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...