches globules in beer — among the first microbial fungi seen.

1670s Protozoa ? Animalcules seen

Antonie van Leeuwenhoek describes motile specks from water and teeth — protozoa among them.

1676 Bacteria ? Animalcules seen

Antonie van Leeuwenhoek describes moving specks from teeth and water.

1676 Biofilms ? Animalcules on teeth

van Leeuwenhoek describes motile specks from dental plaque.

1729 Fungi ? Micheli's spores

Pier Antonio Micheli shows mushrooms arise from spores, not spontaneous mud.

1796 Vaccines and immunity ? Jenner cowpox

Cowpox material is used to protect against smallpox; publication follows in 1798.

1817 Protozoa ? Goldfuss coins Protozoa

Georg Goldfuss uses Protozoa for 'first animals' — a name that outlived the zoology.

1836 Nitrogen cycle ? Boussingault rotations

Jean-Baptiste Boussingault measures that legumes enrich soil nitrogen.

1854 Hygiene and balance ? Snow and the pump

John Snow maps cholera to a Soho pump — clean water as data, not fashion.

1857 Fungi ? Pasteur on fermentation

Louis Pasteur ties living yeast to alcoholic fermentation, attacking purely chemical vitalisms of the day.

1857 Fermentation ? Pasteur on lactic ferment

Louis Pasteur argues living cells cause fermentation.

1860s Bacteria ? Pasteur & spoilage

Swan-neck flasks and pasteurisation attack spontaneous generation and save food.

1860s Fermentation ? Swan-neck flasks

Pasteur blocks spontaneous generation while keeping air.

1875 Helicobacter pylori ? Bottcher spirals

Early sketches of gastric spirals are later cited as missed chances.

1876 Bacteria ? Koch's anthrax

A specific bacillus is tied to a specific disease ? germ theory gets a method.

1880 Protozoa ? Laveran sees malaria

Alphonse Laveran finds pigmented parasites in blood — protozoa enter tropical medicine.

1880 Staphylococcus aureus ? Ogston names staph

Grape-like clusters in abscesses get a lasting name.

1880s Archaea ? Methane from mud

Nineteenth-century chemists already knew marshes make methane. The microbes responsible were still unnamed archaea.

1880s Skin microbiome ? Unna and skin flora

Early dermatologists describe resident microbes on healthy skin.

1882 Tuberculosis ? Koch's announcement

The bacillus is shown; germ theory gains a famous chronic disease.

1884 Bacteria ? Gram stain

Hans Christian Gram gives clinics a two-bucket wall test still used daily.

1884 Staphylococcus aureus ? Rosenbach aureus

Friedrich Rosenbach distinguishes S. aureus by colony color.

1885 Soil microbes ? Frank names mycorrhiza

Albert Bernhard Frank coins mycorrhiza for fungus-root unions.

1885 Vaccines and immunity ? Pasteur rabies

A public rabies vaccination of Joseph Meister becomes a founding legend of the lab-vaccine era.

1885 Escherichia coli ? Escherich describes coli

Infant stools yield a common colon bacillus that later bears his name.

1887 Soil microbes ? Winogradsky chemolithotrophy

Sergei Winogradsky shows microbes can live on inorganic chemistry.

1888 Soil microbes ? Hellriegel nodules

Nitrogen fixation in legumes is tied to living root nodules.

1888 Nitrogen cycle ? Hellriegel and Wilfarth

Living nodules, not just soil magic, explain legume nitrogen.

1890s Skin microbiome ? Sabouraud and fungi

Raymond Sabouraud classifies dermatophytes.

1892 Viruses ? Ivanovsky's filter

Dmitri Ivanovsky shows tobacco mosaic disease passes a bacterial filter — a founding observation of virology.

1895 Nitrogen cycle ? Winogradsky nitrifiers

Chemolithotrophic nitrifiers are isolated as a teaching pair.

1895 Tuberculosis ? X-ray lungs

Roentgen's rays later let clinics see cavities without opening the chest.

