**Question:** Typhoid in 1st week is best diagnosed by

A. Fever
B. Sweating
C. Splenomegaly
D. Bacteremia

**Correct Answer:** A. Fever

**Core Concept:**
Typhoid fever, also known as salmonellosis, is a bacterial infection caused by the bacterium Salmonella enterica serovar Typhi. The disease primarily affects the gastrointestinal tract but can also lead to systemic complications. The initial phase of typhoid fever typically presents within the first week of infection and is characterized by the following symptoms:

**Why the Correct Answer is Right:**
In the first week of typhoid fever, fever is the most prominent symptom. Salmonella Typhi colonizes the Peyer's patches in the ileum, causing inflammation and releasing pyrogens, which subsequently lead to fever. The fever is typically high-grade, persistent, and often accompanied by a characteristic "saturnine" curve, with a gradual increase in temperature in the morning and a rapid fall in the evening.

**Why Each Wrong Option is Incorrect:**

A. Sweating (Option B): While sweating can be present in typhoid fever, it is not a specific symptom and can be present in other febrile illnesses as well.

C. Splenomegaly (Option C): Splenomegaly is often present in typhoid fever, but it is not a specific feature and can be seen in other infections or diseases as well.

D. Bacteremia (Option D): Bacteremia is a feature of typhoid fever, but it is not the primary symptom that helps in diagnosing the disease in the first week. The core symptom is fever, which is more reliable for diagnosis.

**Clinical Pearl:**
In the early stages of typhoid fever, fever is the cornerstone of diagnosis. The characteristic presentation, high grade fever with a "saturnine" pattern, along with supportive clinical findings such as splenomegaly, hepatomegaly, and leucocytosis, can help clinicians suspect the diagnosis. Further laboratory investigations, including blood culture, stool culture, and serology, are necessary for definitive diagnosis.