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...