1897 Protozoa ? Ross and mosquitoes

Ronald Ross demonstrates mosquito stages of bird malaria, opening the vector map.

1897 Fermentation ? Buchner cell-free yeast

Eduard Buchner shows juice without intact cells can still ferment.

1898 Viruses ? Beijerinck's fluidum

Martinus Beijerinck calls the agent contagium vivum fluidum — living, fluid, and not a cultured bacterium.

1901 Nitrogen cycle ? Beijerinck Azotobacter

Free-living aerobic fixers join the nodule story.

1903 Protozoa ? Bruce and trypanosomes

David Bruce ties tsetse flies to nagana and sleeping-sickness trypanosomes.

1904 Soil microbes ? Lipman soil biology

Early textbooks treat soil as a biological system, not mere dirt.

1907 Gut microbiome ? Metchnikoff and yoghurt

Élie Metchnikoff popularises sour milk and longevity ideas — a probiotic prehistory.

1907 Probiotics ? Metchnikoff's sour milk

A Nobel laureate links lactic microbes to longevity ideas in Paris.

1908 Hygiene and balance ? Chlorination in US

Jersey City's early municipal chlorination becomes a model for urban water.

1909 Nitrogen cycle ? Haber ammonia

Fritz Haber demonstrates high-pressure catalytic ammonia.

1911 Viruses ? Rous sarcoma

Peyton Rous transmits a hen tumour with a filtrate, linking some cancers to viruses decades before oncogenes were named.

1913 Nitrogen cycle ? Bosch scale-up

Carl Bosch industrialises the process at Oppau — bread and explosives share a factory.

1915 Bacteriophages ? Twort's glassy colonies

Frederick Twort describes glassy dissolution of micrococci — an early phage observation.

1917 Bacteriophages ? d'Hérelle names phage

Félix d'Hérelle coins bacteriophage and begins therapeutic attempts in Paris.

1918 Mutation and variants ? H1N1 pandemic

A severe influenza pandemic showed how a novel antigenic package can sweep a world without modern vaccines.

1918 Influenza ? H1N1 pandemic

A severe pandemic shows how a novel package can sweep a world without modern shots.

1919 Fermentation ? Orla-Jensen lactic map

A systematic naming of lactic bacteria that still echoes in dairy labs.

1919 Escherichia coli ? Castellani and Chalmers

The genus Escherichia is formally proposed.

1920s Bacteriophages ? Eliava Institute

George Eliava's Tbilisi school builds a lasting phage-medicine tradition.

1921 Vaccines and immunity ? BCG first use

Calmette and Guerin give an attenuated bovine tuberculosis vaccine to an infant in Paris.

1921 Tuberculosis ? BCG first infant

An attenuated vaccine begins a century of childhood programmes.

1922 Escherichia coli ? K-12 isolated

A patient strain begins a long domestication into a lab standard.

1928 Bacteria ? Penicillin noted

Fleming sees a mould zone; Florey and Chain later make a medicine.

1928 Fungi ? Fleming's mould

Alexander Fleming notes a Penicillium zone on staphylococci — later Florey and Chain make a medicine.

1928 Antibiotic resistance ? Penicillin noted

Fleming sees a mould zone on staphylococci; a medicine arrives only after 1940s production.

1928 Horizontal gene transfer ? Griffith effect

Heat-killed smooth pneumococci 'transform' live rough cells in mice.

1929 Norovirus ? Zahorsky winter vomiting

A clinical description of epidemic winter vomiting predates the particle.

1930s Skin microbiome ? Transient vs resident

Teaching splits passing hitchhikers from organisms that persist.

1933 Archaea ? Kluyver and methanogens

Culture work on methane bacteria begins in earnest; they are still filed under bacteria.

1933 Biofilms ? Zobell marine films

Claude Zobell studies bacteria attaching to submerged surfaces.

1933 Influenza ? Human virus isolated

Smith, Andrewes and Laidlaw isolate influenza A from people in London.

