A Fairy's Tale

Once upon a time I got jabbed, 
obtained a visa, 
hopped on a plane, 
spent months in a filthy slum, 
met new friends, 
ate questionable food
from questionable sources, 
stayed well, 
and came home in one piece
to tell the tales
In those days, 
people used to call that
"effective vaccines"
But times have changed 
and so has the "Science"