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I found this article published in the “Dove Press” entitled, “An Update Review on Listeria Infection in Pregnancy.” It had this statement:

“Since 2004, Listeria infection monitoring across 10 regions of the USA shows that 17% of 760 Listeria infection cases were related to pregnancies, with a 29% incidence rate for fetal loss and neonatal fatalities.63 Improved perinatal outcomes could be related to the development of treatment capacity in neonatology and a better understanding of pregnancy-related listeriosis.

The criticalness of the influence on the fetus changed with the occurrence of maternal clinical presentations. According to a study performed in England and Wales from 1990 to 2010, pregnant women exhibiting symptoms are more likely to give birth to a stillbirth or have spontaneous miscarriage.64 It could be because most pregnant women exhibiting symptoms are in the early or second trimester of pregnancy, or an excessive quantity of Listeria exists in the body. Empirical guinea pig studies have confirmed that it takes nine days from the onset to the death of the fetus.65 The intermediate delay interval indicates that the bacteria need to colonize the placenta before infecting the fetus. In humans, although undiagnosed, LM might invade the placenta and cause intrauterine infection in asymptomatic parturient cases.”

You can read the entire article here:

https://www.dovepress.com/an-update-review-on-listeria-infection-in-pregnancy-peer-reviewed-fulltext-article-IDR

The association of Chorioamnionitis to Placental Abruption is given in this one of many articles on the subject. It is published by the National Center for Bioitechnology Information. The article, entitled, “Diagnosis and Management of Clinical Chorioamnionitis,” has these words:

“Several other conditions should be considered in the differential diagnosis of chorioamnionitis. In the intrapartum patient with an epidural and low-grade fever without tachycardia (maternal or fetal) or other clinical signs of intrauterine inflammation, epidural-associated fever is a strong consideration. Extrauterine infections can cause fever and abdominal pain, either during or in absence of labor, including urinary tract infection (pyelonephritis), influenza, appendicitis, and pneumonia. Non-infectious conditions associated with abdominal pain (usually in absence of fever) include thrombophlebitis, round ligament pain, colitis, connective tissue disorders and placental abruption.”