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Changes in the epidemiological pattern of Mycoplasma pneumoniae infections in Denmark. A 30 years survey
1Mycoplasma Laboratory, Statens Seruminstitut, Copenhagen, Denmark.
Abstract:
A seroepidemiological survey has shown a remarkable shift in the previously reported regular cyclic pattern of Mycoplasma pneumoniae epidemics which culminated every 4.5 years during the period 1958-74. The last of four regular epidemics occurred in 1972. It was followed by 'premature' epidemics in 1975 and 1977/8 which inaugurated a change from an epidemic to an endemic pattern of the infection in Denmark. Over the following 9 years (1978-86) there has been an irregular but significant decrease in the annual number of seropositive samples with the usual high incidence during winter seasons. This endemic period terminated in the fourth trimester of 1987 with the development of a new epidemic. The hypothesis is advanced that a sixfold increase of children in day care may have influenced the change from an epidemic to an endemic situation which after 9 years led to a new epidemic of M. pneumoniae infection.
Insights
Mycoplasma pneumoniae epidemics shifted from regular cycles to an endemic pattern in Denmark, potentially due to increased daycare attendance. A new epidemic emerged after nine years of endemicity.
Area of Science:
- Epidemiology
- Infectious Diseases
- Public Health
Background:
- Mycoplasma pneumoniae infections historically followed regular epidemic cycles in Denmark.
- The last regular epidemic occurred in 1972, followed by irregular outbreaks.
- A shift from epidemic to endemic patterns was observed starting in 1975.
Purpose of the Study:
- To analyze the changing patterns of Mycoplasma pneumoniae infections in Denmark.
- To investigate the transition from epidemic to endemic states of the infection.
- To explore potential factors influencing these epidemiological shifts.
Main Methods:
- Seroepidemiological survey data from Denmark.
- Analysis of temporal trends in Mycoplasma pneumoniae seropositivity.
- Correlation of infection patterns with potential environmental or demographic factors.
Main Results:
- A shift from a 4.5-year epidemic cycle to an endemic pattern occurred between 1975 and 1987.
- A significant decrease in annual seropositive samples was noted during the endemic period.
- A new epidemic of Mycoplasma pneumoniae infection began in late 1987.
Conclusions:
- Increased children in daycare attendance is hypothesized as a factor in the shift to endemicity.
- The endemic period lasted approximately nine years before a new epidemic emerged.
- Epidemiological surveillance is crucial for understanding and managing Mycoplasma pneumoniae infections.