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 Table of Contents  
ORIGINAL ARTICLE
Year : 2017  |  Volume : 34  |  Issue : 1  |  Page : 6-10

Ebola virus disease and pregnancy outcome: A review of the literature


1 Department of Medicine, College of Health Science, Bayero University, Kano, Nigeria
2 Department of Obstetrics and Gynaecology, Abubakar Tafawa Balewa University, Bauchi, Nigeria

Date of Web Publication26-May-2017

Correspondence Address:
Lamaran M Dattijo
Department of Obstetrics and Gynaecology, Abubakar Tafawa Balewa University, Bauchi
Nigeria
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/TJOG.TJOG_3_17

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  Abstract 

Introduction: Ebola virus disease (EVD) is a disease of humans and other primates caused by Ebola viruses. The most widespread epidemic of EVD in history occurred recently in several West African countries. The burden and outcome of EVD in pregnant women remains uncertain. There are few reports to date on maternal and fetal outcomes among pregnant women with EVD, hence the justification for this comprehensive review of these published studies.
Materials and Methods: Published literature in Englishthat reported on maternal and or fetal outcome among pregnant women with EVD up to May 2016 were searched in electronic databases (Google Scholar, Medline, Embase, PubMed, AJOL, and Scopus). Studies that did not meet the inclusion criteria were excluded. We extracted the following variables from each study: Geographical location, year of the study, settings of the study, participants, maternal and fetal outcome.
Results: A total of 12 studies reported on 108 pregnant women and 110 fetal outcomes. Six of the studies were case reports, three retrospective studies, two cross-sectional studies, and one was a technical report. There were 91 (84.3%) deaths out of the 108 pregnant women, while only one (0.9%) fetal survival was reported out of 110. The survival rate among the 15 patients that had spontaneous abortion/stillbirth or induced delivery was 100%.
Conclusion: There was a poor maternal and fetal outcome among pregnant women with EVD, and fetal evacuation significantly improves maternal survival.

Keywords: Africa; Ebola; fetal; maternal; outcome


How to cite this article:
Garba I, Dattijo LM, Habib AG. Ebola virus disease and pregnancy outcome: A review of the literature. Trop J Obstet Gynaecol 2017;34:6-10

How to cite this URL:
Garba I, Dattijo LM, Habib AG. Ebola virus disease and pregnancy outcome: A review of the literature. Trop J Obstet Gynaecol [serial online] 2017 [cited 2017 Oct 23];34:6-10. Available from: http://www.tjogonline.com/text.asp?2017/34/1/6/207089


  Introduction Top


Ebola virus disease (EVD) is a disease of public health importance that affect humans and other primates which is caused byEbola viruses. The causative agent of Ebola is an RNA virus of the family Filoviridae and genus Ebola virus. Ebola virus has five different strains: Zaire Ebolavirus (EBOV), Tai Forest Ebola virus (TAFV), Sudan Ebola virus (SUDV), Reston Ebola virus (RESTV), and Bundibugyo Ebola virus (BDBV) and all are pathogenic to humans, except for RESTV.[1] However, the vast majority of past Ebola outbreaks in humans are with EBOV, BDBV, and SUDV.[2]

The disease was first identified in 1976 during two simultaneous outbreaks in sub-Saharan Africa, one in Nzara and the other in Yambuku, a village near the Ebola River, from which the disease takes its name.[3] Between 1976 and 2013, there were 24 outbreaks. The 2014 Ebola virus disease (EVD) epidemic was the 24th outbreak, described as the largest, longest, and most complex, killing more people than all previous Ebola outbreaks combined.[4] Several West African countries were affected, primarily Guinea, Liberia, Sierra Leone with secondary cases in Mali, Nigeria, Senegal, Spain, and the United States.[5] Fatality in cases with known outcomes is 70.8%,[6] similar to that of past epidemics.[7]

Ebola virus is transmitted among humans through close and direct physical contact with body fluids from a symptomatic individual. In Africa, the caregiver role of women both in domestic and hospital settings put them at a higher risk of acquiring the infection. Poor infection prevention practices at antenatal clinics was said to be the reason for the disproportionate increase in infection among pregnant women in the 1976 Zaire Ebola outbreak rather than a biological consequence of pregnancy.[8] This is supported by epidemiological data from a recent epidemic, which demonstrated the equal distribution of EVD between the sexes.[9] A high Ebola virus load was shown in the amniotic fluid of two pregnant women, and in one of these cases, it was after viral clearance from blood in the convalescent phase.[10] Therefore, it is likely that fetal infection occurs through the placenta. It is not known if a mother can infect her baby with ebola virus through breast milk. However, EBV was found in breast milk as long as 40 days after the patient became asymptomatic and the virus was no longer present in blood,[11] suggesting that babies born to EVD survivors may also be at significant risk.

The burden of EVD in pregnant women is unknown due to the low numbers of pregnant women affected and limitations in data collection during the previous outbreaks. There are very few studies to date reporting on maternal and fetal outcomes among pregnant women with EVD, hence the justification for this comprehensive review of these published studies.


  Materials and Methods Top


We considered all published papers in English that reported maternal and or fetal outcome among pregnant women diagnosed with Ebola virus disease up to January 2016. Electronic databases (Google Scholar, Medline, Embase, PubMed, AJOL, and Scopus) were searched. Reference lists of selected studies were also checked for other potentially relevant studies. Keywords used in the search included: Ebola virus disease, Ebola hemorrhagic fever, pregnancy, fetal death, fetal outcome, maternal mortality, maternal outcome.

