Animals: Rabies
Coughing/sneezing: Meningococcal meningitis
Food and/or water: Cholera, Hepatitis A, Travelers' diarrhea, Typhoid
Insect Bites: African Sleeping Sickness, Dengue, Filariasis, Leishmaniasis, Malaria, Onchocerciasis, Plague, Yellow fever
Sex/blood/needles: Hepatitis B, STDs & blood-borne diseases
Swimming/bathing: Schistosomiasis (bilharzia)