Answer:
governments adopted measures in an attempt to try to prevent the spread of catastrophic epidemics
Step-by-step explanation:
In order to mitigate the poor living conditions in the cities , the governments have to adopt measures in an attempt to try to prevent the spread of catastrophic epidemics.
Fortunately, control programmes are already long-established and widely-applied for some known epidemic diseases, such as cholera, HIV infection, influenza, meningitis, malaria, tuberculosis and yellow fever. However, even if medical countermeasures are available, these diseases remain a threat for many of the world’s populations, either because of their rapidly evolving nature.
Epidemics are complex events, complex in their origins, their spread, their effects and their consequences ,which can be at one and the same time medical, social, political and economic.