| Origin | Code | Comment | Supplementary Taxo |
|---|
| Abiotrophia defectiva | ISAbde | | |
| Acaryochloris marina | ISAcma | | |
| Acaryochloris sp. | ISAcas | | |
| Accumulibacter sp. | ISAcc | | |
| Acetivibrio cellulolyticus | ISAcce | | |
| Acetobacter aceti | ISAcac | | |
| Acetobacter pasteurianus | ISApa | | |
| Acetobacter xylinum | ISAxy | | |
| Acetohalobium arabaticum | ISAcar | | |
| Acetomicrobium hydrogeniformans | ISAchy | | |
| Acholeplasma axanthum | ISAax | | |
| Acholeplasma laidlawii | ISAla | | |
| Achromobacter denitrificans | ISAchd | | |
| Achromobacter sp | ISAch | | |
| Acidibacillus ferrooxidans | ISAfer | | |
| Acidihalobacter prosperus | ISAcpr | | |
| Acidimicrobium ferrooxidans | ISAcfe | | |
| Acidiphilium angustum | ISAan | | |
| Acidiphilium cryptum | ISAcr | | |
| Acidiphilium multivorum | ISAcmu | | |
| Acidithiobacillus caldus | ISAct | | |
| Acidithiobacillus ferridurans | ISAfd | | |
| Acidithiobacillus ferrivorans | ISAcif | | |
| Acidithiobacillus ferrooxidans | ISAfe | | |
| Acidithiobacillus thiooxidans | ISAth | | |
| Acidithrix ferrooxidans | ISAxf | | |
| Acidobacteria bacterium | ISAbc | | |
| Acidobacterium capsulatum | ISAcp | | |
| Acidothermus cellulolyticus | ISAce | | |
| Acidovorax avenae | ISAav | | |
| Acidovorax delafieldii | ISAcde | | |
| Acidovorax sp. | ISAisp | | |
| Acidovorax temperans | ISAte | | |
| Acinetobacter baumannii | ISAba | | |
| Acinetobacter Bereziniae | ISAbe | | |
| Acinetobacter calcoaceticus | ISAca | | |
| Acinetobacter haemolyticus | ISAha | | |
| Acinetobacter indicus | ISAin | | |
| Acinetobacter johnsonii | ISAjo | | |
| Acinetobacter junii | ISAju | | |
| Acinetobacter lwoffii | ISAlw | | |
| Acinetobacter parvus | ISAcpa | | |
| Acinetobacter pittii | ISApi | | |
| Acinetobacter pseudolwoffii | ISAps | | |
| Acinetobacter radioresistens | ISAcra | | |
| Acinetobacter soli | ISAso | | |
| Acinetobacter sp. | ISAcsp | | |
| Acinetobacter towneri | ISAto | | |
| Acinetobacter ursingii | ISAcur | | |
| Acinetobacter variabilis | ISAcva | | |
| Acinetobacter venetianus | ISAcve | | |
| Actinobacillus actinomycetemcomitans | ISAac | | Aggregatibacter actinomycetemcomitans |
| Actinobacillus pleuropneumoniae | ISApl | | |
| Actinobacillus ureae | ISAur | | |
| Actinobacteria bacterium | ISAcba | | |
| Actinobaculum massiliae | ISAmas | | |
| Actinomyces odontolyticus | ISAod | | |
| Actinomyces turicensis | ISActu | | |
| Actinosynnema mirum | ISAmi | | |
| Aeribacillus pallidus | ISAepa | | |
| Aeromonas caviae | ISAeca | | |
| Aeromonas dhakensis | ISAdh | | |
| Aeromonas hydrophila | ISAhy | | |
| Aeromonas media | ISAeme | | |
| Aeromonas punctata | ISApu | | |
| Aeromonas rivuli | ISAri | | |
| Aeromonas salmonicida | ISAs | | |
| Aeromonas sp. | ISAesp | | |
