I remember queueing up about 1957 outside a health centre on, I think, the Donegal Road to get the suger lump.
Because of the outbreak and that a near neighbour friend my age had caught it a few years earlier, my mother was worried and we went on probably the first day.
It was spread by digesting fecal matter and swimming in rivers such as the Lagan would not have been be advised, in view of the tendency for rural cesspits overflowing into local rivers and streams.
Wuz