Selenium reacts with fluorine to form selenium hexafluoride:

  
    
      
        
          
            Se
            
              8
            
            
              
            
          
          +
          24
          
          
            F
            
              2
            
            
              
            
          
          ⟶
          8
          
          
            SeF
            
              6
            
            
              
            
          
        
      
    
    {\displaystyle {\ce {Se8 + 24 F2 -> 8 SeF6}}}
  In comparison with its sulfur counterpart (sulfur hexafluoride), selenium hexafluoride (SeF6) is more reactive and is a toxic pulmonary irritant.
Pseudocowpox is a disease caused by the Paravaccinia virus or Pseudocowpox virus, a virus of the family Poxviridae and the genus Parapoxvirus. : 393  Humans can contract the virus from contact with livestock infected with Bovine papular stomatitis and the disease is common among ranchers, milkers, and veterinarians. Infection in humans will present with fever, fatigue, and lesion on the skin. Signs and symptoms
Paravaccinia virus presents itself with blisters, nodules, or lesions about 4 mm in diameter, typically in the area that has made contact with livestock that is infected with bovine papular stomatitis. Lesions may begin forming as late as three weeks after contact has been made with an infected animal. In rare cases, lesions may be seen systemic. General signs of infection are also common, such as fever and fatigue. Infected livestock may present with blisters or lesions on their udders or snout. Often, however, infected livestock show little to no symptoms. Mechanism
Paravaccinia is a member of the Parapoxvirus family. It has a cylindrical body about 140 X 310 nm in size, with convex ends covered in a criss-cross pattern of rope like structures. The virus is resistant to cold, dehydration, and temperatures up to 56 °C. Upon injecting a cell with its genome, the virus begins transcription in the cytoplasm using viral RNA polymerase. As the virus progresses through the cell, the host begins to replicate the viral genome between 140 minutes and 48 hours. Diagnosis
Diagnosis of paravaccinia virus will often come from Polymerase chain reaction screening ordered by their physician.