A country has fewer than 2.5 deaths per 100000 people from TB in one year and the next year this rose to 25 deaths per 100000.
What may have contributed to this change?
1 decrease in contact tracing
2 increase in refugee camps
3 water supply contaminated by sewage
1 and 2
2 )
1 and 3
3 )
2 and 3
4 )
1, 2 and 3
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