Listeriosis in Christchurch 1967-1984

Area of Science:

• Infectious Diseases
• Microbiology
• Public Health

Background:

• Listeria monocytogenes is a bacterium known to cause severe infections, particularly in vulnerable populations.
• Prior to 1981 and after May 1982, infections caused by this organism were infrequent in Christchurch.
• A notable cluster of Listeria monocytogenes infections occurred in Christchurch between February 1981 and May 1982.

Purpose of the Study:

• To report on a series of Listeria monocytogenes infections in Christchurch.
• To highlight the clinical outcomes, including mortality and pregnancy complications.
• To investigate potential sources of the outbreak and discuss implications.

Main Methods:

• Retrospective case review of patients diagnosed with Listeria monocytogenes infection.
• Analysis of patient demographics, clinical presentation, and outcomes.
• Epidemiological investigation to identify potential sources and transmission routes.

Main Results:

• Eighteen patients were infected with Listeria monocytogenes between February 1981 and May 1982.
• Among eight pregnant patients, there were three mid-trimester abortions and one neonatal death.
• One death occurred in the ten non-pregnant patients; three patients were part of a nosocomial outbreak.

Conclusions:

• Listeria monocytogenes infections can lead to severe maternal and neonatal complications.
• Nosocomial transmission may play a role in outbreaks.
• The findings underscore the importance of surveillance and control measures for Listeria monocytogenes.