Two authors independently reviewed the studies and extracted the information. Areas of disagreements were resolved by discussion and consensus.

From our search, 56 studies were found, 47 of which were excluded because they did not meet the inclusion criteria. Extracted data were imputed into SPSS version 16 and analyzed.

We extracted the following variables from each study: geographical location, year of the study, settings of the study, participants, maternal and fetal outcome.


  Results Top


Twelve studies were found that reported on maternal and or fetal outcome among pregnant women with EVD. Among these 12 studies, there were five case reports, three retrospective studies, two cross-sectional studies, and one technical report [Table 1]. Countries covered by the studies include DRC, Liberia, Sierra Leone, Guinea, and Uganda.
Table 1: A summary of studies reporting pregnancy outcome in EVD

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Out of the 108 pregnant women reported in the studies reviewed, there were 91 (84.3%) deaths. The survival rate among the 15 patients that had spontaneous abortion/stillbirth or induced delivery was 100%. In one study, no pregnant woman was reported, but one of the patients was reported to have a miscarriage before admission. While in another study, a case of Ebola RNA negative mother with a history of contact who was delivered of EVD positive baby was reported. Therefore, a total of 110 fetal outcomes were reported out of which 52 (47.3%) from the 1976 Zaire outbreak died undelivered. Of the remaining 58 reported fetal outcomes, 31 (53.4%) were spontaneous abortions, 12 (20.7%) were stillbirths, one (1.7%) was a perinatal death, while 13 (22.4%) were neonatal deaths. There was only one reported fetal survival 1 (1.7%). The overall survival rate among the 110 reported fetal outcomes is therefore 0.9%. One study reported a mortality rate of 70% among non-pregnant women.


  Discussion Top


There are few studies that report the outcome of EBV infection in pregnant women. Here, we report a comprehensive review of the published literature on maternal and fetal outcome among ebola virus disease patients. We found a maternal mortality rate of 84.3%, while of the 58 reported fetal outcomes there was only 0.9% survival rate. Most of the studies were case reports.

Several infectious diseases, such as hepatitis, tuberculosis, and malariahave been reported to be severe in pregnant than non-pregnant women.[23],[24] Pregnant women infected with Ebola more often have serious complications, such as hemorrhagic and neurologic sequelae, than do non-pregnant patients.[25] Similar trends have been documented among pregnant women with Lassa fever. In fact, the first reported case of Lassa fever was described in a pregnant patient, and case fatality rate was higher particularly in the third trimester than for non-pregnant women. However, this is in contrast to EVD where mortality is reported to be high in all trimesters of pregnancies.[12],[25],[26] Also, mothers with Lassa fever improved rapidly after induced/spontaneous abortion or normal delivery.[26] Similarly, in this review there were 15 reported maternal survivals following a fetal loss.

Similar to what we found, a high frequency of abortion has been observed during infection with other hemorrhagic fevers, such as Lassa fever.[26] We also noted all the reported live deliveries died during the neonatal period; however, it is not clear whether these deaths were EVD related or resulted from the many other causes of high infant mortality recognized in resource-poor countries. In EVD, several factors such as pyrexia, intravascular coagulopathy, and EBV infection in fetuses may explain this high incidence of abortions.

Although pregnant women are not immunosuppressed in the real sense of the word, immunologic changes of pregnancy may induce a state of increased vulnerability to certain intracellular pathogens. This results from a shift from cell-mediated immunity toward humoral immunity. This phenomenon is often referred to as the Th1-Th2 shift of pregnancy and is likely to contribute to maternal tolerance of the fetus by suppressing the antifetal cell-mediated immune response. However, these immunological changes could may make the placenta a preferred site for viral replication, and it also helps explain so as to why illness and death increase during pregnancy and improvement is observed after pregnancy ends.

Knowledge about the novel and emerging infections in pregnancy is limited compared to common infectious diseases. Such lack of knowledge causes concern, given that an altered response to infectious diseases during pregnancy may require altered responses to emerging infectious disease threats. During outbreaks, public health policy and practice and the implications for clinical care rarely consider the unique issues of pregnancy and the newborn until very late.[27] For example, during the early stages of the H1N1 pandemic, there were no clinical guidelines or special recommendations for pregnant women until it was recognized that pregnant women had a poorer prognosis than non-pregnant adults.[28],[29] This has also been observed during the early days of HIV epidemics. In the recent West African Ebola outbreaks because of the fear of transmission and the perception that pregnant women and infant born to EVD women have a low chance of survival, most pregnant women with suspected Ebola were turned away from healthcare facilities.[30] However, there is now supporting evidence that shows the high efficacy of simple supportive management approaches such as fluid resuscitation even in the absence of specific antiviral treatment.[31],[32],[33] In some reports survival rates can be as high as 70% to 80%.[34]

Compared with what is known about common disease threats, knowledge about currently recognized emerging infectious diseases is quite limited. Because the effects of emerging infections in pregnant women might remarkably be different from that of the general population, pregnancy needs to be considered a potential risk for disease vulnerability as well as the associated morbidity and mortality. Unfortunately, pregnancy issues are often not usually taken into consideration in outbreak investigations, prospective studies, or emergency preparedness planning.


  Conclusion Top


There are few published reports on maternal and perinatal outcomes among pregnant women. Almost all the reports showed poor maternal and perinatal outcomes. There is a need for maternal health considerations in outbreak investigations and management of emerging and re-emerging infections like EVD for a more inclusive description of the course and effect of the disease in sub-saharan Africa.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

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