In legionellosis, which statement is true?

In legionellosis, which statement is true?

• A. Person-to-person transmission is common
• B. Farm animals are important reservoirs
• C. Patients can present with a self-limited nonpneumonic febrile illness
• D. Specimens may be cold enriched to enhance recovery

Answer: (C)

Legionellosis can present as Pontiac fever, a self-limited febrile illness without pneumonia. This form contrasts with Legionnaires’ disease, which is a pneumonic infection. Transmission occurs by inhalation of aerosols from environmental water sources, not by person-to-person spread. The bacteria dwell in aquatic environments and within amoebae, not in farm animals. Lab recovery relies on culture on specialized media (such as buffered charcoal yeast extract with cysteine and iron) or detection by urinary antigen tests; cold enrichment is not a standard method used to enhance Legionella recovery. So, the statement that patients can present with a self-limited nonpneumonic febrile illness is true.

Legionellosis can present as Pontiac fever, a self-limited febrile illness without pneumonia. This form contrasts with Legionnaires’ disease, which is a pneumonic infection. Transmission occurs by inhalation of aerosols from environmental water sources, not by person-to-person spread. The bacteria dwell in aquatic environments and within amoebae, not in farm animals. Lab recovery relies on culture on specialized media (such as buffered charcoal yeast extract with cysteine and iron) or detection by urinary antigen tests; cold enrichment is not a standard method used to enhance Legionella recovery. So, the statement that patients can present with a self-limited nonpneumonic febrile illness is true.