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Naturally acquired immunity to pneumonia due to Mycoplasma pneumoniae
Abstract:
The immunity to Mycoplasma pneumoniae was studied by periodic collection of sera up to 15 years after infection. Sera were tested for antilipid antibodies by complement fixation. Antibody levels remained elevated for two to nine years after pneumonia but usually fell sharply after the second year in persons with milder symptoms. Infection rates were at least six times higher in comparison groups than in previous pneumonia patients. Schoolchildren with serologic evidence of infection, but without pneumonia, during the 1966-1967 epidemic were not protected during the next epidemic (1974). Children with evidence of infection during the first two years of life were at no higher risk of clinical pneumonia (immunopathological response) at school age than those without previous known exposure. The current study suggests that naturally acquired infection induces partial immunity which lasts longer after pneumonia than after mild infections.
Insights
Immunity to Mycoplasma pneumoniae infection wanes over time, especially after mild cases. Natural infection provides partial, but not complete, long-term protection against reinfection and pneumonia.
Area of Science:
- Immunology
- Infectious Diseases
- Microbiology
Background:
- Mycoplasma pneumoniae causes respiratory illness.
- Understanding long-term immunity after infection is crucial for public health.
Purpose of the Study:
- To investigate the duration and effectiveness of natural immunity to Mycoplasma pneumoniae.
Main Methods:
- Sera collected periodically up to 15 years post-infection.
- Tested for antilipid antibodies using complement fixation.
Main Results:
- Antibody levels persisted 2-9 years after pneumonia, but declined faster after milder symptoms.
- Individuals with prior infection had lower reinfection rates.
- Previous infection did not fully prevent subsequent pneumonia or infection.
Conclusions:
- Naturally acquired Mycoplasma pneumoniae infection induces partial immunity.
- Immunity is more durable after pneumonia than after mild infections.
- Long-term protection is incomplete.