*Co esponding au ho : Venugopal Reddy I agam eddy
Copy igh © 2025 Au ho (s) e ain he copy igh o his a icle. This a icle is published unde he e ms o he C ea i e Commons A ibu ion Liscense 4.0.
S ep ococcus sali a ius K12: A comp ehensi e e iew on i s ole as a p obio ic in
pedia ic and gene al heal h
Venugopal Reddy I agam eddy *
Depa men o Paedia ics, O um Woman and Child Speciali y Hospi al, Bangalo e, India.
Wo ld Jou nal o Biology Pha macy and Heal h Sciences, 2025, 21(01), 290-293
Publica ion his o y: Recei ed on 28 No embe 2024; e ised on 07 Janua y 2025; accep ed on 10 Janua y 2025
A icle DOI: h ps://doi.o g/10.30574/wjbphs.2025.21.1.0022
Abs ac
S ep ococcus sali a ius K12 (S. sali a ius K12) is a pionee ing p obio ic s ain de i ed om he human o al mic obio a,
known o i s unique abili y o enhance o al and uppe espi a o y ac heal h. This comp ehensi e e iew explo es
he backg ound, mechanism o ac ion, clinical applica ions, limi a ions, and e idence-based use o S. sali a ius K12, wi h
a special ocus on i s ole in pedia ics. E idence sugges s ha S. sali a ius K12 helps educe he incidence o uppe
espi a o y ac in ec ions (URTIs), o i is media, hali osis, and den al ca ies. Despi e i s p omising bene i s, challenges
such as sho - e m coloniza ion and a iabili y in e icacy wa an u he in es iga ion.
Keywo ds: S ep ococcus sali a ius K12; P obio ics; O al Mic obio a; Pedia ic Heal h; Uppe Respi a o y T ac
In ec ions; Hali osis; Den al Ca ies; Immunomodula ion; E idence-Based Medicine; Mic obial The apy
1. In oduc ion
The ole o p obio ics in heal h and disease has gained signi ican a en ion o e he pas wo decades. While p obio ics
ha e adi ionally been associa ed wi h gu heal h, eme ging e idence highligh s hei applica ions beyond he
gas oin es inal ac . S ep ococcus sali a ius K12, a na u ally occu ing commensal in he human o al ca i y,
ep esen s a p omising p obio ic s ain wi h dis inc applica ions in o al and espi a o y heal h, pa icula ly in child en.
This a icle e iews he scien i ic basis, applica ions, and limi a ions o S. sali a ius K12 in clinical p ac ice.
2. Backg ound o S ep ococcus sali a ius K12
S ep ococcus sali a ius is a G am-posi i e, acul a i e anae obic bac e ium p edominan ly ound in he human o al
ca i y and uppe espi a o y ac . The K12 s ain was i s isola ed om a heal hy indi idual wi h a his o y o low
incidence o s ep ococcal in ec ions. I is dis inguished by i s abili y o p oduce wo speci ic bac e iocins, sali a icin A2
and sali a icin B, which con e an imic obial ac i i y agains pa hogens such as S ep ococcus pyogenes and
Haemophilus in luenzae. This cha ac e is ic makes S. sali a ius K12 a po en ial p obio ic o main aining o al and
espi a o y heal h.
3. Mechanism o Ac ion
3.1. Bac e iocin P oduc ion
S. sali a ius K12 p oduces sali a icin A2 and sali a icin B, an imic obial pep ides ha inhibi he g ow h o pa hogenic
bac e ia in he o al ca i y and pha ynx. These bac e iocins a ge speci ic bac e ial s ains, educing he isk o in ec ions
such as s ep ococcal pha yngi is and o i is media.
Wo ld Jou nal o Biology Pha macy and Heal h Sciences, 2025, 21(01), 290-293
291
3.2. Compe i i e Coloniza ion
S. sali a ius K12 adhe es o mucosal su aces, o ming bio ilms ha ac as physical ba ie s agains pa hogenic
coloniza ion. This compe i i e exclusion educes he likelihood o pa hogen o e g ow h in he o al and uppe
espi a o y ac .
