| 1 | Most injected vaccines don't provide mucosal immunity. | |
| 2 | Viral conjunctivitis is an infection of the mucous membrane of the surface of the eye. | |
| 3 | Surgeons can cut away bone and membranes that block sinuses. | |
| 4 | Bacterial conjunctivitis is a microbial infection involving the mucous membrane on the surface of the eye. | |
| 5 | Research suggests that the risk of HIV infection after mucous membrane exposure is less than 1 in 1000. |