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...