Related Experiment Videos
Escherichia coli infection in mice and impaired fetal development
Abstract:
Investigations were undertaken, using the mouse as an animal model, to study the effect of Escherichia coli on fetal development. The i.v. injection of 7.5 X 10(6) bacteria, originally obtained from a suspected case of human pyelonephritis, caused only a mild and transient disturbance of maternal health but caused severe fetal wastage. Groups of mice were examined 4, 7 and 11 days after infection and the numbers of organisms were determined in the spleen, liver, kidneys, placentas and resorptions. From the findings obtained, it was concluded that the Esch. coli grew preferentially in the placentas. By the 7th day the placentas showed marked degenerative and necrotic changes and the bacteria could be recovered from the majority of fetuses at this time. Histologically, no significant changes were seen in the spleen, liver and kidneys. As a result of these findings in an animal model, and taking into consideration the observations of other workers, it is suggested that coliform bacteraemia in human pregnancies may also cause infections of the placenta and bring about abortion or premature delivery.
Insights
Escherichia coli infection in mice caused severe fetal loss by targeting placentas. This suggests coliform bacteria may impact human pregnancy outcomes, leading to abortion or premature birth.
Area of Science:
- Microbiology
- Developmental Biology
- Obstetrics
Background:
- Escherichia coli (E. coli) is a common cause of urinary tract infections.
- Pregnancy complications can arise from bacterial infections.
- The impact of E. coli on fetal development requires further investigation.
Purpose of the Study:
- To investigate the effects of E. coli on fetal development in a mouse model.
- To determine the distribution and impact of E. coli within the maternal-fetal environment.
Main Methods:
- Intravenous injection of E. coli into pregnant mice.
- Quantification of bacterial load in maternal organs (spleen, liver, kidneys) and placental tissues at 4, 7, and 11 days post-infection.
- Histological examination of maternal organs and placentas.
Main Results:
- E. coli preferentially colonized placental tissues, causing significant degenerative and necrotic changes by day 7.
- Severe fetal wastage was observed despite only mild, transient maternal health disturbances.
- Bacteria were recovered from a majority of fetuses by day 7, with no significant histological changes in maternal spleen, liver, or kidneys.
Conclusions:
- The mouse model demonstrates that E. coli can severely impact fetal development, primarily through placental infection.
- Findings suggest a potential mechanism for coliform bacteraemia causing adverse pregnancy outcomes, including abortion and premature delivery, in humans.