Epidemiology of zero-dose among children aged 12-35 months in Ethiopia: Burden, correlates and spatial patterns; Evidence from a 2025 national survey
Based on a 2025 national survey in Ethiopia, approximately 20.6% of children aged 12–35 months remain zero-dose, with significant geographic clustering in eastern and south-central regions driven by factors such as inadequate antenatal care, unimproved water sources, and low caregiver perception of vaccination importance.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of a preprint that has not been peer-reviewed. It is not medical advice. Do not make health decisions based on this content. Read full disclaimer
Every child deserves a shield against diseases that can sicken or kill them, and for decades, public health workers have relied on a simple, powerful tool: the first dose of a vaccine that protects against diphtheria, tetanus, and whooping cough. When a child receives this initial shot, they enter the world of immunization. But when a child never receives it, they are left completely exposed. These children are known as "zero-dose" children. They are not just missing one appointment; they are often the most isolated, the hardest to reach, and the most vulnerable. Understanding where these children live and why their families have not brought them to a clinic is the key to closing the gap in global health. If we cannot find them, we cannot protect them, and the diseases they are meant to be shielded from can spread to others.
In 2025, researchers set out to find these missing children across Ethiopia, a vast and diverse nation where geography and access to services vary wildly. They did not look at just the youngest babies, but at children between the ages of one and three years old, a group that has already passed the typical window for their first shots. By walking into thousands of homes and asking mothers and fathers about their children's health records, the team built a clear picture of who was left behind. They found that roughly one in five children in this age group had never received that critical first dose. This is not a small number; it represents a massive, unmet need that persists even after a child has turned one.
The study revealed that this burden is not spread evenly across the country. Instead, it clusters in specific areas, creating pockets of high risk. The researchers mapped these patterns and discovered that the highest concentrations of unvaccinated children are found in the eastern and south-central parts of the country, particularly in regions like Somali and Oromia. In some of these communities, more than a third of the children had missed their first shot, while in the capital city, Addis Ababa, the number was less than one percent. This stark contrast shows that a national average can hide a local crisis; a country might look like it is doing well overall, while specific neighborhoods are being left behind.
To understand why these children were missed, the researchers looked closely at the lives of their families. They found that the decision to vaccinate is deeply tied to a mother's own experience with the health system. Children whose mothers had never visited a doctor for prenatal care during pregnancy were far more likely to be unvaccinated. Similarly, families who did not consider vaccines to be very important were significantly more likely to have missed children. The study also pointed to the basics of daily life: children living in homes without access to clean, improved drinking water were much more likely to be zero-dose. This suggests that the barriers to vaccination are often the same barriers that prevent families from accessing clean water or regular medical care.
Interestingly, the researchers found that simply living far from a clinic was not the only story. While longer walking times to health facilities were associated with higher rates of missed vaccinations, the link was not as strong as they expected. This implies that distance alone does not explain everything; the way families interact with the health system and their beliefs about medicine matter just as much. The study also noted that in some areas, local conflicts and the way families make decisions about a child's health played a role, though these factors were complex and varied from place to place.
The team used advanced mapping techniques to predict where unvaccinated children might be living in areas they had not visited. These maps showed that the problem extends beyond the specific villages they surveyed, stretching across the eastern and south-central landscapes of the country. The findings confirm that the challenge of reaching zero-dose children is not just about sending more trucks to remote areas; it is about understanding the specific reasons families in those areas are not coming forward. Whether it is a lack of trust, a lack of information, or a lack of access to basic services like clean water, the solution must be tailored to the community.
For health workers and policymakers, this research provides a roadmap. It tells them exactly where to focus their efforts: the eastern and south-central regions, and specifically the communities where mothers have not seen a doctor during pregnancy or where clean water is scarce. It suggests that reaching these children requires more than just a vaccine; it requires building trust, improving basic living conditions, and ensuring that mothers feel supported by the health system long before their child is born. The study does not offer a magic bullet, but it offers something perhaps more valuable: a clear, honest look at where the gaps are, so that no child is left in the dark.
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