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...