COVID-19 in pregnancy

In May 2020, the Royal College of Obstetricians and Gynaecologists (RCOG) and the Royal College of Midwives (RCM) reported the results from a UK Obstetric Surveillance System (UKOSS) study of 427 pregnant women and their babies.[8] This study showed that 4.9 pregnant women per 1000 were admitted to hospital with COVID-19 and 1 in 10 of these required intensive care.[9]

The findings of this study support earlier suggestions that pregnant women are not at greater risk of severe illness than non-pregnant women. Similar risk factors also apply: women in the study were more likely to be admitted to hospital if they were older, overweight or obese, or had pre-existing conditions such as diabetes or high blood pressure.[8] Five women died but it is not yet clear whether the virus was the cause of death.[8] Since the majority of women who became severely ill were in their third trimester of pregnancy, the RCOG and RCM emphasised the importance of social distancing for this group.[8] The study also found that 55% of pregnant women admitted to hospital with COVID-19 were from a black or other minority ethnic (BAME) background, which is far higher than the percentage of BAME women in the UK population. Speaking for the RCOG, Dr Christine Ekechi stated that it is of "great concern" that over half of those admitted to hospital were from a BAME background, that there were already "persisting vulnerabilities" for this group, and that the RCOG was updating guidance to lower the threshold to review, admit and consider escalation of care for pregnant women of BAME background.[8] The UK Audit and Research Collaborative in Obstetrics and Gynaecology undertook a UK wide evaluation of women's health care services in response to the acute phase of the pandemic, finding more work was required in the long term for the provision of both maternity and gynaecology oncology services.[10][11]

A case series of 43 women from New York who tested positive for COVID-19 showed similar patterns to non-pregnant adults: 86% had mild disease, 9.3% had severe disease and 4.7% developed critical disease.[12] Another study found the cases of COVID-19 pneumonia in pregnancy were milder and with good recovery.[13]

A study of 9 infected women at the third trimester of pregnancy from Wuhan, China showed that they showed fever (in six of nine patients), muscle pain (in three), sore throat (in two) and malaise (in two). Fetal distress was reported in two. None of the women developed severe COVID-19 pneumonia or died. All of them had live birth pregnancies and no severe neonatal asphyxia was observed. The samples of breast milk, amniotic fluid, cord blood and neonatal throat swab were tested for SARS-CoV-2, and all results were negative.[5]

In another study on 15 pregnant women, majority of the patients presented with fever and cough, while laboratory tests yielded lymphocytopenia in 12 patients.[13] Computed tomography findings of these patients were consistent with previous reports of non-pregnant patients, consisting of ground-glass opacities at early stage.[13][14] Follow-up images after delivery showed no progression of pneumonia.[13]

Media reports indicate that over 100 women with COVID-19 might have delivered, and in March 2020, no maternal deaths were reported.[15] In April 2020, a 27-year old pregnant woman at 30 weeks of pregnancy died in Iran; her death may have been caused by COVID-19.[16]

The RCOG advised in early April 2020 that because pregnancy is a hypercoagulable state and that people admitted to hospital with COVID-19 are also hypercoagulable, infection with COVID-19 could increase the risk of venous thromboembolism and that this risk could be compounded by reduced mobility due to self-isolating.[17] Their guidelines thus advise that any pregnant woman admitted to hospital with a COVID-19 infection should receive at least 10 days of prophylactic low-molecular-weight heparin after being discharged from the hospital.[18]

Recently, the International Registry of Coronavirus Exposure in Pregnancy (IRCEP) was launched as a collaboration between Pregistry and the Harvard TH Chan School of Public Health.[19]

Pregistry also has three other studies;

COVID-19 Vaccines International Pregnancy Exposure Registry (C-VIPER) (NCT04705116, EUPAS39096). The objective of this study is to assess the effect of COVID-19 vaccination during pregnancy on obstetric, perinatal, and postnatal outcomes./

COVID-19 International Drug Pregnancy Registry (COVID-PR). (NCT05013632, EUPAS42517) The objective of this study is to assess the effect of specific newly developed COVID-19 medications during pregnancy on obstetric, perinatal, and postnatal outcomes. https://covid-pr.pregistry.com/

Pregistry International Pregnancy Exposures Registry (PIPER) (NCT05352256, EUPAS46841) To provide early signal of risk after prenatal exposure to medications and vaccines and to define their boundary of safety.

