Static pressure and stagnation pressure are related by:

  
    
      
        
          p
          
            0
          
        
        =
        
          
            1
            2
          
        
        ρ
        
          v
          
            2
          
        
        +
        p
      
    
    {\displaystyle p_{0}={\frac {1}{2}}\rho v^{2}+p}
  where 

  
    
      
        
          p
          
            0
          
        
      
    
    {\displaystyle p_{0}}
   is the stagnation pressure,

  
    
      
        ρ
      
    
    {\displaystyle \rho }
   is the density,

  
    
      
        v
      
    
    {\displaystyle v}
   is the flow velocity,

  
    
      
        p
      
    
    {\displaystyle p}
   is the static pressure.The pressure of a moving fluid can be measured using a Pitot tube, or one of its variations such as a Kiel probe or Cobra probe, connected to a manometer.
If possible, the animal from which the bite was received should also be examined for rabies.Some light microscopy techniques may also be used to diagnose rabies at a tenth of the cost of traditional fluorescence microscopy techniques, allowing identification of the disease in less-developed countries. A test for rabies, known as LN34, is easier to run on a dead animals brain and might help determine who does and does not need post-exposure prevention. The test was developed by the CDC in 2018.The differential diagnosis in a case of suspected human rabies may initially include any cause of encephalitis, in particular infection with viruses such as herpesviruses, enteroviruses, and arboviruses such as West Nile virus. The most important viruses to rule out are herpes simplex virus type one, varicella zoster virus, and (less commonly) enteroviruses, including coxsackieviruses, echoviruses, polioviruses, and human enteroviruses 68 to 71.New causes of viral encephalitis are also possible, as was evidenced by the 1999 outbreak in Malaysia of 300 cases of encephalitis with a mortality rate of 40% caused by Nipah virus, a newly recognized paramyxovirus. Likewise, well-known viruses may be introduced into new locales, as is illustrated by the outbreak of encephalitis due to West Nile virus in the eastern United States. Prevention
Almost all human exposure to rabies was fatal until a vaccine was developed in 1885 by Louis Pasteur and Émile Roux. Their original vaccine was harvested from infected rabbits, from which the virus in the nerve tissue was weakened by allowing it to dry for five to ten days.