Which of the following might have caused Sam to contract malaria?  Place a check by EVERY correct answer.
1
Sam was bitten by a mosquito.
Sam was not bitten by a mosquito.
Sam has the sickle cell gene.
Sam does not have the sickle cell gene.
Sam got an innoculation.
Sam did not get an innoculation.
Sam drank gin and tonics.
Sam did not drink gin and tonics.