| They have been delivered intravascularly, intramuscularly, or transtracheally in a naked form or with the help of a vector, either viral or nonviral. |
| More than a decade of research into nonviral gene delivery has yielded a number of synthetic cationic lipids and polymers with transfection activity. |
| Trichomoniasis is the most prevalent nonviral sexually transmitted infection in humans worldwide. |
