| The high level of mortality and infectivity of pneumonic plague is the driving force for the development of new and more effective vaccines. |
| The level of infectivity in the ileum in both diseases is significant from an early stage of infection. |
| This will often result in incalculably small amounts of possible infectivity potentially remaining in the final product. |
| The low rate of infectivity may be attributable largely to the cuts of meat most likely to be eaten by humans. |
| The results confirmed widespread infectivity, toxicity and destruction among these cells, probably through apoptosis or programmed cell death. |
| In experimental infection where very high doses were administered, infectivity has been found in the ileum, part of the intestine. |
