SummaryLactobacillusLactobacillusFor aging adults, viral cold or flu infections can cause catastrophic disability and lead to bacterial infections such as pneumonia. Flu and pneumonia kill over 57,000 Americans each year.Robust defenses against respiratory infection require optimal secretory immunity, which depends in large part on antibodies known as IgA.Six specific strains of orally ingested probiotic bacteria have been shown to stimulate the body’s production of IgA, which protects the delicate mucous membranes, and ultimately helps prevent the virus replication cycle.Human studies demonstrate that using these six strains of bacteria can reduce the incidence of colds and flu-like illnesses, an effect largely attributable to enhanced levels of IgA.If you have any questions on the scientific content of this article, please call a Life Extension® Wellness Specialist at 1-866-864-3027.