False Negative Results in Bartonellosis Diagnosis

Area of Science:

• Infectious Diseases
• Microbiology
• Clinical Diagnostics

Background:

• Bartonella henselae causes bartonellosis, a potentially severe infection.
• Accurate diagnosis of bartonellosis is crucial for timely treatment.
• Standard diagnostic methods include serology and PCR.

Observation:

• A fatal case of Bartonella henselae bacteremia was investigated.
• Initial diagnostic tests, including serology and whole blood PCR, were negative.
• A specific nested PCR targeting the ftsZ gene on blood culture was positive.

Findings:

• The blood culture isolate confirmed the presence of Bartonella henselae.
• Only the ftsZ nested PCR on blood culture provided a positive result.
• Standard diagnostic techniques failed to detect the bacteremia.

Implications:

• This case highlights the diagnostic challenges in Bartonella henselae infections.
• Technical limitations in current diagnostic assays can impede timely diagnosis.
• Advanced molecular techniques like nested PCR may be essential for detecting certain Bartonella cases.