The main danger in dengue fever is low platelet counts and bleeding. So there should be regular monitoring of platelet count and he should be inder observation for any bleeding like petechiae, nasal bleed, bleeding from gums or from intestines. He should take paracetamol
for fever, plenty of fluids and rest. For typhoid fever
antibiotics like ofloxacin
can be used for which he should consult a physician so that both the conditions can be taken care of.