1935 Viruses ? Stanley crystallises TMV

Wendell Stanley crystallises tobacco mosaic virus, shocking biologists who thought 'alive' could not be a crystal.

1940s Bacteriophages ? Luria–Delbrück

Fluctuation tests with phages prove bacterial mutations are random, not directed.

1940s Influenza ? First inactivated shots

Military programmes begin killed-virus influenza vaccines.

1940s Staphylococcus aureus ? Penicillin era

Staph wound infections become treatable, then quickly learn the enzyme.

1943 Soil microbes ? Streptomycin

Selman Waksman's lab isolates a soil-derived tuberculosis drug.

1944 Bacteria ? Streptomycin

Soil microbe chemistry hits tuberculosis ? a reminder that allies live in dirt.

1944 Horizontal gene transfer ? DNA is the principle

Avery's group chemically shows the transforming substance is DNA.

1944 Tuberculosis ? Streptomycin

A soil-microbe drug first hits TB — resistance appears if it is used alone.

1945 Antibiotic resistance ? Nobel warning

Fleming tells the public that careless use will select resistant microbes.

1946 Horizontal gene transfer ? Conjugation shown

Lederberg and Tatum demonstrate genetic exchange by contact in E. coli.

1952 Viruses ? Hershey–Chase

Phage blender experiments show DNA, not protein, is the hereditary material of T2 bacteriophage.

1952 Bacteriophages ? Hershey–Chase

T2 blender experiments settle DNA as hereditary material.

1952 Horizontal gene transfer ? Transduction named

Zinder and Lederberg show phage can carry bacterial genes.

1952 Tuberculosis ? Isoniazid era

Combination oral therapy begins to empty sanatoria in rich countries.

1955 Viruses ? Polio vaccine licensed (US)

Jonas Salk's inactivated vaccine enters wide use; Albert Sabin's oral vaccine follows. Incidence collapses where campaigns hold.

1955 Protozoa ? Giemsa still standard

Stains from the early 1900s remain daily tools for malaria films in many clinics.

1955 Vaccines and immunity ? Salk polio

Inactivated polio vaccine enters wide use in the United States after field trials.

1957 Mutation and variants ? H2N2 Asian flu

A reassortant H2N2 subtype replaced H1N1 in humans — a classic antigenic-shift pandemic.

1957 Influenza ? H2N2 shift

Asian flu replaces H1N1 in humans — a classic reassortant pandemic.

1959 Horizontal gene transfer ? Plasmid word

Joshua Lederberg popularizes 'plasmid' for extra-chromosomal elements.

1959-61 Staphylococcus aureus ? Methicillin then MRSA

A new beta-lactam is answered within a few years.

1960s Gut microbiome ? Germ-free mammals

Isolators show immune and gut-wall development depend on microbes.

1960s-80s Hygiene and balance ? Allergy rise noted

Asthma and hay fever climb in many affluent countries as infections fall.

1961 Bacteriophages ? MS2 RNA phage

A tiny RNA phage becomes a model; its genome is later the first fully sequenced (1976).

1961 Antibiotic resistance ? MRSA reported

Resistance to methicillin appears in S. aureus within a few years of the drug.

1963 Vaccines and immunity ? Measles vaccine

Licensed measles vaccines begin a long decline of a highly contagious childhood killer.

1965 Probiotics ? Word 'probiotic' in print

Lilly and Stillwell use probiotic for substances that favour microbes — a meaning later narrowed.

1965 Skin microbiome ? Marples ecology book

Mary Marples treats skin as habitat, not a sterile sheet.

1968 Mutation and variants ? H3N2 Hong Kong flu

Another HA shift produced H3N2, still a major seasonal actor after decades of drift.

1968 Influenza ? H3N2 shift

Hong Kong flu introduces H3, still a major seasonal actor after decades of drift.

1968 Staphylococcus aureus ? US hospital MRSA

Reports spread beyond Europe; wards become a resistance classroom.

1968 Norovirus ? Norwalk school

An Ohio outbreak becomes the later namesake.