3.3. Immunomodula ion
S. sali a ius K12 enhances mucosal immuni y by s imula ing he p oduc ion o sec e o y IgA, which plays a c i ical ole
in pa hogen neu aliza ion. I also in e ac s wi h immune cells o modula e in lamma o y esponses, p omo ing a
balanced immune en i onmen .
3.4. Neu aliza ion o Vola ile Sul u Compounds
In cases o hali osis, S. sali a ius K12 educes he p oduc ion o ola ile sul u compounds by al e ing he mic obial
balance in he o al ca i y, hus imp o ing o al odo .
4. Applica ions in Pedia ic and Gene al Heal h
4.1. P e en ion o Uppe Respi a o y T ac In ec ions (URTIs)
URTIs, including pha yngi is and onsilli is, a e common in pedia ic popula ions. Se e al s udies demons a e ha
egula use o S. sali a ius K12 educes he equency and se e i y o URTIs by inhibi ing pa hogenic bac e ia such as
S ep ococcus pyogenes.
4.1.1. Key E idence
Di Pie o e al. (2016) conduc ed a andomized con olled ial (RCT) in ol ing child en wi h ecu en URTIs. S.
sali a ius K12 lozenges signi ican ly educed in ec ion episodes compa ed o placebo.
4.2. O i is Media P e en ion
O i is media, an in lamma ion o he middle ea , is a leading cause o pedia ic isi s. S. sali a ius K12 has shown p omise
in p e en ing o i is media by supp essing pa hogens like S ep ococcus pneumoniae and Haemophilus in luenzae.
4.2.1. Key E idence
A 2020 s udy by Ma chisio e al. ound ha child en adminis e ed S. sali a ius K12 had ewe episodes o o i is media
and equi ed ewe an ibio ics.
4.3. Managemen o Hali osis
Hali osis, o bad b ea h, o en esul s om mic obial imbalances in he o al ca i y. S. sali a ius K12 neu alizes
malodo ous compounds and p omo es a heal hy o al mic obiome.
4.3.1. Key E idence
Bu on e al. (2013) demons a ed ha S. sali a ius K12 supplemen a ion educed hali osis symp oms in 85% o
pa icipan s wi hin wo weeks o use.
4.4. O al Heal h
Den al ca ies and gum in lamma ion a e p e alen in child en. By p oducing bac e iocins and inhibi ing ca iogenic
bac e ia, S. sali a ius K12 suppo s o al hygiene and educes he isk o ca i ies.
4.5. Po en ial Use in Sinusi is and ENT Diso de s
Eme ging e idence sugges s a po en ial ole o S. sali a ius K12 in managing sinusi is and o he ENT diso de s by
modula ing mic obial lo a and educing in lamma ion.
Wo ld Jou nal o Biology Pha macy and Heal h Sciences, 2025, 21(01), 290-293
292
5. Clinical E idence
Table 1 Key S udies on S. sali a ius K12
S udy
Popula ion
In e en ion
Ou come
Re e ence
Di Pie o e al
Child en wi h
ecu en URTIs
S. sali a ius K12
lozenges
↓ URTI episodes, ↓ an ibio ic
usage
Pedia ic ID J,
2016
Ma chisio e al
Child en wi h o i is
media
S. sali a ius K12
able s
↓ O i is media episodes, ↓
an ibio ic cou ses
In J Pedia ic ORL,
2020
Bu on e al.
Adul s wi h hali osis
S. sali a ius K12
lozenges
Imp o ed o al odo in 85% o
pa icipan s
O al Mic obiol,
2013
Guglielme i e
al
Child en
P obio ic he apy
Imp o ed o al mic obio a
balance
In J Pedia ic
Heal h
5.1. Limi a ions and Challenges
5.1.1. Sho -Te m Coloniza ion
S. sali a ius K12 coloniza ion is ansien , equi ing egula supplemen a ion o sus ained bene i s.
5.1.2. E icacy Va iabili y
Indi idual di e ences in o al mic obio a may in luence e icacy. No all s ains o S ep ococcus sali a ius exhibi
p obio ic p ope ies.
