ASCP Technologist in Microbiology (M) Practice Exam 2026 - Free Microbiology Practice Questions and Study Guide

Haemophilus aegyptius is primarily associated with conjunctivitis, commonly referred to as "pink eye." This organism is recognized as a leading cause of a highly contagious form of conjunctivitis, particularly in children and in certain endemic areas. The infection typically presents with symptoms such as redness, swelling of the conjunctiva, and discharge from the eyes, which aligns well with the condition known as pink eye.

While the other options present clinical manifestations associated with various bacterial infections, they are not primarily linked to Haemophilus aegyptius. For instance, pneumonia is often caused by different bacteria, such as Streptococcus pneumoniae or Klebsiella pneumoniae, and meningitis is commonly associated with pathogens like Neisseria meningitidis and Streptococcus pneumoniae. Sinusitis can be caused by various bacteria as well and is not specifically linked to Haemophilus aegyptius. Therefore, the clear association of Haemophilus aegyptius with conjunctivitis underscores why pink eye is considered a common clinical manifestation of this bacterium.