Respiratory Tract Infections

Legionella pneumophila: Properties, Pathogenesis, Lab Diagnosis

Legionella pneumophila: Properties, Pathogenesis, Lab Diagnosis

Legionella is a gram-negative pleomorphic rod, responsible for a serious type of pneumonia called Legionnaires' disease.

Laboratory Diagnosis of Mycobacterium tuberculosis Infection

Laboratory Diagnosis of Mycobacterium tuberculosis Infection

Ziehl-Neelsen staining, culture in Lowenstein-Jensen medium and GeneXpert MTB/RIF assay are useful methods for the diagnosis of tuberculosis.

Mycoplasma pneumoniae: Properties, Disease, Diagnosis

Mycoplasma pneumoniae: Properties, Disease, Diagnosis

This smallest free-living bacteria does not have cell wall (so pleomorphic in shape) causes walking pneumonia.

Sputum Sample: Collection, Transport, Staining, and Culture 

Sputum Sample: Collection, Transport, Staining, and Culture 

The first morning expectorated sputum sample is always best for the diagnosis of lower respiratory tract infections.

Haemophilus influenzae: Characteristics, Pathogenesis and Lab Diagnosis

Haemophilus influenzae: Characteristics, Pathogenesis and Lab Diagnosis

Gram-negative, oxidase-positive, coccobacilli, which requires X and V factors for the growth.

Streptococcus pneumoniae: Properties, Pathogenesis, and Diagnosis

Streptococcus pneumoniae: Properties, Pathogenesis, and Diagnosis

Pneumococcus is lanceolate shaped gram-positive cocci and causes pneumonia and meningitis. Its is optochin sensitive and bile soluble.