Line 70: |
Line 70: |
| **Immunity can wane in the absense of re-infection | | **Immunity can wane in the absense of re-infection |
| **Uninfected cattle remain susceptible | | **Uninfected cattle remain susceptible |
− |
| |
− | *Enzootic Instability
| |
− | **Low rate of transmission
| |
− | **Few infected [[Suborder: Metastigmata, ticks|ticks]]
| |
− | **Infrequent exposure
| |
− | **Immunity wanes or is completely absent in many individuals
| |
− | **Low levels of herd immunity
| |
− | **'''Higher''' incidence of disease
| |
− |
| |
− | *Enzootic Stability
| |
− | **High rate of transmission
| |
− | **Many infected ticks
| |
− | **Frequent exposure boosts immunity
| |
− | **High level of herd immunity
| |
− | **'''Lower''' incidence of disease
| |
| | | |
| *Predisposing factors: | | *Predisposing factors: |
Line 103: |
Line 88: |
| **''B. major'' occurs in South East England but is not pathogenic | | **''B. major'' occurs in South East England but is not pathogenic |
| ***Vector is [[Suborder: Metastigmata, ticks#Important Hard Ticks|''Haemaphysalis'']] | | ***Vector is [[Suborder: Metastigmata, ticks#Important Hard Ticks|''Haemaphysalis'']] |
| + | |
| + | ===Enzootic Instability=== |
| + | *Low rate of transmission |
| + | |
| + | *Few infected [[Suborder: Metastigmata, ticks|ticks]] |
| + | |
| + | *Infrequent exposure |
| + | |
| + | *Immunity wanes or is completely absent in many individuals |
| + | |
| + | *Low levels of herd immunity |
| + | |
| + | *'''Higher''' incidence of disease |
| + | |
| + | ===Enzootic Stability=== |
| + | *High rate of transmission |
| + | |
| + | *Many infected ticks |
| + | |
| + | *Frequent exposure boosts immunity |
| + | |
| + | *High level of herd immunity |
| + | |
| + | *'''Lower''' incidence of disease |
| | | |
| ==''Theileria''== | | ==''Theileria''== |