Which bacterial disease is specifically confirmed by a serological method?

Correct option is D

The correct answer is: (D) Typhoid

• Typhoid is a bacterial infection caused by Salmonella typhi, and its diagnosis is often confirmed by serological methods.

• The Widal test is a commonly used serological method for diagnosing typhoid fever. It detects antibodies in the patient's blood that are produced in response to the infection by Salmonella typhi.

• Typhoid fever presents with symptoms such as fever, weakness, abdominal pain, and diarrhea or constipation.

• The Widal test is a diagnostic test where antigens of the bacteria are used to detect the presence of antibodies in the patient’s blood.

• The test has limitations, and blood cultures are often used in conjunction for more accurate diagnosis.

• Option A – Diphtheria: Diagnosed by clinical examination and laboratory testing for the diphtheria toxin, not serological methods.

• Option B – Pneumonia: Pneumonia is typically diagnosed by chest X-rays and sputum culture or blood culture, not through a serological test.

• Option C – Plague: Plague is confirmed by culturing the bacteria or identifying the bacteria in blood or tissue samples, not by serological tests.