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Haemophilus aegypticus – Pathogen, Symptoms and Treatment

Haemophilus aegypticus is a gram-negative bacterium that causes purulent conjunctivitis and Brazilian Purpuric Fever, primarily affecting children in tropical regions.

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Things worth knowing about "Haemophilus aegypticus"

Haemophilus aegypticus is a gram-negative bacterium that causes purulent conjunctivitis and Brazilian Purpuric Fever, primarily affecting children in tropical regions.

What is Haemophilus aegypticus?

Haemophilus aegypticus is a gram-negative, rod-shaped bacterium belonging to the genus Haemophilus. It was first described in the late 19th century by Robert Koch and John E. Weeks and is therefore also known as the Koch-Weeks bacillus. The bacterium colonizes the mucous membranes of the human conjunctiva (the thin membrane covering the white of the eye) and the upper respiratory tract.

Causes and Transmission

Transmission of Haemophilus aegypticus typically occurs through direct or indirect contact with infected eye secretions, for example via contaminated hands, shared towels, or flies acting as mechanical vectors. The bacterium is most prevalent in tropical and subtropical regions where sanitary conditions are limited and temperatures are high. Outbreaks tend to occur particularly during warm and humid seasons.

Clinical Manifestations

Purulent Conjunctivitis (Pink Eye)

The most common manifestation of a Haemophilus aegypticus infection is acute, highly contagious purulent conjunctivitis, also known as pink eye or Egyptian ophthalmia. It predominantly affects children and presents with the following symptoms:

Marked redness and swelling of the conjunctiva
Purulent, yellowish-green discharge from the eye
Burning, itching, and sensitivity to light
Crusting of the eyelids, especially upon waking

Brazilian Purpuric Fever (BPF)

Brazilian Purpuric Fever (BPF) is a particularly dangerous complication first described in Brazil in 1984. It is a systemic infection that mainly affects children from a few months to approximately 10 years of age. Following a preceding episode of conjunctivitis, the bacterium can spread into the bloodstream and cause a life-threatening illness. Symptoms include:

High fever
Purpura (scattered skin hemorrhages)
Chills and vomiting
Septic shock in severe cases
High mortality rate without timely treatment

Diagnosis

Diagnosis of a Haemophilus aegypticus infection is established through microbiological examination. A swab is taken from the conjunctiva or blood and cultured on appropriate growth media. A Gram stain of the swab reveals gram-negative rods. Molecular methods such as PCR (polymerase chain reaction) allow rapid and precise identification of the pathogen, particularly when Brazilian Purpuric Fever is suspected.

Treatment

Treatment depends on the severity of the infection:

Uncomplicated conjunctivitis: Topical antibiotic eye drops or ointments, such as chloramphenicol or azithromycin, are usually sufficient. Strict hygiene measures, including frequent handwashing, are essential to prevent further spread.
Brazilian Purpuric Fever: As a systemic, life-threatening infection, immediate hospitalization and intravenous antibiotic therapy are required. Third-generation cephalosporins or ampicillin are the agents of choice, depending on the resistance profile of the pathogen.

Prevention

Preventive measures include thorough hand hygiene, avoiding sharing towels and eye-care items, and prompt treatment of conjunctivitis. In endemic areas, public education about transmission routes and hygiene practices is especially important in reducing the spread of this bacterium.

References

Brazilian Purpuric Fever Study Group. Brazilian purpuric fever: epidemic purpura fulminans associated with antecedent purulent conjunctivitis. The Lancet, 1987;2(8548):757-761.
Mandell, G. L., Bennett, J. E., Dolin, R. (eds.). Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases. 8th edition. Elsevier, 2015.
World Health Organization (WHO). Bacterial eye infections – Overview and management guidelines. Geneva: WHO, 2022. Available at: https://www.who.int

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