there  was  a crowdsourced vaccine,  
  that could be  created regionally by  
   most   pharmaceutical   companies    
   without  much effort,  and  it  was  
    estimated  that   it  had   saved   
       tens      of      millions.      
                                        
 but it  was not officially recognized by 
 the world  health organization,  and  as 
 such  did not give  what  the sanctioned 
 (and   unobtainable)   ones   did:   the 
 subskin chip that would  let  you  enter 
       (or     leave)     cities.       
                                        
  and that's why, eventually, we would  
   create our  own chips.  they  were   
  larger than the official ones, and a  
    little  unstable,   and   needed    
   maintenance.   but  they  worked!    
  or, they would work together with a   
  little something to make  the  guard  
      look     the    other    way.     
                                      
                                      
                                          
    but the scanner showed green, so...