Pentru fiecare bolnav cunoscut există cel puţin alte 5 persoane care nu sunt investigate, nu sunt cunoscute ca bolnavi, dar reprezintă o importantă sursă de infecţie.
For every ill known there are at least 5 other people who are not being investigated, are not known as sick, but represent an important source of infection.
For each ill known there is at least another 5 persons who are not investigated, are not known as sick, but it also represents an important source of infection.