Table 2. Effect of Bifidobacterium probiotic strains on viral respiratory infections

Type of Bifidobacterium probiotic strains	Effect of anti-respiratory viruses	References
Bifidobacterium longum BB536	Anti-influenza A virus/PR/8/34 (H1N1) activity	[38]
Bifidobacterium animalis ssp. Lactis BB12	Reduce the number of cases of viral respiratory infections	[40]
Mixture of B. animalis ssp. Lactis BB12 and Lactobacillus reuteri ATCC DSM 1793	Reducing symptoms of viral respiratory infections, lowering fevers, and reducing antibiotic use	[41]
Mixture of Lactobacillus rhamnosus GG and B. animalis ssp. Lactis BB12	Reduce antibiotic consumption and reduce the incidence of acute otitis media during the first 7 months of life	[42]
Mixture of Lactobacillus acidophilus and B. bifidum	Reduction of symptoms of viral respiratory infections	[37]
Mixture of B. breve 99, L. rhamnosus GG, L. rhamnosus Lc705, and Propionibacterium freudenreichii JS	Effective against nasopharyngeal bocavirus infection	[44]