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Bacterial colonization and infection in the neonate
Insights
Neonates in intensive care are at high risk for hospital-acquired infections, primarily from antibiotic-resistant gram-negative bacilli. Bacterial interference may offer protective mechanisms against these infections.
Area of Science:
- Neonatal Medicine
- Infectious Diseases
- Microbiology
Background:
- Healthy neonates typically tolerate bacterial exposure well.
- Infants requiring prolonged hospitalization, especially in intensive care units (ICUs), face increased risks of nosocomial infections.
- Gram-negative bacilli are the primary cause of these infections in neonates.
Purpose of the Study:
- To investigate the risk factors and mechanisms of nosocomial infections in neonates.
- To understand the role of gram-negative bacilli colonization in neonatal infections.
- To explore potential protective factors like bacterial interference.
Main Methods:
- Analysis of nosocomial infection rates in neonatal intensive care units.
- Identification of common pathogens, particularly gram-negative bacilli.
- Investigation of colonization patterns (pharyngeal and intestinal) and transmission routes.
- Exploration of the role of alpha streptococci and bacterial interference.
Main Results:
- 15.3% of infants in one ICU acquired nosocomial infections.
- Gram-negative bacilli, often multidrug-resistant hospital strains, are the main culprits.
- Prolonged ICU stays increase the risk of colonization.
- Intestinal colonization with gram-negative bacilli can persist for over a year.
- Pharyngeal colonization with alpha streptococci may prevent gram-negative bacilli colonization.
Conclusions:
- Neonates in ICUs are vulnerable to gram-negative bacilli infections, often acquired through personnel contact.
- Bacterial interference, potentially mediated by organisms like alpha streptococci, may be a key factor in preventing colonization.
- Further research into bacterial interference could lead to novel infection control strategies.
Abstract:
The vast majority of healthy term neonates tolerate their abrupt introduction to the bacterial world with little risk of infection. However, infants who require a longer hospital stay are at greater risk of having an infection, particularly when intensive care is needed. In one study, 15.3 percent of the infants in an intensive care unit acquired a nosocomial infection. Gram-negative bacilli have emerged as the principle cause of nosocomial infection. Nosocomial infection due to gram-negative bacilli usually occurs in neonates already colonized with gram-negative bacilli in the pharynx or intestine, and the risk of colonization with hospital strains of gram-negative bacilli (which are often resistant to multiple antibiotics) increases dramatically the longer a baby stays in intensive care. The factors which predispose individual neonates to colonization and infection with gram-negative bacilli require further study, but gram-negative bacilli are most often transmitted among neonates on the hands of personnel. Neonates in whom intestinal colonization with gram-negative bacilli develops are a particularly important reservoir of gram-negative bacilli in the nursery; once colonized, infants may harbour antibiotic-resistant hospital strains of gram-negative bacilli in their stool for more than a year. Pharyngeal colonization with alpha streptococci appears to protect neonates from pharyngeal colonization with gram-negative bacilli, and bacterial interference may play an important role in regulating intestinal colonization as well. Investigation of the mechanisms of bacterial interference may lead to better understanding of the colonization process and development of alternatives to classic infection control methods.