Comparison of Delivery Methods in Phage Therapy against Flavobacterium columnare Infections in Rainbow Trout
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Comparison of Delivery Methods in Phage Therapy against Flavobacterium columnare Infections in Rainbow Trout. / Kunttu, Heidi M. T.; Runtuvuori-Salmela, Anniina; Middelboe, Mathias; Clark, Jason; Sundberg, Lotta Riina.
In: Antibiotics, Vol. 10, No. 8, 914, 2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Comparison of Delivery Methods in Phage Therapy against Flavobacterium columnare Infections in Rainbow Trout
AU - Kunttu, Heidi M. T.
AU - Runtuvuori-Salmela, Anniina
AU - Middelboe, Mathias
AU - Clark, Jason
AU - Sundberg, Lotta Riina
N1 - Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2021
Y1 - 2021
N2 - Viruses of bacteria, bacteriophages, specifically infect their bacterial hosts with minimal effects on the surrounding microbiota. They have the potential to be used in the prevention and treatment of bacterial infections, including in the field of food production. In aquaculture settings, disease-causing bacteria are often transmitted through the water body, providing several applications for phage-based targeting of pathogens, in the rearing environment, and in the fish. We tested delivery of phages by different methods (via baths, in phage-coated material, and via oral delivery in feed) to prevent and treat Flavobacterium columnare infections in rainbow trout fry using three phages (FCOV-S1, FCOV-F2, and FCL-2) and their hosts (FCO-S1, FCO-F2, and B185, respectively). Bath treatments given before bacterial infection and at the onset of the disease symptoms were the most efficient way to prevent F. columnare infections in rainbow trout, possibly due to the external nature of the disease. In a flow-through system, the presence of phage-coated plastic sheets delayed the onset of the disease. The oral administration of phages first increased disease progression, although total mortality was lower at the end of the experiment. When analysed for shelf-life, phage titers remained highest when maintained in bacterial culture media and in sterile lake water. Our results show that successful phage therapy treatment in the aquaculture setting requires optimisation of phage delivery methods in vivo.
AB - Viruses of bacteria, bacteriophages, specifically infect their bacterial hosts with minimal effects on the surrounding microbiota. They have the potential to be used in the prevention and treatment of bacterial infections, including in the field of food production. In aquaculture settings, disease-causing bacteria are often transmitted through the water body, providing several applications for phage-based targeting of pathogens, in the rearing environment, and in the fish. We tested delivery of phages by different methods (via baths, in phage-coated material, and via oral delivery in feed) to prevent and treat Flavobacterium columnare infections in rainbow trout fry using three phages (FCOV-S1, FCOV-F2, and FCL-2) and their hosts (FCO-S1, FCO-F2, and B185, respectively). Bath treatments given before bacterial infection and at the onset of the disease symptoms were the most efficient way to prevent F. columnare infections in rainbow trout, possibly due to the external nature of the disease. In a flow-through system, the presence of phage-coated plastic sheets delayed the onset of the disease. The oral administration of phages first increased disease progression, although total mortality was lower at the end of the experiment. When analysed for shelf-life, phage titers remained highest when maintained in bacterial culture media and in sterile lake water. Our results show that successful phage therapy treatment in the aquaculture setting requires optimisation of phage delivery methods in vivo.
KW - Aquaculture
KW - Bacterial infection
KW - Bacteriophage
KW - Columnaris disease
KW - Flavobacterium columnare
KW - Phage delivery
KW - Phage therapy
KW - Rainbow trout
KW - Treatment
KW - Virulence
U2 - 10.3390/antibiotics10080914
DO - 10.3390/antibiotics10080914
M3 - Journal article
C2 - 34438964
AN - SCOPUS:85111907577
VL - 10
JO - Antibiotics
JF - Antibiotics
SN - 2079-6382
IS - 8
M1 - 914
ER -
ID: 279138673