1969 Fungi ? Whittaker's five kingdoms

Robert Whittaker popularises Fungi as a separate kingdom in ecology teaching.

1970s Gut microbiome ? Anaerobe culture boom

Hungate-style methods reveal the colon is not an empty tube.

1970s Fermentation ? Kimchi microbiology papers

Leuconostoc and Lactobacillus successions in kimchi enter modern journals.

1970s Horizontal gene transfer ? R-plasmids clinical

Resistance plasmids become a daily hospital genetics story.

1971 Mutation and variants ? Eigen quasispecies

Theoretical work framed replicators as error-prone clouds, later a standard RNA-virus metaphor.

1972 Norovirus ? EM visualization

Immune electron microscopy shows the Norwalk agent.

1973 Escherichia coli ? Genome era begins

E. coli genetics is already a language of operons before full genomes arrive.

1977 Bacteria ? Carl Woese's split

rRNA trees peel Archaea away from 'bacteria' as a mixed bag.

1977 Archaea ? Woese–Fox split

Carl Woese and George Fox publish 16S rRNA trees that peel archaea away from bacteria.

1977 Soil microbes ? Soil as gene mine

After rRNA methods spread, soil becomes a catalogue of unseen lineages.

1977 Influenza ? H1N1 returns

An H1N1 lineage reappears in people and co-circulates with H3N2.

1978 Archaea ? Methanogen lipids

Unusual ether lipids corroborate that methanogens are not ordinary bacteria.

1978 Biofilms ? Costerton coinage

The modern biofilm concept is framed for medicine and industry together.

1979 Archaea ? Bacteriorhodopsin fame

Halobacterium's purple membrane becomes a model for a light-driven proton pump.

1979-82 Helicobacter pylori ? Warren's biopsies

Robin Warren sees curved bacteria on gastric biopsies in Perth.

1980 Vaccines and immunity ? Smallpox eradicated

WHO certifies the end of a human disease after ring vaccination and surveillance.

1980s Protozoa ? Molecular un-kingdom

rRNA trees shatter a single protozoan kingdom into distant eukaryotic clades.

1980s Skin microbiome ? Hand hygiene evidence

Hospital studies tie handwashing to fewer transmitted staphylococci.

1980s Staphylococcus aureus ? Vancomycin reliance

Last-line glycopeptides become a common hospital habit for MRSA.

1982 Biofilms ? CF lung ecology

Work on Pseudomonas in cystic fibrosis popularizes persistent-film thinking.

1982 Escherichia coli ? O157 outbreaks

STEC O157:H7 is tied to undercooked beef clusters in the United States.

1982 Helicobacter pylori ? Culture success

A forgotten holiday incubator run yields colonies — told as history, not a protocol.

1983 Viruses ? HIV identified

Luc Montagnier's group isolates the retrovirus later named HIV; the 2008 Nobel recognised that lineage of work.

1983 Antibiotic resistance ? ESBL described

Extended-spectrum beta-lactamases begin to empty the cephalosporin cupboard in hospitals.

1984 Helicobacter pylori ? Marshall ingests

A public self-experiment produces gastritis and then recovery after treatment — anecdote, not advice.

1985 Probiotics ? LGG isolated

Lactobacillus rhamnosus GG becomes a much-studied strain with a public code.

1988 Vaccines and immunity ? Polio eradication start

The Global Polio Eradication Initiative begins; wild types later shrink to a few countries.

1989 Hygiene and balance ? Strachan BMJ paper

The hygiene hypothesis is named from family-size patterns in hay fever.

1989 Horizontal gene transfer ? Integron described

Cassette-capture systems explain stacked resistance genes.

1989 Helicobacter pylori ? Genus Helicobacter

The organism is moved from Campylobacter into its own genus.

1990 Archaea ? Three-domain tree

Woese, Kandler and Wheelis formally argue for Bacteria, Archaea and Eucarya.

1990 Norovirus ? Genome sequenced

Norwalk virus RNA is sequenced, opening genotype talk.

