Two days after returning from a 1-week trip around Thailand, a 25-year-old woman presents with sudden onset of fever, headache and severe myalgia. Three days after her symptoms started she develops a generalized erythematous rash. Her Hb is 12g/dl, WCC 2.1x109/l and platelets 65x109/l. What is the most likely diagnosis? A : Plasmodium vivax malaria B : Typhoid fever C : Paratyphoid fever D : Dengue fever E : Tick-borne encephalitis.