| Concern has centered on the risk of introducing novel pathogens derived from animals into human recipients of xenografts. |
| Numerous investigators have studied the etiologic pathogens associated with otitis media in children. |
| Additionally, the project has shown the potential for using fungal pathogens to control other African weeds, including speargrass and witchweed. |
| The etiologic spectrum of pathogens was broad, including opportunistic as well as bacterial agents. |
| The most recently released agents have significant antimicrobial activity against gram-positive streptococci, atypical pathogens and anaerobes. |
| Plants have developed elaborate mechanisms to protect themselves from invading pathogens and aggressors. |
