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8 bytes added ,  17:53, 22 November 2008
m
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**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
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**'''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''==
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