Risk assessment for children (ie, those aged under 18 years) has been a contentious and polarising issue during the pandemic. Aotearoa New Zealand has generally avoided engaging with these controversies because its elimination strategy significantly reduced impacts on children from both Covid-19 infection and the control measures used to contain it. Currently the country is experiencing its first Delta-variant outbreak at a time when its children are still largely unvaccinated and immunologically naïve to SARS-CoV-2.
Our analysis uses a structured approach to consider the proper place of children in pandemic decisions. The Precautionary Principle is often invoked without definition or explanation of its implications. To address this gap, we identify four key elements of the Precautionary Principle and explore their relevance to children in the pandemic, guiding strategic and operational decisions in the presence of high uncertainty. We provide a framework for comprehensive Health Impact Assessments to ensure that direct and indirect impacts upon children are taken into account in major policy decisions. We use the example of Aotearoa New Zealand as a country at the brink of key decisions about its pandemic strategy and its child population.
Children and the SARS-CoV-2 pandemic
The initial perception that children experienced minimal illness from Covid-19 infection has evolved into a more complex picture that includes evidence of significant harms to children. These harms may be direct (arising from being a case) or indirect (arising from community transmission with impacts on non-Covid healthcare and health equity). Added to these harms from the virus itself are the impacts of the pandemic response (ie, control measures); again, these harms may be direct (educational disruption from school closures) or indirect (increased prevalence of child poverty when employment is insecure).
The wellbeing of children should be central to pandemic policy decisions. In Aotearoa New Zealand, similarly to other Indigenous cultures, Māori health perspectives support individual wellbeing but there are also beliefs around collective wellbeing that are linked to Māori self-determination.1 Tamariki Māori (Māori children) must not be seen alone in matters of health and wellbeing, but always centred in the context of their whānau/family. They are seen as gifts from the atua (spiritual beings) and from the tipuna (ancestors), requiring societies to provide nurturing environments to support them to achieve their potential.2
This collective model of wellbeing aligns closely with a population health approach,3 providing the basis for an integrated assessment of the linked effects of the pandemic on children, families, and communities.4 Decisions need to be centred on child wellbeing to protect children from direct and indirect harms of the pandemic and the response. Jurisdictions should avoid using children as a means to an end such as population immunity to Covid-19 whether via vaccine or disease.5
The Precautionary Principle as a decision framework for children and the pandemic
The Precautionary Principle is a decision framework intended for situations of high uncertainty where decisions have significant impacts. Our analysis of children’s place in the pandemic is structured around four key elements of the Precautionary Principle:6
1. Take preventive action until risks are better understood;
2. Ensure that the burden of proof rests with the proponents of risk;
3. Explore alternatives to the risk; and
4. Use participatory approaches to decision-making.
We consider the implications of each principle for Covid-19 pandemic decisions.
Principle 1: Take preventive action while novel risks are being characterised and quantified
By definition an elimination strategy prevents more transmission, illness, disease complications, and death from Covid-19 than other pandemic strategies, simply because it prevents more cases. But because having no community transmission allows for fewer pandemic restrictions, elimination has also prevented many of the adverse consequences of lockdowns and overwhelmed health systems experienced by jurisdictions attempting mitigation or suppression.7 8 An elimination strategy provides time to learn from the experience of other jurisdictions, implementing policies that have been shown to be successful elsewhere while avoiding policy failures. Two examples where Aotearoa has learned from international experience include evidence about vaccination safety and efficacy in children, and observing the stark health inequities experienced by children in marginalised populations.
Principle 2: Ensure the burden of proof rests with the proponents of risk
Proponents of Covid-19 endemicity (‘living with the virus’) have a responsibility to be transparent regarding the ongoing health and social costs of this strategy at a population level. Endemicity is often confused with mild disease and normal life, but many common endemic diseases (eg, malaria) cause high morbidity and mortality in children. Poliomyelitis, another disease that was endemic in most of the world until recently, is asymptomatic in around 70% of infections and only rarely causes paralysis. But tolerating endemicity is not an accepted strategy for polio because the high transmissibility of this infection (R0 around 109) results in large numbers of cases, leading to a high and unacceptable health burden in unvaccinated populations.
The same phenomenon can be seen in Covid-19 outbreaks; when community transmission is high the absolute numbers of paediatric hospitalisations and of serious complications such as multisystem inflammatory syndrome of childhood (MIS-C)10 are likewise high and can overwhelm health service capacity.
Similarly, the prevalence and duration of ongoing post-acute symptoms (eg, Long Covid) in children is yet to be clearly established but emerging findings are concerning.11 12 Life-altering post-acute effects have been observed in most childhood infectious diseases and in both of the previous coronavirus pandemics.13 Decision-makers advocating against the use of Covid-19 vaccines or other preventive measures for children need to demonstrate evidence for beliefs that the SARS-CoV-2 virus will be more benign compared with these other infections.
