Star Team

We think 2. Allegic Reaction cannot be classsify as a disease, it is just an adverse reaction to the bacteria he is exposed to. So, we've replaced it with Leptospirosis.

2. Leptospirosis is a disease cause by leptospira which is commonly found in rodents and dogs. They are capable of penetrating the skin through cuts or wounds. People are infected when exposed to water contaminated with infected animal's urine or when handling tissues of infected animals. Disease is most common in tropical months. Patients down with leptospirosis develop influenza-like illness with fever and myalgia(muscle pain) in the initial stage.

Reason: Patient's flat is infested with rats and he has a habit of feeding stray dogs and cats in which all these are the possible carriers of leptospira thus exposing himself to infection. There is also a high chance he may be exposed to the rats' urine and accidentally consumed water or food contaminated by them. Leptospirosis develop symptoms which are similar to what he is experiencing. Moreover, Singapore has a tropical climate which makes an optimum environment for Leptospirosis.

Source:
Medical Microbiology, 5th edition