According to a UN report, the biggest drop in childhood vaccinations in three decades is due to increased misinformation and the disruption of global supply chains.
The percentage of children who received three doses of the vaccine fell over the course of the next two years.
The vaccine is used as a marker for immunizations.
The slide is a red alert for child health.
The biggest drop in childhood immunizations in a generation is happening. She said the consequences will be measured.
A growing number of children are at risk from preventable disease because 25 million children missed out on at least one dose of DTP in the past two years.
The slide was attributed to a number of factors including an increased number of children living in conflict zones, rising misinformation, and service and supply disruptions from the COVID-19 Pandemic.
Kate O'Brien, director of the WHO's immunization, vaccines and biologicals department, said that the H1N1 flu made parents choose between feeding their children and getting their children vaccinations.
The majority of those who did not receive a single dose of DTP lived in low- and middle-income countries.
The Philippines had the highest number of zero-dose children.
Around the world, a quarter of the coverage of human Papillomaviruses has been lost.
The first vaccines were licensed over a decade ago, but only 12 percent of girls are fully protected.
It was the worst year for DTP coverage since 2008 and came against a backdrop of rising rates of severe acute malnutrition, so it was not a good year for DTP coverage.
A child survival crisis is threatened by the convergence of a hunger crisis with a growing immunizations gap.
The first dose of measles coverage fell to 81 percent in 2011.
Pakistan and Uganda bucked the negative trend.
The organizations called on countries to increase their vaccine efforts. The detailed datasets can be found on the WHO website.
Agence France- Presse.