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...