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Most bacterial infections are caused by organisms that have already colonized the host. Bacterial attachment to pharyngeal cells and proliferation may be necessary to infect the lower respiratory tract or middle ear. We investigated the incidence of pathogenic bacteria isolated from the throat of healthy infants with different feeding methods. The protecting role of breastmilk is also discussed. The incidence of respiratory bacterial pathogens isolated from the oropharynx of 113 normal infants with different feeding methods was investigated. Group A β haemolytic  Streptococcus, Streptococcus pneumoniae, Haemophilus influenzae  and  Moraxella catarrhalis  were selected as respiratory bacterial pathogens. No respiratory bacterial pathogens were detected in breastfed and mixed-fed infants.  Haemophilus influenzae  and  Moraxella catarrhalis  were isolated from the oropharynx of formula-fed infants. The incidence of respiratory bacterial pathogens did not differ among infants with different feeding methods. These results suggest that breastmilk may inhibit the colonization by respiratory bacterial pathogens of the throat of infants, by enhancing mucosal immunity against respiratory tract infection.

Brief report. Isolation of respiratory bacterial pathogens from the throats of healthy infants fed by different methods