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Lactobacillus kunkeei strains decreased the infection by honey bee pathogens Paenibacillus larvae and Nosema ceranae

in Beneficial Microbes
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D. Arredondo Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, CP 11600, Montevideo, Uruguay.

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L. Castelli Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, CP 11600, Montevideo, Uruguay.

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M.P. Porrini Centro de Investigación en Abejas Sociales, Departamento de Biología, CONICET, Universidad Nacional de Mar del Plata, Funes 3350, Mar del Plata, Argentina.

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P.M. Garrido Centro de Investigación en Abejas Sociales, Departamento de Biología, CONICET, Universidad Nacional de Mar del Plata, Funes 3350, Mar del Plata, Argentina.

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M.J. Eguaras Centro de Investigación en Abejas Sociales, Departamento de Biología, CONICET, Universidad Nacional de Mar del Plata, Funes 3350, Mar del Plata, Argentina.

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P. Zunino Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, CP 11600, Montevideo, Uruguay.

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K. Antúnez Departamento de Microbiología, Instituto de Investigaciones Biológicas Clemente Estable, Avda. Italia 3318, CP 11600, Montevideo, Uruguay.

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Due to their social behaviour, honey bees can be infected by a wide range of pathogens including the microsporidia Nosema ceranae and the bacteria Paenibacillus larvae. The use of probiotics as food additives for the control or prevention of infectious diseases is a widely used approach to improve human and animal health. In this work, we generated a mixture of four Lactobacillus kunkeei strains isolated from the gut microbial community of bees, and evaluated its potential beneficial effect on larvae and adult bees. Its administration in controlled laboratory models was safe for larvae and bees; it did not affect the expression of immune-related genes and it was able to decrease the mortality associated to P. larvae infection in larvae and the counts of N. ceranae spores from adult honey bees. These promising results suggest that this beneficial microorganism’s mixture may be an attractive strategy to improve bee health. Field studies are being carried out to evaluate its effect in naturally infected colonies.

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