This question is about a businessman who travels a lot during the work week days. He visits his doctor due to the fact that he thinks he has the flu. Some of the symptoms that he experiences are diarrhea, fatigue, headache and high fever.
Dr. Miller asked him if he recently stayed in a hotel with air conditioning working which he agreed to. This supported the doctors suspicion because staying in a hotel as well as conferences are done in environments or places that are enclosed. Such areas have a higher risks of transmission due to reasons such as meeting different people, and also staying a room that is air conditioned. Air condition makes the temperature in a room to fall, this can make the body prone to having the flu virus.
Toxoplasmosis is a disease that is a result of interaction with a bacteria that bears a similar name. Amoebae are unicellular organism that can change shape. Malaria is a disease that is primarily spread by infected mosquitos. Tapeworms are a type of worm/parasite that comes from eating or drinking contaminated food and/or drink that can live for 20 years and grow to 50 feet in length. The only one that matches the question description is tapeworms, so that'd be the answer.
Cardiovascular disease would be the most likely as the oxygen taken in is polluted and enters the blood stream. Thus as it travels to the heart and throughout your body you risk disease.