Principle 3: Explore alternatives to the risk
The three main strategies for a pandemic of moderate-to-high transmissibility and severity are elimination, mitigation, and suppression.8 14 These approaches are described in Table 1, while the impacts of these Covid-19 strategies on children are compared in Table 2.
Table 1. The three main Covid-19 pandemic strategies: elimination, mitigation, and suppression.
Pandemic control strategies
Pandemic options that are enacted at the country level are defined by their aims.8 14 Elimination aims to stop community transmission of the SARS-CoV-2 virus for prolonged periods within a specified country or region. Mitigation is a form of control that accepts transmission at a predetermined, manageable level, e.g. to avoid overwhelming the health system in an influenza pandemic. Suppression aims to keep transmission at a low level to minimise adverse health effects, as for HIV/AIDS. Elimination strategies have been widely used in the Asia-Pacific region for control of Covid-19.15
How is Covid-19 elimination experienced ‘on the ground’?
Elimination differs from mitigation or suppression in ways that go beyond differences in case numbers. Elimination starts from and returns to a baseline in which children experience relatively few restrictions in their daily lives, although stringent restrictions at the borders are necessary. Mitigation and suppression approaches allow more freedom to travel but accept a continuous and fluctuating level of new cases, hospitalisations, and deaths.
Mitigation and suppression approaches require ongoing application of controls such as school closures and cancellation of routine healthcare to prevent health systems from becoming overwhelmed during peak transmission periods. Elimination requires a high stringency of outbreak control applied at an early phase of the epidemic curve, but once elimination is regained, controls are lifted. Paradoxically, jurisdictions pursuing Covid-19 elimination have spent less time under lockdown than jurisdictions aiming for mitigation or suppression (Figure 1).
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Table 2
Comparison of impacts of the pandemic and the response on children under different pandemic strategy options.
Impacts on children
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Jurisdictions with a mitigation or suppression* strategy
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Jurisdictions with an elimination strategy
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Direct impacts of Covid-19 disease
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• Although severe acute infections in children are fortunately rare, substantial numbers of children experience complications in places where community transmission is high.
• Severe illness may require hospitalisation and intensive care admission for mechanical ventilation
• Children from population groups that are historically and currently disadvantaged, and children experiencing socioeconomic disadvantage or comorbidities including obesity are at increased risk of severe illness. Incidence, hospitalisations, and mortality are strongly patterned by ethnicity and deprivation (see ‘Inequities’ below)
• Rarely, severe complications include multisystem inflammatory syndrome (MIS-C)10
• Post-acute impacts include persisting symptoms such as fatigue and cognitive difficulties (e.g. Long Covid)11 with pathological inflammatory changes at the tissue level observed in vital organs such as the brain.12 The duration of persisting symptoms, incidence, and long-term impacts are not yet fully established but population impact may be substantial given the large number of children infected
• According to CDC reports, Covid-19-associated paediatric hospitalisations over six month period from October 2020 to April 2021 were 2.5 to 3.0 times higher than influenza-associated hospitalisation rates across three consecutive seasons (2017 – 2018; 2018-2019; and 2019 – 2020)16
• CDC data for the US estimate that there have been around 5.5 million confirmed cases in children; 791 children have died of Covid-19 to date.
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• Paediatric cases are rare
• In NZ, since the onset of the pandemic there have been 1612 Covid-19 cases in the 0-19 years age group (including cases identified in the community and in the border quarantine system). To date there have been no fatal paediatric cases of Covid-19 in NZ.
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Indirect impacts of Covid-19 disease
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• Children may experience bereavement, loss of a primary caregiver and/or secondary caregiver, isolation from caregivers, and quarantine
• Infected children may experience guilt (particularly if they are identified as a source case) and/or stigma, and anxiety for loved ones
• In jurisdictions with high levels of community transmission, overwhelm of healthcare systems due to acute Covid-19 cases may result in disruption to routine paediatric healthcare delivery
• Covid-19 infection in pregnant people is associated with increased risk of preterm birth, compounding existing health and ethnicity-based inequities in birth outcomes
• Globally, it is estimated that over a million children have lost a primary caregiver to Covid-19. Losing a caregiver is an Adverse Childhood Experience (ACE) associated with multiple poor outcomes for children including severe mental distress, lower educational attainment, and experiencing physical and sexual violence.17
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• Adult cases are rare, minimising the impacts on children of illness or death in the family.
• The cumulative total of confirmed Covid-19 cases in NZ is currently 1287 per million population; since the onset of the pandemic there have been a total of 6594 cases and 28 deaths. (By comparison, the US and UK have each experienced >130 000 confirmed cases per million population).