There are limited data concerning the implications of COVID-19 infections for labour.[4] Al-kuraishy et al. reported that COVID-19 in pregnancy may increase the risk of preterm labour. Preterm delivery is regarded as a chief outcome of COVID-19 pneumonia during pregnancy.[17] The UKOSS study found that median gestational age at birth was 38 weeks and that 27% of women studied had preterm births. Of these, 47% were interventions given because of risk to the mother's health and 15% were because of risk to the foetus.[6]

There are currently no data to suggest increased risk of miscarriage or early pregnancy loss in relation to COVID-19.[17]

Early studies indicated no evidence for vertical transmission of COVID-19 from mother to child in late pregnancy[5] but more recent reports indicate that vertical transmission may occur in some cases.[20][21][22]

Early research found two neonates to be infected with COVID-19 but it was considered that transmission likely occurred in the postnatal period.[23]

It is also to be noted that the human placenta expresses factors that are important in the pathogenesis of COVID-19.[24]

More recent small-scale findings indicate that vertical transmission may be possible. One infant girl born to a mother with COVID-19 had elevated IgM levels two hours after birth, suggesting that she had been infected in utero and supporting the possibility of vertical transmission in some cases.[20] A small study involving 6 confirmed COVID-19 mothers showed no indication of SARS-CoV-2 in their newborns' throats or serum but antibodies were present in neonatal blood sera samples, including IgM in two of the infants.[21] This is not usually passed from mother to fetus so further research is required to know whether the virus crossed the placenta or whether placentas of women in the study were damaged or abnormal.[21]

A set of triplets were born prematurely with COVID-19 at the Ignacio Morones Prieto Central Hospital in San Luis Potosí, Mexico, on June 17, 2020. Both parents tested negative and the children were reported stable.[25]

The CDC now encourages pregnant women to get COVID-19 vaccines.

The United Nations Population Fund (UNFPA) recommends seven general measures for all episodes of contact with maternity patients undergoing care:[30]

1. Ensure staff and patient access to clean hand washing facilities prior to facility entry.
2. Have basic soap at each health facility wash station along with a clean cloth or disposable hand towels for hand drying.
3. If midwives provide direct patient care, they must frequently wash their hands with soap and water for at least 20 seconds each time. This must happen before every new woman is seen and again before their physical exam. Midwives should wash again immediately after the exam and again once the patient leaves. Washing should also occur after cleaning surfaces and coughing or sneezing. Hand sanitizer can also be applied especially if clean water is unavailable.[30]
4. Avoid touching the mouth, nose or eyes.
5. Staff and patients should be advised to cough into a tissue or their elbow and wash hands afterwards.
6. Midwives should keep a social distance of at least 2 arms lengths during any clinical visit. As long as hand washing is performed before and after the physical exam women without suspected or confirmed COVID-19, the physical exam and patient contact should continue as usual, if hand washing is performed before and after.[30]
7. Spray surfaces used by patients and staff with bleach or another. Be sure to wipe down the surface with a paper towel or clean cloth in between patients and wash hands.[30]
8. Childbirth, antenatal care and postnatal care are carried out by midwives and represent some of the most important health care services in the women's health sector and are directly linked to mortality and morbidity rates.[30]
9. It is essential that the SRMNAH workforce, including midwives, is included in the emergency response and distribution plans to receive sufficient PPE and orientation how to use PPE correctly.[30]
10. Since midwifery care is continuing to be an essential service that women must be able to access it is very important that midwives receive support, mentoring and orientation how to re-organise services to keep providing quality care (i.e. respecting the public health advice of at least 2m between women, as few as possible midwives looking after one woman (few staff in the room), hand washing hygiene).[30]
11. Midwives must receive evidence-based information that they can protect themselves from contracting COVID-19 when caring for a symptomatic woman, or from a woman who was exposed to a COVID-19 positive person.[30]
12. Midwives play an essential role in reducing stigma and battling the spreading belief that health facilities are to be avoided to stay healthy/ not contract COVID-19.[30]
13. It can be expected that the reorganisation/ removal of funds from sectors that midwives work in, will directly be linked to an upward trend of maternal and newborn morbidity and mortality pushing countries further away from their SDG targets].[30]

