These cells are involved in recognizing «foreign», potentially harmful materials like infectious microorganisms, helping destroy them and then providing protection (immunity) against future attack. (michigananimalhospital.com)
There these beneficial bacteria continue to compete against the overgrowth of infectious microorganisms such as Staphylococcus aureus and Salmonella enterica (commonly trigger food poisoning), Candida albicans (cause bloating and yeast infections), Helicobacter pylori (overgrowth can lead to chronic gastritis and ulcers) and Clostridium difficile (can cause colitis and diarrhea). (greenpasture.org)
Antibodies attach to infectious microorganisms so that rest of the immune system can recognize the infection and destroy it. (drvitaminsolutions.com)