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...