which one has been the most effective and which one the least effective?

There are five key engineering methods developed to reduce or eliminate the spread of infection and disease. How effective do you think these methods have been? Of these methods, which one has been the most effective and which one the least effective? Why? Justify your answers with appropriate research and reasoning and comment on the postings of at least two peers.

 

references r needEd in apa format please

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