The three steps taken to solve the problem of plague in Vietnam are given below:
(i) Rat hunt was started in 1902. The French hired Vietnamese workers and paid them for each rat they caught.
(ii) Bounty programme was started. Those who did the dirty work of entering sewers could negotiate a bounty. The bounty was paid when a tail was given as a proof that a rat had been killed.
(iii) Clearing of the large sewers on a regular basis as they had become an ideal and protected breeding ground for rats.
