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