| Aeromonas veronii | ISAve | | |
| Aggregatibacter actinomycetemcomitans | ISAac | | |
| Agrobacterium radiobacter | ISAra | | |
| Agrobacterium rhizogenes | ISAr | | |
| Agrobacterium sp. | ISAgsp | | |
| Agrobacterium tumefaciens | ISAtu | | |
| Agrobacterium vitis | ISAvi | | |
| Akkermansia muciniphila | ISAmu | | |
| Alcaligenes eutropha | ISRme | | |
| Alcaligenes faecalis | ISAlfa | | |
| Alcaligenes sp. | ISAlsp | | |
| Alcanivorax borkumensis | ISAbo | | |
| Algibacter sp. | ISAlg | | |
| Algoriphagus alkaliphilus | ISAal | | |
| Algoriphagus faecimaris | ISAfa | | |
| Algoriphagus hitonicola | ISAhi | | |
| Alicycliphilus denitrificans | ISAlde | | |
| Alicycliphilus sp. | ISAlisp | | |
| Alicyclobacillus acidocaldarius | ISAlac | | |
| Alicyclobacillus shizuokensis | ISAsh | | |
| Alicyclobacillus sp. | ISAlis | | |
| Aliivibrio wodanis | ISAwo | | |
| Alistipes onderdonkii | ISAon | | |
| Alkalilimnicola ehrlichei | ISAeh | | |
| Alkaliphilus metalliredigens | ISAme | | |
| Alloiococcus otitis | ISAot | | |
| Alpha proteobacterium | ISApr | | |
| Alphaproteobacteria bacterium | ISAlba | | |
| Alteromonas macleodii | ISAma | | |
| Ammonifex degensii | ISAmde | | |
| Amycolatopsis acidiphila | ISAmac | | |
| Anabaena sp. | ISAsp | | |
| Anabaena variabilis | ISAva | | |
| Anaerobaculum hydrogeniformans | ISAnhy | | |
| Anaerobaculum mobile | ISAmo | | |
| Anaerocolumna sp. | ISAasp | | |
| Anaerolinea thermolimosa | ISAnth | | |
| Anaerolineales bacterium | ISAnba | | |
| Anaeromyxobacter dehalogenans | ISAde | | |
| Anaeromyxobacter sp. | ISAnsp | | |
| Anaerostipes coli | ISAco | | |
| Anaerotruncus sp. | ISAnasp | | |
| Aneurinibacillus migulanus | ISAnmi | | |
| Anoxybacillus amylolyticus | ISAam | | |
| Anoxybacillus flavithermus | ISAfl | | |
| Anoxychlamydiales bacterium | ISAoba | | |
| Aquifex aeolicus | ISAae | | |
| Archaeoglobus fulgidus | ISA | Predefined common nomenclature | |
| Archaeoglobus veneficus | ISArve | | |
| Armatimonadetes bacterium | ISAmba | | |
| Arsenophonus endosymbiont | ISArse | | |
| Arthrobacter arilaitensis | ISAar | | |
| Arthrobacter aurescens | ISAau | | |
| Arthrobacter chlorophenolicus | ISAcl | | |
| Arthrobacter nicotinovorans | ISAni | | |
| Arthrobacter sp. | ISArsp | | |
| Arthrospira maxima | ISArma | | |
| Arthrospira sp. | ISAtsp | | |
| Atribacteria bacterium | ISAtba | | |
| Aurantimonas sp. | ISAusp | | |
| Aureispira sp. | ISAursp | | |
| Azoarcus sp. | ISAzo | | |
| Azorhizobium caulinodans | ISAzca | | |
| Azospirillum brasilense | ISAzba | | |
| Azospirillum lipoferum | ISAli | | |
| Azospirillum sp. | ISAzs | | |
| Azotobacter beijerinckii | ISAzbe | | |
| Azotobacter chroococcum | ISAzch | | |
| Azotobacter sp. | ISAzsp | | |
| Azotobacter vinelandii | ISAzvi | | |