A form of IG that protects mucosal surfaces from invasion of bacteria.
                                                            
                                                     
                        
                                                
                        
                        
                            Antibody types secreted into body fluids such as tears and saliva.
                                                            
                                                     
                        
                                                
                        
                        
                            principal antibody found in body secretions
                                                            
                                                     
                        
                                                
                        
                        
                        
                                                
                        
                        
                            an antibody in the colon that binds food and bacterial antigens.
                                                            
                                                     
                        
                                                
                        
                        
                            an immunoglobulin found in blood, tears, saliva, and in the mucous membranes of the respiratory and intestinal tracts.
                                                            
                                                     
                        
                                                
                        
                        
                            antibodies IgA has anti viral properties. Its production is stimulated by aerosol immunizations and oral vaccines.