1990s Soil microbes ? Metagenomes begin

Direct DNA from soil skips culture.

1990s Biofilms ? Quorum sensing boom

Chemical conversation in films becomes a major research theme.

1990s Hygiene and balance ? ALEX and farms

Alpine farm-child studies add livestock and stables to the exposure list.

1990s Staphylococcus aureus ? Community MRSA

Healthy people without hospital ties begin to appear in outbreak reports.

1990s Norovirus ? RT-PCR diagnostics

Stool tests make outbreak confirmation routine in public-health labs.

1993 Tuberculosis ? WHO emergency

WHO declares TB a global emergency as HIV and neglect reverse gains.

1993 Escherichia coli ? Jack in the Box

A large hamburger outbreak drives stricter ground-beef rules and public memory.

1994 Helicobacter pylori ? IARC Group 1

H. pylori is classed as a gastric carcinogen.

1995 Bacteria ? First bacterial genome

Haemophilus influenzae is sequenced; metagenomics will soon skip culture entirely.

1995 Nitrogen cycle ? Anammox named

Anaerobic ammonium oxidation is recognised as a missing shortcut.

1995 Tuberculosis ? DOTS strategy

A five-element programme standardizes finding cases and supporting treatment.

1996 Fungi ? Yeast genome

S. cerevisiae is fully sequenced — a eukaryotic model that still trains genetics students.

1996 Archaea ? First archaeal genome

Methanocaldococcus jannaschii is sequenced — a hydrothermal methanogen with a surprising gene mix.

1997 Mutation and variants ? H5N1 in Hong Kong

Human cases of avian H5N1 raised zoonotic-shift fears; control focused on birds and exposure, not home experiments.

1997 Escherichia coli ? E. coli K-12 genome

A laboratory genome is published, a milestone of the sequencing age.

2000s Fungi ? White-nose & bats

Pseudogymnoascus destructans devastates North American bats, showing fungal pathogens reshape wildlife.

2000s Staphylococcus aureus ? USA300 wave

A community clone becomes a widely discussed skin-infection actor in the US.

2000s Norovirus ? Cruise reporting rules

Vessel sanitation programmes publish outbreak thresholds and logs.

2001 Probiotics ? FAO/WHO definition

Live microorganisms, adequate amounts, health benefit — the sentence labels still quote.

2001 Fermentation ? Probiotic definition split

FAO/WHO separates live food from probiotic-with-evidence.

2002 Probiotics ? Guidelines follow

Working-group guidelines push strain identification and safety dossiers.

2002 Norovirus ? Genus Norovirus

Official naming settles on Norovirus inside Caliciviridae.

2003 Viruses ? SARS-CoV outbreak

A novel coronavirus spreads from a hotel cluster into hospitals. It previews later coronavirus surveillance.

2003 Biofilms ? NIH biofilm note

US agencies highlight biofilms in chronic infection research agendas.

2003 Hygiene and balance ? Old Friends essay

Rook argues for co-evolved organisms rather than dirt as such.

2005 Gut microbiome ? 16S surveys scale

High-throughput tags show person-to-person differences without growing every cell.

2005 Helicobacter pylori ? Nobel Prize

Marshall and Warren receive the physiology or medicine prize.

2006 Gut microbiome ? Turnbaugh obesity mice

Transplantable community effects in mice ignite metabolism headlines — mice are not men.

2007 Bacteriophages ? CRISPR spacer proof

Barrangou and colleagues show spacers confer phage resistance in Streptococcus thermophilus.

2007 Gut microbiome ? Human Microbiome Project

NIH launches a reference map of healthy volunteers' communities.

2007 Skin microbiome ? HMP includes skin

The Human Microbiome Project samples skin alongside gut and mouth.

2008 Antibiotic resistance ? NDM-1 noted

A carbapenemase later named NDM-1 shows how travel and hospitals can move last-line failure genes.

2008-10s Horizontal gene transfer ? NDM tours

A carbapenemase gene illustrates intercontinental plasmid travel in patients.

