<prompt> Person having heterozygous sickle cell trait are protected from infection of:P. falciparumP. vivaxPneumococcousSalmonella  <response>: - People who are heterozygous to sickle cell trait HbS are protective against plasmodium falciparum,. - In this condition, parasites grow poorlydie dtlow oxygen concentrations. Conditions providing protection against malaria G6PD deficiency Thalassemia Sickle cell disease Absence of DUFFY antigen Pyruvate kinase deficiency HbC 