Abstract
Neonatal mice succumbed to intranasally-inoculatedStreptococcus pneumoniae doses which were as much as 250 times less than the doses that adult mice were resistant to. Neutrophil migration into lungs of neonates was similar in kinetics and intensity to that in adults in response to lethal doses ofS. pneumoniae. Interestingly, neutrophil infiltration into the lung alveoli of neonates occured at lower doses of bacteria than that required for similar responses in adults. Furthermore, depletion of neutrophils in adult and neonatal mice inoculated with low doses of bacteria resulted in significantly higher lung burdens of bacteria in neonatal mice as compared to adults. These data indicate that increased susceptibility of neonates toS. pneumoniae is not the result of incompletely developed neutrophil function and infact, indicate that neutrophils contribute more to resistance to low doses ofS. pneumoniae in neonates than they do in adult mice.
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Garvy, B.A., Harmsen, A.G. The importance of neutrophils in resistance to pneumococcal pneumonia in adult and neonatal mice. Inflammation 20, 499–512 (1996). https://doi.org/10.1007/BF01487042
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DOI: https://doi.org/10.1007/BF01487042