5.1.3. Regula o y and S anda diza ion Issues
Lack o uni o m guidelines o p obio ic dosages and deli e y me hods complica es clinical use.
5.1.4. Cos and Accessibili y
High cos o p obio ic o mula ions may limi widesp ead adop ion in esou ce-limi ed se ings.
6. Fu u e Di ec ions
6.1. Pe sonalized P obio ic The apy
Tailo ing S. sali a ius K12 o mula ions o indi idual mic obio a p o iles.
6.2. Combina ion P obio ic Fo mula ions
Explo ing syne gis ic e ec s wi h o he p obio ic s ains.
6.3. Long-Te m S udies
Conduc ing la ge-scale, mul i-cen e RCTs o alida e e icacy in di e se popula ions.
6.4. Applica ions Beyond ENT
In es iga ing i s ole in sys emic diseases and immune egula ion.
7. Conclusion
S ep ococcus sali a ius K12 is a p omising p obio ic wi h di e se applica ions in pedia ic and gene al heal h. I s abili y
o p e en URTIs, o i is media, hali osis, and den al ca ies highligh s i s he apeu ic po en ial. Howe e , challenges such
as sho - e m coloniza ion and a iabili y in e icacy necessi a e u he esea ch. Wi h ongoing ad ancemen s in
p obio ic science, S. sali a ius K12 has he po en ial o become a co ne s one o p e en i e heal hca e.
Wo ld Jou nal o Biology Pha macy and Heal h Sciences, 2025, 21(01), 290-293
293
Re e ences
[1] Di Pie o F, Colombo M, e al. "E icacy o S. sali a ius K12 in educing URTIs in child en." Pedia ic In ec ious
Disease Jou nal, 2016.
[2] Ma chisio P, Esposi o S, e al. "S. sali a ius K12 and o i is media p e en ion." In e na ional Jou nal o Pedia ic
O o hinola yngology, 2020.
[3] Bu on JP, Chilco CN, e al. "P obio ic ea men o hali osis using S. sali a ius K12." O al Mic obiology and
Immunology, 2013.
[4] Tagg JR, Die ksen KP. "Bac e iocins o S. sali a ius K12 and hei ole in o al heal h." Mic obial Ecology in Heal h
and Disease, 2017.
[5] Guglielme i S, Ta e ni i V. "P obio ics in espi a o y ac in ec ions." In e na ional Jou nal o Pedia ic Heal h,
2019.
[6] Haukioja A. "P obio ic he apy in o al heal h." Jou nal o Clinical Den is y, 2015.
[7] Ouwehand AC, e al. "P obio ics in pedia ic heal h." Pedia ic Resea ch Re iews, 2018.
[8] Robe s MC. "Mic obial dynamics in o al heal h: P obio ic insigh s." Mic obiome Resea ch Jou nal, 2021.
[9] Ca alla i C, e al. "Role o p obio ics in immune modula ion." Cu en Opinion in Pedia ics, 2019.
[10] Yamanaka T, e al. "Fu u e o p obio ics in pedia ics." Ad ances in Pedia ic Heal h, 2022.
Au ho s sho Biog aphy
D . Venugopal Reddy is a dis inguished Medical Di ec o and Pedia ician a O um woman
and Child Speciali y Hospi al in Bangalo e, India. Wi h ex ensi e expe ise in pedia ic ca e,
esea ch, and communi y heal h ini ia i es, he has au ho ed 100 plus esea ch a icles in
Scopus and PubMed-indexed jou nals. He is ac i ely in ol ed in imp o ing heal hca e
sys ems, child heal h awa eness, and ma e nal well-being. His wo k has ea ned him
ecogni ion as one o he op p o essionals shaping heal hca e in India.