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Direct impacts of the pandemic response
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• The Covid-19 pandemic has been described as “the largest disruption to education in history”, affecting around 94% of the world’s children.18
• Prolonged school closures result in educational harms and compound existing educational inequities
• Prolonged school closures also lead to social isolation, separation from peers and supportive adults, counselling, child protection safety nets, school-based meals, and health services delivered at school including immunisation and sexual health programmes
• Paediatric Covid-19 vaccines have excellent safety and efficacy profiles to date. The most serious adverse effect of vaccination appears to be myocarditis which is rare and self-limiting, with better outcomes compared with myocarditis due to Covid-19 disease.
• Imposing or lifting public health and social control measures has impacts on transmission of non-Covid infections. Impacts may include reduction of infections eg, seasonal influenza; but as jurisdictions transition to a greater dependence on Covid-19 vaccines and loosen physical distancing measures, the return and changing epidemiology of other infections may have large and unpredictable effects on population child health.
• Childhood immunisation programmes (ie, for non-Covid infections) can be adversely affected if infrastructure and staff are redirected to Covid vaccination.
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• Schools remain open for extended periods when community transmission is low or eliminated, minimising educational, health, developmental, and social harms from prolonged school closures.
• Elimination results in shorter time spent in lockdown than in jurisdictions using suppression or aiming for herd immunity. Children are able to socialise with older members of their wider family and community, supporting child wellbeing and interconnectedness.
• Vaccines: Effective prevention of community transmission will require most children to be vaccinated. Aotearoa NZ has commenced vaccination of the 12-15 year age group. The FDA has approved vaccination in the 5-11 year age group and the results of vaccine trials in children aged 6 months to 4 years are awaited;
• NZ’s high stringency lockdowns eliminated transmission of a large number of respiratory and other infections during the winter of 2020.19 As NZ transitions to a greater dependence on Covid-19 vaccines and loosens physical distancing measures, the return and changing epidemiology of other infections may have large and unpredictable effects on population child health. Loosening of border restrictions during 2021 resulted in a rapid resurgence of RSV infection.
• Childhood immunisation programmes (ie, for non-Covid infections) can be adversely affected if infrastructure and staff are redirected to Covid vaccination.
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Indirect impacts of the pandemic response
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• Prolonged lockdowns have been associated with high levels of economic hardship, causing additional impacts on wellbeing.7
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• Shorter lockdowns have a lower adverse impact on employment and other family-level determinants of child wellbeing.7
• Children may however be negatively impacted through geographic separation from family members overseas due to border restrictions.
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Health equity
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• The Covid-19 pandemic has widened pre-existing inequities over multiple domains.
• In countries with high levels of transmission, severity of disease is higher in children from low-income households and children with underlying chronic conditions.20 Covid-19 hospitalisations are also strongly patterned by ethnicity, with particularly high incidence rates in Indigenous populations.21
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• In jurisdictions like Aotearoa where widespread Covid-19 infections are likely to widen pre-existing health inequities, elimination is pro-equity in its aims. However, the Alert Level 4 lockdown of 2020 caused substantial hardship for low-income families. This additional hardship was predictable and could have been mitigated through effective policy.22
• Inequities in the pandemic response signal the need for policy design that is explicitly pro-equity.23 In Aotearoa for example, Te Tiriti o Waitangi/ The Treaty of Waitangi must be upheld in all aspects of the pandemic response.24–26
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* Note that with a suppression approach, particularly if applied rigorously (ie ‘tight suppression’) the direct and indirect effects of disease will be less, but the direct and indirect effects of the response may be increased |
Principle 4: Use participatory decision-making
The SARS-CoV-2 pandemic exacerbates existing structural inequalities and as noted in Table 2, these inequalities have had profound impacts on child wellbeing during the pandemic.
These findings are in keeping with known inequities in infectious disease incidence in Aotearoa27 and the catastrophic impacts of previous pandemics and epidemics for Māori. Uncontrolled community transmission in Aotearoa would very likely result in disproportionate hospitalisations of Māori and Pacific children, children from high deprivation backgrounds, and children with disabilities and comorbidities.26 28 Waves of Covid-19-positive child hospitalisations require strict infection control procedures and can exceed intensive care capacity, placing stress on already stretched health care workforce. Vaccine availability and uptake is also inequitable, further intensifying impacts on disadvantaged populations.
Those that carry the most risk of adverse impacts must have a say in policy decisions. Such decisions need a national conversation and transparent policy processes, ensuring that decisions reflect the views of children and their advocates. In particular it is critical to ensure that commercial determinants of health (eg, pressure from tourism or hospitality industries) are not the deciding factors in Covid-19 policy relating to children.