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What is the sample unit in the study? a) Blood samples from migrants. b) Migrants with or without malaria symptoms who stayed at the 'Casa del Mi...

What is the sample unit in the study?


a) Blood samples from migrants.
b) Migrants with or without malaria symptoms who stayed at the 'Casa del Migrante' in Tapachula.
c) Migrants who did not stay at the 'Casa del Migrante'.