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...