The RCOG and RCM strongly advise that antenatal and postnatal care should be regarded as essential, and that "pregnant women will continue to need at least as much support, advice, care and guidance in relation to pregnancy, childbirth and early parenthood as before".[17]

In May 2020, a spokesperson for the RCOG suggested that black and other minority ethnic women should be warned that they may have greater risk of complications from the virus and should be advised to seek help early if concerned.[8] Moreover, healthcare professionals should be aware of the increased risk and have a lower threshold to review, admit and escalate care provided to women of BAME background.[6]

To minimise the risk of infection, the RCOG and RCM advise that some appointments may be conducted remotely via teleconferencing or videoconferencing.[17] A survey conducted in Shanghai among pregnant women in different trimesters of pregnancy identified a strong demand for online access to health information and services.[31] Women expecting their first baby were more willing to have online consultation and guidance than who had previously given birth.[31]

The RCOG and RCM recommend that in-person appointments be deferred by 7 days after the start of symptoms of COVID-19 or 14 days if another person in the household has symptoms.[17] Where in-person appointments are required, pregnant patients with symptoms or confirmed COVID-19 who require obstetric care are advised to notify the hospital or clinic before they arrive in order for infection control to be put in place.[4][17]

Universal screening at the New York–Presbyterian Allen Hospital and Columbia University Irving Medical Center found that out of 215 pregnant patients, four (1.9%) had symptoms and were positive for COVID-19 and 29 (13.7%) were asymptomatic but tested positive for the virus.[32] Fever subsequently developed in three asymptomatic patients. One patient who had tested negative subsequently became symptomatic postpartum and tested positive three days after the initial negative test.[32] The doctors conducting the screening recommended that in order to reduce infection and allocate PPE, due to high numbers of patients presenting as asymptomatic, universal screening of pregnant patients should be conducted.[32]

In the UK, official guidelines state that women should be permitted and encouraged to have one asymptomatic birth partner present with them during their labour and birth.[17]

There is no evidence regarding if there is vaginal shedding of the virus, so the mode of birth (vaginal or caesarean) should be discussed with the woman in labour and take into consideration her preferences if there are no other contraindications.[15][17] If a patient has a scheduled elective caesarean birth or a planned induction of labour, an individual assessment should consider whether it is safe to delay the procedure to minimise the risk of infecting others.[17] Products of conception, such as the placenta, amnion etc. have not been shown to have congenital coronavirus exposure or infection, and do not pose risk of coronavirus infection.[33]

The RCOG and the RCM recommend that epidurals should be recommended to patients with confirmed or suspected COVID-19 in labour so that the need for general anaesthesia is minimised if urgent intervention for birth is required.[17] They also suggest that women with suspected or confirmed COVID-19 should have continuous electronic fetal monitoring.[17] The use of birthing pools is not recommended for suspected or confirmed cases of COVID-19 due to the risk of infection via faeces.[17]

An infographic from the World Health Organization on COVID-19 preventive measures to be taken while breastfeeding

In the UK, official recommendations state that precautionary separation of a mother and a healthy baby should not be undertaken lightly and that they should be kept together in the postpartum period where neonatal care is not required.[17] According to UN Population Fund, women are encouraged to breastfeed as normal to the extent possible in consultation with the healthcare provider.[33]

Literature from China recommended separation of infected mothers from babies for 14 days.[17] In the US there is also the recommendation that newborns and mothers should be temporarily separated until transmission-based precautions are discontinued, and that where this is not possible the newborn should be kept 2 metres away from the mother.[4]

Besides, some current guidelines include that mothers with COVID-19 should be encouraged to breastfeed if they are able, but should wear personal protective equipment to do so. This suggestion has been made, given that neonatal infection is generally mild and often asymptomatic, and the benefits of breastfeeding may outweigh the potential transmission risk.[34]

UNFPA recommends it is critical that all women have access to safe birth, the continuum of antenatal and postnatal care, including screening tests according to national guidelines and standards, especially in epicenters of the pandemic, where access to services for pregnant women, women in labour and delivery, and lactating women is negatively impacted.[35]