2009 Skin microbiome ? Grice twenty sites

A Science paper maps how body site outweighs individuality for many taxa.

2009 Mutation and variants ? H1N1 pandemic

A triple-reassortant H1N1 spread globally; seasonal H1N1 was displaced. Vaccines were updated the following season.

2009 Influenza ? Pandemic H1N1

A triple-reassortant H1N1 spreads globally; seasonal H1N1 is displaced.

2010s Bacteriophages ? Compassionate phage cases

Documented last-resort cases return phage therapy to Western journals — still not a home kit.

2010s Skin microbiome ? Shotgun skin papers

Metagenomes add viruses and fungi to the bacterial story.

2010s Soil microbes ? Global soil maps

Consortia try to map soil biomes the way oceans were mapped.

2010s Biofilms ? Device bundles

Insertion checklists cut catheter bloodstream infections.

2010s-20s Tuberculosis ? New tools

Molecular tests and new drugs shorten some resistant courses — still specialist care.

2010s-20s Norovirus ? GII.4 waves

Successive GII.4 variants dominate many global seasons.

2010s-20s Helicobacter pylori ? Korea decline

Seroprevalence falls as housing, plumbing and treatment access change.

2011 Escherichia coli ? O104:H4 Europe

Sprouts carry an unusual hybrid pathotype across several countries.

2012 Fungi ? Batrachochytrium crises

Chytrid fungi are recognised as drivers of global amphibian declines — a conservation emergency.

2012 Hygiene and balance ? Biodiversity add-on

Finnish and other work links surrounding biodiversity to atopic risk talk.

2013 Gut microbiome ? FMT trial landmark

A randomised trial shows stool transplant can beat vancomycin for recurrent C. difficile in a clinical setting.

2014 Probiotics ? ISAPP consensus

The International Scientific Association for Probiotics and Prebiotics restates the 2001 core.

2015 Archaea ? Lokiarchaeota

Lokiarchaeota genomes blur the archaea–eukaryote boundary and revive endosymbiosis debates.

2015 Nitrogen cycle ? Comammox described

Complete ammonia oxidisers collapse the two-step textbook in some lineages.

2015 Antibiotic resistance ? WHO Global Action Plan

Member states endorse a five-pillar plan: awareness, surveillance, sanitation, stewardship, research.

2016 Antibiotic resistance ? O'Neill review

An economic report popularizes huge future death and GDP figures to jolt governments.

2017 Antibiotic resistance ? Priority pathogens

WHO publishes a list to steer research toward the worst drug–bug gaps.

2018 Probiotics ? Evidence maps thicken

Cochrane-style reviews show benefit in some diarrhoea settings and uncertainty in many others.

2020 Mutation and variants ? SARS-CoV-2 pandemic

A new coronavirus spread worldwide. Genome sharing made lineage tracking a public dashboard.

2020 Vaccines and immunity ? mRNA COVID shots

Decades of lipid-nanoparticle and mRNA work meet a pandemic; emergency authorizations arrive in December.

2020s Gut microbiome ? Diversity, not a list

Consensus papers stress functions and fibre over a universal species shopping list.

2020s Probiotics ? Live biotherapeutic drugs

Defined consortia enter drug-style pipelines, separate from yoghurt aisle branding.

2020s Biofilms ? Spatial imaging

Better imaging and sequencing show mixed-species architecture in plaque and wounds.

2020s Hygiene and balance ? Nuanced textbooks

Texts warn against anti-hygiene readings while keeping the immune-training question open.

2020s Influenza ? COVID-era winters

Non-pharmaceutical measures briefly suppressed flu, then waves returned with mixed timing.

2021 Protozoa ? Malaria vaccine milestone

WHO recommends RTS,S for children in selected regions — a protozoan vaccine after decades.

2021 Mutation and variants ? Delta then Omicron

WHO VOC labels marked lineages with different spread and immune-escape profiles in 2021–22.

c.7000 BCE Fermentation ? Early alcohol residues

Neolithic jars in the Caucasus and China show early fermented drinks.