A public health crisis has, through travel, resulted in a large number of imported cases in several countries, which progressively set off local outbreaks through gradual but large-scale community transmission.
Minħabba l-ivvjaġġar, din il-kriżi tas-saħħa pubblika rriżultat f'għadd kbir ta' każijiet importati f'diversi pajjiżi, li progressivament skattaw tifqigħat lokali permezz ta' trażmissjoni komunitarja gradwali, iżda fuq skala kbira.