Question

why did the measures adopted to prevent plague becomes ineffective in Vietnam

Answer 1

Steps taken by French to take care of the issue of torment in vietnam were:

The French began a huge rodent chase in 1902.

The French offered the Vietnamese money for getting the rodents.

Rodents were gotten in thousands, by May 30 alone 20,000 rodents were gotten, however the rodent threat did not end.

The French paid cash when the rodent catcher demonstrated a rodent tail as confirmation of a rodent slaughtered.