Why is it difficult to control the spread of tuberculosis?
1) Global air travel for commerce and tourism has increased.
2) The bacterium that causes tuberculosis has evolved resistance to some antibiotics.
3) The bacterium that causes tuberculosis shows great antigenic variability.
4) Civil unrest and poverty result in overcrowded living conditions.
1, 2 and 4
2 )
1 and 4 only
3 )
2 and 3
4 )
4 only
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