Although probiotics are generally safe, when they are used by oral administration there is a small risk of passage of viable bacteria from the gastrointestinal tract to the blood stream (bacteremia), which can cause adverse health consequences. Some people, such as those with a compromised immune system, short bowel syndrome, central venous catheters, cardiac valve disease and premature infants, may be at higher risk for adverse events.
Lactobacillus acidophilus
Bifidobacterium breve
Bifidobacterium longum
Campylobacter upsaliensis
Bifidobacterium
Helicobacter pylori
Prevotella bivia
Escherichia coli O157:H7