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...